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Decimal Conversion

Decimal Conversion

Drill, Decimal & Fraction Table

Drill &
Fraction
Decimal
Drill &
Fraction
Decimal
Drill &
Fraction
Decimal
80
.0135
1/8
.1250
O
.3160
79
.0145
30
.1285
P
.3230
1/64
.0156
29
.1360
21/64
.3281
78
.0160
28
.1405
Q
.3320
77
.0180
9/64
.1406
R
.3390
76
.0200
27
.1440
11/32
.3438
75
.0210
26
.1470
S
.3480
74
.0225
25
.1495
T
.3580
73
.0240
24
.1520
23/64
.3594
72
.0250
23
.1540
U
.3680
71
.0260
5/32
.1562
3/8
.3750
70
.0280
22
.1570
V
.3770
69
.0292
21
.1590
W
.3860
68
.0310
20
.1610
25/64
.3906
1/32
.0312
19
.1660
X
.3970
67
.0320
18
.1695
Y
.4040
66
.0330
11/64
.1719
13/32
.4062
65
.0350
17
.1730
Z
.4130
64
.0360
16
.1770
27/64
.4219
63
.0370
15
.1800
7/16
.4375
62
.0380
14
.1820
29/64
.4531
61
.0390
13
.1850
15/32
.4688
60
.0400
3/16
.1875
31/64
.4844
59
.0410
12
.1890
1/2
.5000
58
.0420
11
.1910
33/64
.5156
57
.0430
10
.1935
17/32
.5312
56
.0465
9
.1960
35/64
.5469
3/64
.0469
8
.1990
9/16
.5625
55
.0520
7
.2010
37/64
.5781
54
.0550
13/64
.2031
19/32
.5938
53
.0595
6
.2040
39/64
.6094
1/16
.0625
5
.2055
5/8
.6250
52
.0635
4
.2090
41/64
.6406
51
.0670
3
.2130
21/32
.6562
50
.0700
7/32
.2188
43/64
.6719
49
.0730
2
.2210
11/16
.6875
48
.0760
1
.2280
45/64
.7031
5/64
.0781
A
.2340
23/32
.7188
47
.0785
15/64
.2344
47/64
.7344
46
.0810
B
.2380
3/4
.7500
45
.0820
C
.2420
49/64
.7656
44
.0860
D
.2460
25/32
.7812
43
.0890
1/4
.2500
51/64
.7969
42
.0935
E
.2500
13/16
.8125
3/32
.0938
F
.2570
53/64
.8281
41
.0960
G
.2610
27/32
.8438
40
.0980
17/64
.2656
55/64
.8594
39
.0995
H
.2660
7/8
.8750
38
.1015
I
.2720
57/64
.8906
37
.1040
J
.2770
29/32
.9062
36
.1065
K
.2810
59/64
.9219
7/64
.1094
9/32
.2812
15/16
.9375
35
.1100
L
.2900
61/64
.9531
34
.1110
M
.2950
31/32
.9688
33
.1130
19/64
.2669
63/64
.9844
32
.1160
N
.3020
1
1.000
31
.1200
5/16
.3125
 
 

Hi-Low Fastener

Hi-Low Fastener Inch

Hi-Low Fastener Inch

Hi-low is a high performance, duel lead thread forming screw for plastic & wood applications, designed with a unique high and low thread. The higher sharper thread has a steep flank angle for positive engagement, lower radial pressure and reduced boss failure. The screw is designed to increase you drive to strip out ratio improving your in-place fastener costs.
  • Reduce cracking, splitting and boss breakage
  • Increase pull-out strength
  • Lower driving, higher strip out torques

Hi-Low Fastener Inch

Hi-Low Fastener

Screw Size
High Thread Diameter
Low Thread Diameter
Point Diameter
Pilot Hole Diameter Flexural Modulus of Plastic
Pilot Hole Diameter Flexural Modulus of Plastic
Pilot Hole Thread Cutting Diameter Flexural Modulus of Plastic
 
D
B
P
Up to 200,000 P.S.I .
200,000-400,000 P.S.I.
200,000-400,000 P.S.I.
2-32
.084-.090
.069
.050-.058
.067
.070
.076
3-28
.095- .105
.078
.057- .065
.073
.078
.082
4-24
.105-.115
.086
.061-.070
.081
.086
.089
5-20
.119- .125
.100
.073- .082
.093
.995
.104
6-19
.135-.145
.108
.080-.090
.101
.110
.116
7-19
.148-.158
.130
.089- .100
.120
.125
.128
8-18
.160-.170
.130
.095-.105
.120
.128
.136
10-16
.185-.195
.145
.099-.110
.136
.144
.152
11-16
.198-.210
.150
.113- .125
.149
.156
.169
12-16
.210-.220
.167
.125-.137
.157
.166
.177
13-16
.220-.230
.180
.127-.139
.169
.180
.187
1/4-15
.250-.260
.200
.161-.175
.189
.201
.218
5/16-14
.307-.137
.250
.200-.212
.238
.250
.257
  • Description

    A thread forming screw with a double-lead, consisting of a low and a high thread. The lower thread varies in height from 1/3 to 1/2 that of the high thread, which is sharper and flatter than a standard thread.
  • Applications

    for use in plastic, nylon, wood or other low-density materials. Thread design reduces driving torques, enhances resistance to thread stripping, improves pullout strength and lessens risk of cracking the work piece.

Hi-low is a high performance, duel lead thread forming screw for plastic & wood applications, designed with a unique high and low thread. The higher sharper thread has a steep flank angle for positive engagement, lower radial pressure and reduced boss failure. The screw is designed to increase you drive to strip out ratio improving your in-place fastener costs.

Hi-Low Fastener Inch

 

Hi-Low Fastener

Screw Size

High Thread Diameter

Low Thread Diameter

Point Diameter

Pilot Hole Diameter Flexural Modulus of Plastic

Pilot Hole Diameter Flexural Modulus of Plastic

Pilot Hole Thread Cutting Diameter Flexural Modulus of Plastic

 
D
B
P
Up to 200,000 P.S.I .
200,000-400,000 P.S.I.
200,000-400,000 P.S.I.
2-32
.084-.090
.069
.050-.058
.067
.070
.076
3-28
.095- .105
.078
.057- .065
.073
.078
.082
4-24
.105-.115
.086
.061-.070
.081
.086
.089
5-20
.119- .125
.100
.073- .082
.093
.995
.104
6-19
.135-.145
.108
.080-.090
.101
.110
.116
7-19
.148-.158
.130
.089- .100
.120
.125
.128
8-18
.160-.170
.130
.095-.105
.120
.128
.136
10-16
.185-.195
.145
.099-.110
.136
.144
.152
11-16
.198-.210
.150
.113- .125
.149
.156
.169
12-16
.210-.220
.167
.125-.137
.157
.166
.177
13-16
.220-.230
.180
.127-.139
.169
.180
.187
1/4-15
.250-.260
.200
.161-.175
.189
.201
.218
5/16-14
.307-.137
.250
.200-.212
.238
.250
.257

Description: A thread forming screw with a double-lead, consisting of a low and a high thread. The lower thread varies in height from 1/3 to 1/2 that of the high thread, which is sharper and flatter than a standard thread.

Applications: for use in plastic, nylon, wood or other low-density materials. Thread design reduces driving torques, enhances resistance to thread stripping, improves pullout strength and lessens risk of cracking the work piece.

• Reduce cracking, splitting and boss breakage
• Increase pull-out strength
• Lower driving, higher strip out torques  

AB Hole Sizes

AB Hole Sizes

RECOMMENDED DRILL SIZES

Type AB & B

Self-Tapping Screw Size
Major Thread Diameter
Minor Thread Diameter
For Heavy Metals
For Light Metals
No.
Threads per Inch
Basic screw Diameter
Max.
Min.
Max.
Min.
Drill Size
Drill Size
2
32
.086
.088
.082
.064
.060
49
.0730
49
.0730
4
24
.112
.114
.108
.086
.082
41
.0960
41
.0960
5
20
.125
.130
.123

 

 
.094
.090
36
.1065
36
.1065
6
20
.138
.139
.132
.104
.099
32
.1160
32
.1160
7
19
.151
.154
.147
.115
.109
30
.1285
30
.1285
8
18
.164
.166
.159
.122
.116
28
.1405
29
.1360
10
16
.190
.189
.182
.141
.135
20
.1610
21
.1590
12
14
.216
.215
.208
.164
.157
13
.1850
14
.1820
1/4
14
.250
.246
.237
.192
.185
3
.2130
4
.2090
5/16
12
.313
.315
.306
.244
.236
I
.2720
H
.2660
3/8
12
.375
.380
.371
.309
.299
R
.3390
Q
.3320
  • Type AB point

    A thread forming screw combining locating point of Type A with thread size and pitch of Type B. Normal limitations of type B apply.
  • Type B point

    A thread forming screw for use in heavier metal .050 to .200 thick. Larger root diameter with finer thread pitch for light and heavy sheet metal non-ferrous castings, plastics, impregnated plywood, asbestos combinations, and other materials.

Mechanical Requirements

Mechanical Requirements

Mechanical Requirements
Stainless Steel & Non-Ferrous Fasteners

Grade(1)
General Descpription of Material
Bolts, Screws and Studs
Nuts
Full Size Bolts,
Screws, Studs
Machine Test Specimens of
Bolts, Screws, Studs
Hardness
Rockwell
Proof
Load
Stress
Hardness
Rockwell
Yield (2)
Strength
Tensile
Strength
Yield (2)
Strength
Tensile
Strength
Elong-
ation(3)
Min psi
Min psi
Min psi
Min psi
% Min.
Min
psi
Min
302 Stainless US 30,000 75,000 30,000 75,000 20 B75 75,000 B75
303A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B75 75,000 B75
304-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B75 75,000 B75
304 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
304-SH Austenitic
Stainless Steel-
Strain Hardened
See
Note 6
See
Note 6
See
Note 6
See
Note 6
15 C25 See
Note 6
C20
305-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
305 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
305-SH Austenitic
Stainless Steel-
Strain Hardened
See
Note 6
See
Note 6
See
Note 6
See
Note 6
15 C25 See
Note 6
C20
316-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
316 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
316-SH Austenitic
Stainless Steel-
Strain Hardened
See
Note 6
See
Note 6
See
Note 6
See
Note 6
15 C25 See
Note 6
C20
384-A Austenitic
Stainless Steel-
Sol. Annealed
30,000 75,000 30,000 75,000 20 B70 75,000 B70
384 Austenitic
Stainless Steel-
Cold Worked
50,000 90,000 45,000 85,000 20 B85 90,000 B85
410-H Martensitic
Stainless Steel-
Hardened and
Tempered
95,000 125,000 95,000 125,000 20 C22 125,000 C22
410-HT Martensitic
Stainless Steel-
Hardened and
Tempered
135,000 180,000 135,000 180,000 12 C36 180,000 C36
416-H Martensitic
Stainless Steel-
Hardened and
Tempered
95,000 125,000 95,000 125,000 20 C22 125,000 C22
416-HT Martensitic
Stainless Steel-
Hardened and
Tempered
135,000 180,000 135,000 180,000 12 C36 180,000 C36
430 Ferritic
Stainless Steel
40,000 70,000 40,000 70,000 20 B75 70,000 B75
464-HF Naval Brass 15,000 52,000 14,000 50,000 25 B56 52,000 B56
464 Naval Brass 27,000 60,000 25,000 57,000 25 B65 60,000 B65
462 Naval Brass 27,000 52,000 24,000 50,000 20 B65 52,000 B65
642 Aluminum Bronze 35,000 72,000 35,000 72,000 15 B75 72,000 B75
630 Aluminum Bronze 50,000 105,000 50,000 105,000 10 B90 105,000 B90
614 Aluminum Bronze 40,000 75,000 40,000 75,000 30 B70 75,000 B70
510 Phosphor Bronze 35,000 60,000 35,000 60,000 15 B60 60,000 B60
675 Manganese Bronze 22,000 55,000 22,000 55,000 20 B60 55,000 B60
655-HF Silicon Bronze 20,000 52,000 18,500 50,000 20 B60 52,000 B60
655 Silicon Bronze 38,000 70,000 36,000 68,000 15 B75 70,000 B75
651 Silicon Bronze 45,000 75,000 42,500 72,000 8 B75 75,000 B75
661 Silicon Bronze 38,000 70,000 38,000 70,000 15 B75 70,000 B75
NICU-
A-HF
Nickel-Copper
Alloy A
25,000 70,000 25,000 70,000 20 B70 70,000 B70
NICU-A Nickel-Copper
Alloy A
40,000 80,000 40,000 80,000 20 B80 80,000 B80
NICU-B Nickel-Copper
Alloy B
40,000 80,000 40,000 80,000 20 B80 80,000 B80
NICU-K(7) Nickel-Copper
Aluminum Alloy
90,000 130,000 90,000 130,000 20 C24 130,000 C24
2024-T4 Aluminum Alloy 40,000 55,000 40,000 55,000 14 B70 55,000 B70
6061-T6 Aluminum Alloy 35,000 42,000 35,000 42,000 12 B50 42,000 B50

Note 6. Austenitic stainless steel, strain hardened bolts, screws, studs, and nuts shall have the following strength per properties.

Product
Size
Bolts, Screws, Studs
Nuts
Tested Full Size
Machine Test Specimens,
Proof
Load
Stress
Yield
Strength
Tensile
Strength
Yield
Strength
Tensile
Strength
in.
min psi
min psi
min psi
min psi
psi
to 5/8 in. 100,000 125,000 90,000 115,000 125,000
over 5/8 to 1 in. 70,000 105,000 65,000 100,000 105,000
over 1 to 1-1/2 in. 50,000 90,000 45,000 85,000 90,000

Flat Washer Guide

Flat Washer Guide

USS Washer Steel or
USS Thru Hardened Washers
38-45 Rc

Size Outside Diameter Inside Diameter Thickness
1/4 47/64 5/16 .051/.080
5/16 7/8 3/8 .051/.080
3/8 1.00 7/16 .064/.104
7/16 1.25 .50 .064/.104
1/2 1.38 9/16 .086/.132
9/16 1.47 5/8 .086/.132
5/8 1.75 11/16 .108/.160
3/4 2.00 13/16 .122/.177
7/8 2.25 15/16 .136/.192
1.0 2.50 1.06 .136/.192
1.125 2.75 1.25 .136/.192
1.25 3.00 1.38 .136/.192
1.50 3.50 1.63 .153/.213

 

SAE Washer Steel or 
SAE Thru Hardened Washers
38-45 Rc

Size Outside Diameter Inside Diameter Thickness
1/4 5/8 9/32 .051/.080
5/16 11/16 11/32 .051/.080
3/8 13/16 16/32 .051/.080
7/16 59/64 15/32 .051/.080
1/2 1.06 17/32 .074/.121
9/16 1.16 19/32 .074/.121
5/8 1.31 21/32 .074/.121
3/4 1.47 13/16 .108/.160
7/8 1.75 15/16 .108/.160
1.00 2.00 1.06 .108/.160
1.125 2.25 1.25 .108/.160
1.25 2.50 1.38 .136/.192
1.50 3.00 1.63 .136/.192

Fine Thread

Fine Thread Sizes

 

National Fine Thread Sizes (UNF/UNRF)

Measured in Inches

Nominal Size
Major Diameter
Threads/inch
Basic Pitch Diameter
Minor Diameter
Lead Angle
at Basic Pitch Diameter
Height of Fundamental Triangle
Tensile Stress Area
 
 
 
 
 
(Degrees)
(Min)
 
(square inches)
#0
0.060 80 0.052 0.047 4 23
0.01083
0.002
#1
0.073 72 0.064 0.058 3 57
0.01203
0.003
#2
0.086 64 0.076 0.069 3 45
0.01353
0.004
#3
0.099 56 0.087 0.080 3 43
0.01547
0.005
#4
0.112 48 0.099 0.089 3 51
0.01804
0.007
#5
0.125 44 0.110 0.100 3 45
0.01968
0.008
#6
0.138 40 0.122 0.111 3 44
0.02165
0.010
#8
0.164 36 0.146 0.134 3 28
0.02406
0.015
#10
0.190 32 0.170 0.156 3 21
0.02706
0.020
#12
0.216 28 0.193 0.177 3 22
0.03093
0.026
1/4
0.250 28 0.227 0.211 2 52
0.03093
0.036
5/16
0.313 24 0.285 0.267 2 40
0.03608
0.058
3/8
0.375 24 0.348 0.330 2 11
0.03608
0.088
7/16
0.438 20 0.405 0.383 2 15
0.04330
0.119
1/2
0.500 20 0.468 0.446 1 57
0.04330
0.160
9/16
0.563 18 0.526 0.502 1 55
0.04811
0.203
5/8
0.625 18 0.589 0.565 1 43
0.04811
0.256
3/4
0.750 16 0.709 0.682 1 36
0.05413
0.373
7/8
0.875 14 0.829 0.798 1 34
0.06186
0.509
1
1.000 14 0.946 0.903 1 36
0.07217
0.663
1 1/8
1.125 12 1.071 1.035 1 25
0.07217
0.856
1 1/4
1.250 12 1.196 1.160 1 16
0.07217
1.073
1 3/8
1.375 12 1.321 1.285 1 9
0.07217
1.315
1 1/2
1.500 12 1.446 1.410 1 3
0.07217
1.581
Standards set by American Society of Mechanical Engineers

Coarse Thread

Coarse Thread Sizes

 

National Coarse Thread Sizes (UNC/UNRC)

Measured in Inches

Nominal Size
Major Diameter
Threads/inch
Basic Pitch Diameter
Minor Diameter
Lead Angle
at Basic Pitch Diameter
Height of Fundamental Triangle
Tensile Stress Area
 
 
 
 
 
(Degrees)
(Min)
 
(square inches)
#1 0.073 64 0.063 0.056 4 31 0.01353
0.003
#2 0.086 56 0.074 0.067 4 22 0.01547
0.004
#3 0.099 48 0.086 0.076 4 26 0.01804
0.005
#4 0.112 40 0.096 0.085 4 45 0.02165
0.006
#5 0.125 40 0.109 0.098 4 11 0.02165
0.008
#6 0.138 32 0.118 0.104 4 50 0.02706
0.009
#8 0.164 32 0.144 0.130 3 58 0.02706
0.014
#10 0.190 24 0.163 0.145 4 39 0.03608
0.018
#12 0.216 24 0.189 0.171 4 1 0.03608
0.024
1/4 0.250 20 0.218 0.196 4 11 0.04330
0.032
5/16 0.313 18 0.276 0.252 3 40 0.04811
0.052
3/8 0.375 16 0.334 0.307 3 24 0.05413
0.078
7/16 0.438 14 0.391 0.360 3 20 0.06186
0.106
1/2 0.500 13 0.450 0.417 3 7 0.06662
0.142
9/16 0.563 12 0.508 0.472 2 59 0.07217
0.182
5/8 0.625 11 0.566 0.527 2 56 0.07873
0.226
3/4 0.750 10 0.685 0.642 2 40 0.08660
0.334
7/8 0.875 9 0.803 0.755 2 31 0.09623
0.462
1 1.000 8 0.919 0.865 2 29 0.10825
0.606
1 1/8 1.125 7 1.032 0.941 2 31 0.12372
0.763
1 1/4 1.250 7 1.157 1.095 2 15 0.12372
0.969
1 3/8 1.375 6 1.267 1.195 2 24 0.14434
1.155
1 1/2 1.500 6 1.392 1.320 2 11 0.14434
1.405
1 3/4 1.750 5 1.620 1.534 2 15 0.17321
1.900
2 2.000 4 1/2 1.856 1.759 2 11 0.19245
2.500
2 1/4 2.250 4 1/2 2.106 2.009 1 55 0.19245
3.250
2 1/2 2.500 4 2.338 2.229 1 57 0.21651
4.000
2 3/4 2.750 4 2.588 2.479 1 46 0.21651
4.930
3 3.000 4 2.838 2.729 1 36 0.21651
5.970
3 1/4 3.250 4 3.088 2.979 1 29 0.21651
7.100
3 1/2 3.500 4 3.338 3.229 1 22 0.21651
8.330
3 3/4 3.750 4 3.588 3.479 1 16 0.21651
9.660
4 4.000 4 3.838 3.729 1 11 0.21651
11.080
Standards set by American Society of Mechanical Engineers

Type A point

Screw Point Styles

Screw Point Styles

Screw Point Styles

Tapping Screws type A, AB, B, BP

Type A point
Type A point: A thread forming screw for use in thin metal .015 to .050 thick. Used with drilled, punched or nested holes in sheet metal, resin impregnated plywood, and combinations of material.
Type AB Point
Type AB point: A thread forming screw combining the locating point of Type A with thread size and pitch of Type B. Normal limitations of type B apply.
Type B Point
Type B point: A thread forming screw for use in heavier metal .050 to .200 thick. Larger root diameter with finer thread pitch for light and heavy sheet metal non – ferrous castings, plastics, impregnated plywood, combinations of materials, and other materials.
Type BP Point
Type BP Point: Same as Type B but has a cone point for use where holes are slightly misaligned.
Decking Screw
Decking Screws: Exterior screw for applications including decks, treated wood, arbors, fences and other applications that require a high degree of corrosion resistant.
Decking Screw 17
Decking Screws 17: The addition of the type 17 point help the screw penatrate quickly in some of the hardest woods.
Partical Board Screw
Partical Board Screws: Made with asymetrical threads that resists slippage and pull out. These superior holding power screws offer fast assembly in most particle board and wood applications. These screws are available in coarse and fine threads.

Thread Cutting Screws Type F, D, T, BT, G, 1, 17, 23, 25

Type F Point
Type F point: A thread cutting screw with machine screw thread with blunt tapered point, having multi – cutting edges and chip cavities. For heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic.
Type 1 Point
Type 1 point: A thread cutting screw with single flute for general use. Produces a fine standard machine screw thread for field replacement. These are also known as a Type D thread cutting screw.
Type 23 Point
Type 23 point: A thread cutting screw in the fine thread series offering maximum thread cutting area and excellent chip clearing, with minimum tightening torques. These thread cutting screws are also known as a type T thread cutting screw.
Type 25 Point
Type 25 point: A thread cutting screw similar to type 23 point except with coarse Type B thread. For plastics and other soft materials with large chip clearing and cutting edges. These screws are also known as a type BT thread cutting screws
Type 17 Point
Type 17 point: A thread cutting screw for wood with a coarse tapping screw thread and a special long sharp point fluted to capture chips. Type 17 points can also be on Hi-Lo, deep root, deck screws and partical board screws.
Type BF Point
Type BF Point: Thread cutting screw with type B threads and blunt taper point having multiple cutting edges and chip cavities.
Type G Point
Type G Point: Blunt die point with a single through slot to form two cutting edges. For same general use as type C but where less driving torque is required.

Thread Forming Screws Type “TT”, C, CA, PT trilobe for plastic

Tri-Round
Tri-Round: Type” TT” a thread forming screw in mostly coarse machine screw threads. It gives a further advantage of not producing chips verses a thread cutting screw in an untapped hole. Three vertexes perform a roll – forming process to form mating threads. These can be used to eliminate the tapping of unthreaded holes. Much better thread forming than Type C or CA, and drives with less torque.
Type C Point
Type C point: Is a thread forming screw with either coarse or fine pitch machine screw thread and blunt tapered point. Eliminates chips and permits replacement with standard screw in the field. Higher driving torque required. Type C points are usable in heavy sheet metal and die castings.
Tyoe CA Point
Type CA point: A thread forming screw with either coarse or fine pitch machine screw thread. Same as Type C except with a Gimlet point. The locating point works better than Type C where holes between two adjoining pieces of sheet metal may be somewhat misaligned.
Type PT Thread
Type PT Thread Forming: A 48′ or 60′ thread feature reduces displacement of plastic for less internal stress and less tendency to fracture bosses. Better drive/ strip ratio and strip torque are obtained when compared with conventional Type B tapping screws. A good choice for plastic applications.
Type Hi-Lo Point
Type Hi-Lo Point: A Hi-Lo is a dual lead thread formong screw for use in plastic, nylon, wood, or other low density materials. The thread design reduces driving torque, improves drive to strip out torque and lessons the risk of cracking the application.
Low Root
Low Root: Low root thread is designed in sharp points or blunt points. The wide spaced thread forming screw is designed for plastic applications due to the increase in the drive to strip out ratio and reduced cracking of the boss. There are many variations in this catagory and per print parts. This catagory of screws comes in blunt points as well as the addition of a thread cutting feature. Please contact your Eagle salesperson to assist you in this category of fasteners.

Self Drilling & Self Piercing Screws

Self Piercing
Self-Piercing: Produces more secure sheet metal assemblies. This fastener can be used as self-drilling screw or used to drive thru pre-punched holes or no holes in light gauge sheet metal. The twin lead drills straight thru sheet metal at peak speed. Perfectly mated threads increase strip and back out pressures. These are also know as a needle point, speed points or sprint points.
Self Drilling
Self-Drilling: Comes with drilling points that will drill through metal, wood, and plastic applications. Eliminates all hole preparation, therefore reducing the in-place fastener cost. No punching, drilling or tapping required. There are several points styles including type 2, 3, 4 & 5 drill points depending on the application and size.

Point Styles for Machine Screws and Tapping Screws

Header Point
Header Point: One of the least expensive pointing operations applied at the time of heading. This operation provides an end chamfer starting with a diameter smaller than the root diameter of the thread. The minimum reduction of the point is approximately 10% below the maximum minor diameter with an included angle of 40 to 50.
Dog Point
Dog Point: A straight pointed section reduced in diameter slightly below the root diameter of the thread, usually extending in length about two-thirds the diameter of the thread. Recommended for ease in starting, to insure against stripping fine threaded products, and to increase efficiency along production lines.
Rolled Point
Rolled Point: An efficient method of producing pointed long studs or long screws with an end chamfer similar to the Die Point. The last thread and a half is slightly cupped by the thread roll-over operation.
Pinch Point
Pinch Point (Rounded): An inexpensive method of applying a 40°, 60° or 90° lead-in point having a slightly rounded contour but with pinch-off marks on its surface. Used for aligning several sheets or assembling several parts requiring pilot action.
Nail Point
Nail Point (Pinched): Usually supplied with an approximate 45° included angle having a sharp point and slightly squared surface. Used for impinging or locking against wood or other soft material. Other degrees of included angle and sharpness also available.
Cupped Point
Cupped Point: A special cup section supplied on the end of the threaded member having a depression in the end to reduce the area in contact with the surface which increases its holding and locking power under pressure.
Round Point
Round Point: A dome-like rounded surface applied to the end of a threaded member in order to offer pressure without disfigurement. Used for adjusting members where friction without cutting action is desirable.
Cone Point
Cone Point: A precision forming operation to provide any required included angle. Offers a smooth surface, accurate length, and a sharp point which can be produced to any desired contour to fit your particular requirements.
U Drive Point
Type U Drive Point: A thread forming screw with high Helix thread for driving or hammering into sheet metal, castings, fiber or plastics for permanent, quick assemblies.

Metric to Inches

Metric to Inches

Fasteners’ Metric to Inches Conversion Chart

Millimeters

 

Inches

 

Inches

 

Centimeters

 

Meters

 

 
Decimal

 

Fractional

 

 
 
0.3969
0.0156
1/64
0.04
0.0004
0.7925
0.0312
1/32
0.08
0.0008
1.0000
0.0394
 
0.10
0.0010
1.5875
0.0625
1/16
0.16
0.0016
2.0000
0.0788
 
0.20
0.0020
3.1750
0.1251
1/8
0.32
0.0032
3.0000
0.1182
 
0.30
0.0030
4.0000
0.1576
 
0.40
0.0040
5.0000
0.1970
 
0.50
0.0050
6.3500
0.2502
1/4
0.64
0.0064
7.0000
0.2758
 
0.70
0.0070
8.0000
0.3152
 
0.80
0.0080
9.0000
0.3546
 
0.90
0.0090
9.5250
0.3753
3/8
0.95
0.0095
10.0000
0.3940
 
1.00
0.0100
11.0000
0.4334
 
1.10
0.0110
12.0000
0.4728
 
1.20
0.0120
12.7000
0.5004
1/2
1.27
0.0127
13.0000
0.5122
 
1.30
0.0130
14.0000
0.5516
 
1.40
0.0140
15.0000
0.5910
 
1.50
0.0150
15.8750
0.6255
5/8
1.59
0.0159
16.0000
0.6304
 
1.60
0.0160
17.0000
0.6698
 
1.70
0.0170
18.0000
0.7092
 
1.80
0.0180
19.0500
0.7506
3/4
1.91
0.0191
20.0000
0.7880
 
2.00
0.0200
22.2250
0.8757
7/8
2.22
0.0222
25.4000
1.0000
1 inch
2.54
0.0254
30.0000
1.1820
 
3.00
0.0300
35.0000
1.3790
 
3.50
0.0350
40.0000
1.5760
 
4.00
0.0400
45.0000
1.7730
 
4.50
0.0450
50.0000
1.9700
 
5.00
0.0500
60.0000
2.3640
 
6.00
0.0600
70.0000
2.7580
 
7.00
0.0700
80.0000
3.1520
 
8.00
0.0800
90.0000
3.5460
 
9.00
0.0900
100.0000
3.9400
 
10.00
0.1000
110.0000
4.3340
 
11.00
0.1100
120.0000
4.7280
 
12.00
0.1200
130.0000
5.1220
 
13.00
0.1300
140.0000
5.5160
 
14.00
0.1400
150.0000
5.9100
 
15.00
0.1500
160.0000
6.3040
 
16.00
0.1600
170.0000
6.6980
 
17.00
0.1700
180.0000
7.0920
 
18.00
0.1800
190.0000
7.4860
 
19.00
0.1900
200.0000
7.8800
 
20.00
0.2000
220.0000
8.6680
 
22.00
0.2200
240.0000
9.4560
 
24.00
0.2400
260.0000
10.2440
 
26.00
0.2600
280.0000
11.0320
 
28.00
0.2800
300.0000
11.8200
 
30.00
0.3000
320.0000
12.6080
 
32.00
0.3200
340.0000
13.3960
 
34.00
0.3400
360.0000
14.1840
 
36.00
0.3600
400.0000
15.7600
 
40.00
0.4000
440.0000
17.3360
 
44.00
0.4400
480.0000
18.9120
 
48.00
0.4800
500.0000
19.7000
 
50.00
0.5000
750.0000
29.5500
 
75.00
0.7500
1000.0000
39.4000
 
100.00
1.0000

Screw Drive Types

Screw Drive Types

Quick Reference Guide

Here is a quick reference guide to screw drive heads. There are many combinations between the head style, drive and point styles. Eagle Fastener stocks a full line of standard fasteners, machine screws, tapping screws, sheet metal screws, thread-forming screws, and thread-cutting screws.

Materials

Materials include low carbon steel, medium carbon steel, high carbon steel, alloy steel, specialty steels, aluminum, brass, 400 stainless steel, 410 stainless steel, 416 stainless steel, 430 stainless steel, 18-8 stainless steel, 302 stainless steel, 304 stainless steel, 304L stainless steel,305 stainless steel, 309 stainless steel, 310 stainless steel, 316 stainless steel, 316L stainless steel, titanium, nickel-copper, Monel, and other specialty alloys.

Having Trouble Finding What you Need?

Did you not see what you are looking for? There are many head styles and drives not shown. Call us and we will be happy to assist you!

Here is a quick reference guide to screw drive heads. There are many combinations between the head style, drive and point styles. Eagle Fastener stocks a full line of standard fasteners, machine screws, tapping screws, sheet metal screws, thread-forming screws, and thread-cutting screws.

Drive Heads

 

You need your parts fast—-We can help. Fast deliveries on standards and per print fastener special available! Tell us when you need it—Eagle delivers!

Having Trouble Finding What you Need? Did you not see what you are looking for? There are many head styles and drives not shown. Call us and we will be happy to assist you!  

Materials: low carbon steel, medium carbon steel, high carbon steel, alloy steel, specialty steels, aluminum, brass, 400 stainless steel, 410 stainless steel, 416 stainless steel, 430 stainless steel, 18-8 stainless steel, 302 stainless steel, 304 stainless steel, 304L stainless steel,305 stainless steel, 309 stainless steel, 310 stainless steel, 316 stainless steel, 316L stainless steel, titanium, nickel-copper, Monel, and other specialty alloys.

Pan

Screw Head Styles

Screw Head Styles

We supply a great deal of semi standard head styles including, modified truss heads, Round washer heads, cheese heads, slotted truss heads with serrations, pan heads with serrations, truss heads with serrations, hex washer head with 6 ½ moons nibs, Hex washer with torque breaking serrations, hex washer with locking serrations, k-lath, framing head, pocket screws, trim heads, Trim Oval, 100 degree flat heads, Jackson head, stove bolts, cyclone head, crimtite®head, & EsGrip® head.

Screw Head Styles

 

Head Style 

 

Description

 

Use

 

Pan
Pan
Slotted pan heads have a flat or gently rounded top surface, cylindrical sides and a flat bearing surface. Phillips, Torx® and square pan heads have a rounded top surface, cylindrical sides and a flat bearing surface.  
For general applications. Can be substituted in most applications for round, truss or binding heads.
Indented Hex
Indented Hex
Have an indented top surface, six flat sides, and a flat bearing surface.
Preferred in high volume assembly where pneumatic equipment is used to drive the screw. Can transmit significantly higher tightening torque levels than other head styles.
Indented Hex Washer
Indented Hex Washer
Has an indented top surface, six flat sides with a flat washer which projects beyond the sides and provides a flat bearing surface. The washer and hex are formed together as one piece.
Increased bearing surface reduces likelihood of crushing mating surfaces.
Serrated Hex Washer
Serrated Hex Washer

Same as an indented Hex Washer Head but with serrations formed into the bearing surface on the underside of the washer.

Available slotted or un-slotted
Serration geometry is oriented to resist loosening. Also slows the screw at the point of engagement with the mating piece of sheet metal so as to minimize stripping.
Truss
Truss

Has a rounded top with a flat bearing surface greater in area than a round head screw of the same nominal size.

Full contour Truss heads also available.
Weaker than pan or round heads but preferred in applications where minimal clearance exists above the head. Truss profile provides a trim finished appearance.
Wafer
Wafer
A countersunk head with a flat top surface and a cone-shaped bearing surface. The wafer’s 70° conical under head area does not extend to the outer edge of the head, providing a bearing surface of 16° around the circumference of the under head.
Preferred head style for Type-CSD self drilling screws. Provides the necessary bearing surface and flush fit in wood and softer materials. The head/shank fillet is contoured to strengthen the under head area.
Oval 82
Oval 82°
A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82°.
Preferred over a flat head in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites.
Oval Undercut 82
Oval Undercut 82°
Similar to an 82° oval head except that the head is undercut to 70% of its normal side height.
Standard for short lengths because it allows greater thread length.
Bugle
Bugle
A countersunk head with a flat top and a concave under head bearing surface.
Designed specifically for use in drywall. Distributes bearing stress over a wider area than flat heads.
Flat 82
Flat 82°
A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 82°.
Used in applications where protrusion of the fastener above the mating surface is unacceptable. Use a protrusion gage when measuring head height.
Flat Undercut 82
Flat Undercut 82°
Similar to an 82° flat head except that the head is undercut to 70% of its normal side height.
Standard for short lengths because it allows greater length of threads. Also avoids transition fillet and assembly interference.
Metric Flat 90
Metric Flat 90°
A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 90°
Used in applications where protrusion of the fastener above the mating surface is unacceptable. Use a protrusion gage when measuring head height.
Metric-Oval 90
Metric Oval 90°
A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82°.
Preferred over a flat head in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites.
Round
Round
General purpose head with high crown and deep recess but the diameter is smaller than a pan head.
For general applications and where the requirement of a smaller head OD in application.
Fillister
Fillister

The-standard fillister head has a smaller diameter than the round head. Fillister is higher with a correspondingly deeper slot.

Fillister heads can be shaved & drilled.
The smaller diameter head increases the pressure applied on the smaller area and can be assembled close to flanges and raised surfaces. Headed in counter bored dies to Insure concentricity, they may be used successfully in counter bored holes. Also used heavily in electrical applications

 

We supply a great deal of semi standard head styles including, modified truss heads, Round washer heads, cheese heads, slotted truss heads with serrations, pan heads with serrations, truss heads with serrations, hex washer head with 6 ½ moons nibs, Hex washer with torque breaking serrations, hex washer with locking serrations, k-lath, framing head, pocket screws, trim heads, Trim Oval, 100 degree flat heads, Jackson head, stove bolts, cyclone head, crimtite®head, & EsGrip® head.

 

Screw Head Styles

 

Head Style 

 

Description

 

Use

 

Pan
Pan
Slotted pan heads have a flat or gently rounded top surface, cylindrical sides and a flat bearing surface. Phillips, Torx® and square pan heads have a rounded top surface, cylindrical sides and a flat bearing surface.  
For general applications. Can be substituted in most applications for round, truss or binding heads.
Indented Hex
Indented Hex
Have an indented top surface, six flat sides, and a flat bearing surface.
Preferred in high volume assembly where pneumatic equipment is used to drive the screw. Can transmit significantly higher tightening torque levels than other head styles.
Indented Hex Washer
Indented Hex Washer
Has an indented top surface, six flat sides with a flat washer which projects beyond the sides and provides a flat bearing surface. The washer and hex are formed together as one piece.
Increased bearing surface reduces likelihood of crushing mating surfaces.
Serrated Hex Washer
Serrated Hex Washer

Same as an indented Hex Washer Head but with serrations formed into the bearing surface on the underside of the washer.

Available slotted or un-slotted
Serration geometry is oriented to resist loosening. Also slows the screw at the point of engagement with the mating piece of sheet metal so as to minimize stripping.
Truss
Truss

Has a rounded top with a flat bearing surface greater in area than a round head screw of the same nominal size.

Full contour Truss heads also available.
Weaker than pan or round heads but preferred in applications where minimal clearance exists above the head. Truss profile provides a trim finished appearance.
Wafer
Wafer
A countersunk head with a flat top surface and a cone-shaped bearing surface. The wafer’s 70° conical under head area does not extend to the outer edge of the head, providing a bearing surface of 16° around the circumference of the under head.
Preferred head style for Type-CSD self drilling screws. Provides the necessary bearing surface and flush fit in wood and softer materials. The head/shank fillet is contoured to strengthen the under head area.
Oval 82
Oval 82°
A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82°.
Preferred over a flat head in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites.
Oval Undercut 82
Oval Undercut 82°
Similar to an 82° oval head except that the head is undercut to 70% of its normal side height.
Standard for short lengths because it allows greater thread length.
Bugle
Bugle
A countersunk head with a flat top and a concave under head bearing surface.
Designed specifically for use in drywall. Distributes bearing stress over a wider area than flat heads.
Flat 82
Flat 82°
A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 82°.
Used in applications where protrusion of the fastener above the mating surface is unacceptable. Use a protrusion gage when measuring head height.
Flat Undercut 82
Flat Undercut 82°
Similar to an 82° flat head except that the head is undercut to 70% of its normal side height.
Standard for short lengths because it allows greater length of threads. Also avoids transition fillet and assembly interference.
Metric Flat 90
Metric Flat 90°
A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 90°
Used in applications where protrusion of the fastener above the mating surface is unacceptable. Use a protrusion gage when measuring head height.
Metric-Oval 90
Metric Oval 90°
A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82°.
Preferred over a flat head in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites.
Round
Round
General purpose head with high crown and deep recess but the diameter is smaller than a pan head.
For general applications and where the requirement of a smaller head OD in application.
Fillister
Fillister

The-standard fillister head has a smaller diameter than the round head. Fillister is higher with a correspondingly deeper slot.

Fillister heads can be shaved & drilled.
The smaller diameter head increases the pressure applied on the smaller area and can be assembled close to flanges and raised surfaces. Headed in counter bored dies to Insure concentricity, they may be used successfully in counter bored holes. Also used heavily in electrical applications

 

Eagle Fastener Corporation

453 E. Dartmoor Drive
Crystal Lake, IL 60014

PO Box 1259, Crystal Lake, IL 60014

Phone 815-455-7177
Phone 800-323-6142
Fax 815-455-7205


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