1-800-466-9780
1-800-466-9780

Machine Screws

External Threads – Class 2A

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Nominal Size &Threads/lnch & Series Designation Allowance Major Diameter Pitch Diameter
Max Min Max Min Tolerance
0-80
1-64
1-72
2-56
2-64		 UNF
UNC
UNF
UNG
UNF		 0.0005
0.0006
0.0006
0.0006
0.0006		 0.0595
0.0724
0.0724
0.0854
0.0854		 0.0563
0.0686
0.0689
0.0813
0.0816		 0.0514
0.0623
0.0634
0.0738
0.0753		 0.0496
0.0603
0.0615
0.0717
0.0733		 0.0018
0.0020
0.0019
0.0021
0.0020
3-48
3-56
4-40
4-48
5-40		 UNG
UNF
UNG
UNF
UNC		 0.0007
0.0007
0.0008
0.0007
0.0008		 0.0938
0.0983
0.1112
0.1113
0.1242		 0.0938
0.0942
0.1061
0.1068
0.1191		 0.0848
0.0867
0.0950
0.0978
0.1080		 0.0825
0.0845
0.0925
0.0954
0.1054		 0.0023
0.0022
0.0025
0.0024
0.0026
5-44
6-32
6-40
8-32
8-36		 UNF
UNG
UNF
UNG
UNF		 0.0007
0.0008
0.0008
0.0009
0.0008		 0.1243
0.1372
0.1372
0.1631
0.1632		 0.1195
0.1312
0.1321
0.1571
0.1577		 0.1095
0.1169
0.1210
0.1428
0.1452		 0.1070
0.1141
0.1184
0.1399
0.1424		 0.0025
0.0028
0.0026
0.0029
0.0028
10-24
10-32
12-24
12-28
1/4-20		 UNG
UNF
UNG
UNF
UNG		 0.0010
0.0009
0.0010
0.0010
0.0011		 0.1890
0.1891
0.2150
0.2150
0.2489		 0.1818
0.1831
0.2078
0.2085
0.2408		 0.1619
0.1688
0.1879
0.1918
0.2164		 0.1586
0.1658
0.1845
0.1886
0.2127		 0.0033
0.0030
0.0034
0.0032
0.0037
1/4-28
5/16-18
5/16-24
3/8-16
3/8-24		 UNF
UNG
UNF
UNG
UNF		 0.0010
0.0012
0.0011
0.0013
0.0011		 0.2490
0.3113
0.3114
0.3737
0.3739		 0.2425
0.3026
0.3042
0.3643
0.3667		 0.2258
0.2752
0.2843
0.3331
0.3468		 0.2225
0.2712
0.2806
0.3287
0.3430		 0.0033
0.0040
0.0037
0.0044
0.0038
7/16-14
7/16-20
1/2-13
1/2-20
9/16-12		 UNG
UNF
UNG
UNF
UNG		 0.0014
0.0013
0.0015
0.0013
0.0016		 0.4361
0.4362
0.4985
0.4987
0.5609		 0.4258
0.4281
0.4876
0.4906
0.5495		 0.3897
0.4037
0.4485
0.4662
0.5068		 0.3850
0.3995
0.4435
0.4619
0.5016		 0.0047
0.0042
0.0050
0.0043
0.0052
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16		 UNF
UNG
UNF
UNG
UNF		 0.0014
0.0016
0.0014
0.0018
0.0015		 0.5611
0.6234
0.6236
0.7482
0.7485		 0.5524
0.6113
0.6149
0.7353
0.7391		 0.5250
0.5644
0.5875
0.6832
0.7079		 0.5205
0.5589
0.5828
0.6773
0.7029		 0.0045
0.0055
0.0047
0.0059
0.0050
7/8-9
7/8-14
1-8
1-12
1-14		 UNG
UNF
UNG
UNF
UNS		 0.0019
0.0016
0.0020
0.0018
0.0017		 0.8731
0.0834
0.9980
0.9982
0.9983		 0.8592
0.8631
0.9830
0.9868
0.9880		 0.8009
0.8270
0.9168
0.9441
0.9519		 0.7946
0.8216
0.9100
0.9382
0.9463		 0.0063
0.0054
0.0068
0.0059
0.0056
11/8-7
11/8-8
11/8-12
11/4-7
1114-8		 UNG
UN
UNF
UNG
UN		 0.0022
0.0021
0.0018
0.022
0.0021		 1.1228
1.1229
1.1232
1.2478
1.2479		 1.1064
1.1079
1.1118
1.2314
1.2329		 1.0300
1.0417
1.0691
1.1550
1.1667		 1.0228
1.0348
1.0631
1.1476
1.1597		 0.0072
0.0069
0.0060
0.0074
0.0070
11/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6		 UNF
UNC
UN
UNF
UNC		 0.0018
0.0024
0.0022
0.0019
0.0024		 1.2482
1.3726
1.3728
1.3731
1.4976		 1.2368
1.3544
1.3578
1.3617
1.4794		 1.1941
1.2643
1.2916
1.3190
1.3893		 1.1879
1.2563
1.2844
1.3127
1.3812		 0.0062
0.0080
0.0072
0.0063
0.0081
1 1/2-8
1 1/2-12
1 5/8-8
1 3/4-5
1 3/4-8		 UN
UNC
UN
UNC
UN		 0.0022
0.0019
0.0022
0.0027
0.0023		 1.4978
1.4981
1.6228
1.7473
1.7477		 1.4828
1.4867
1.6087
1.7268
1.7327		 1.4166
1.4440
1.5416
1.6174
1.6665		 1.4093
1.4376
1.5342
1.6085
1.6590		 0.0073
0.0064
0.0074
0.0089
0.0075
1 7/8-8
2-4 1/2
2-8
2 1/4-4.5
2 1/4-8		 UN
UNC
UN
UNC
UN		 0.0023
0.0029
0.0023
0.0029
0.0024		 1.8727
1.9971
1.9977
2.2471
2.2476		 1.8577
1.9751
1.9827
2.2251
2.2326		 1.7915
1.8528
1.9165
2.1028
2.1664		 1.7838
1.8433
1.9087
2.0931
2.1584		 0.0077
0.0095
0.0078
0.0097
0.0080
2 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4		 UNC
UN
UNC
UN
UNC		 0.0031
0.0024
0.0032
0.0025
0.0032		 2.4969
2.4976
2.7468
2.7475
2.9968		 2.4731
2.4826
2.7230
2.7325
2.9730		 2.3345
2.4164
2.5844
2.6663
2.8344		 2.3241
2.4082
2.5739
2.6580
2.8237		 0.0104
0.0082
0.0105
0.0083
0.0107
3-8
3 1/4-4
3 1/4-8
3 1/2-4
3 1/2-8		 UN
UNC
UN
UNC
UN		 0.0026
0.0033
0.0026
0.0033
0.0026		 2.9974
3.2467
3.2474
3.4967
3.4974		 2.9824
3.2229
3.2324
3.4729
3.4824		 2.9162
3.0843
3.1662
3.3343
3.4162		 2.9077
3.0734
3.1575
3.3233
3.4074		 0.0085
0.0109
0.0087
0.0110
0.0088
3 3/4-4
3 3/4-8
4-4
4-8		 UNC
UN
UNC
UN		 0.0034
0.0027
0.0034
0.0027		 3.7466
3.7473
3.9966
3.9973		 3.7228
3.7323
3.9728
3.9823		 3.5842
3.6661
3.8342
3.9161		 3.5730
3.6571
3.8229
3.9070		 0.0112
0.0090
0.0113
0.0091

Machine Screws

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Nominal Screw Size O thru l2 1/4 thru 3/4
Nominal Screw Length Tolerance on Length
Up to 1/2 in., Incl.
Over 1/2 to 1 in., Incl.
Over 1 to 2 in., Incl.
Over 2 in.		 -0.02
-0.03
-0.06
-0.09		 -0.03
-0.03
-0.06
-0.09
Machine Screws
Type A – AB

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Nominal Screw Length Tolerance on Length
Up to 1 in., Incl.
Over 1 in.		 + 0.03
+ 0.05
Type A - AB Screws
Type B, F, H-L 1,
25 and 23

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Nominal Screw Length Tolerance on Length
Up to 3/4 in., Incl.
Over 3/4 to 1-1/2 in., Incl.		 – 0.03
– 0.05
Type B, F, H-L, 1, 25, 23 Screws
Type U

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Nominal Screw Length Tolerance on Length
Up to 3/8 in., Incl.
Over 3/8 in.		 + 0.02
+ 0.03
Type U Screws
Wood Screws Click here toRequest a quote.

Nominal Screw Length Tolerance on Length
Up to 5/8in., Incl.
Over 5/8 to l-1/2 in., Incl.
Over l-1/2 to 2-3/4 in., Incl.
Over 2-3/4 to 5 in., Incl.		 -0.03
-0.05
-0.06
-0.09
Wood Screws

Head Dimensions

Binding Head Undercut Machine Screws Binding Head Undercut
Machine Screws		 Binding Head Undercut Machine Screws
SLOTTED SLOTTED

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Nominal Size A F O J T U X
Head Dia. Height of Head Width of Slot Depth of Slot Dimensions of Undercut
Hgt. of Oval Total Hgt. Diameter Depth
Max. Min.. Max. Min.. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min..
2
3
4
5
6
8
10
1/4		 .181
.208
.235
.263
.290
.344
.399
.513		 .171
.197
.223
.249
.275
.326
.378
.488		 .018
.022
.025
.029
.032
.039
.045
.061		 .013
.016
.018
.021
.024
.029
.034
.046		 .050
.059
.068
.078
.087
.105
.123
.165		 .043
.052
.061
.069
.078
.095
.112
.152		 .031
.035
.039
.043
.048
.054
.060
.075		 .023
.027
.031
.035
.039
.045
.050
.064		 .030
.036
.042
.048
.053
.065
.077
.105		 .024
.025
.034
.035
.044
.054
.064
.088		 .141
.162
.184
.205
.226
.269
.312
.410		 .124
.143
.161
.180
.199
.236
.274
.360		 .010
.011
.012
.014
.015
.017
.020
.026		 .005
.006
.007
.009
.010
.012
.015
.021
Flat Head Screws Flat Head
Machine Screws
Wood Screws *
Tapping Screws		 Phillips Screws
SLOTTED PHILLIPS

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Nominal Size A H J T M G N Phillips
Driver Size
Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess
Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
2
4
5
6
7*
8
9*
10
12
14*
1/4
5/16
3/8
1/2		 .172
.225
.252
.279
.305
.332
.358
.385
.438
.491
.507
.635
.762
.875		 147
.195
.220
.244
.268
.292
.316
.340
.389
.437
.452
.568
.685
775		 .051
.067
.075
.083
.091
.100
.108
.116
.132
.148
.153
.191
.230
.223		 .040
.055
.062
.069
.076
.084
.091
.098
.112
.127
.131
.165
.200
.198		 .031
.039
.043
.048
.048
.054
.054
.060
.067
.075
.075
.084
.094
.106		 .023
.031
.035
.039
.039
.045
.045
.050
.056
.064
.064
.072
.081
.091		 .023
.030
.034
.038
.041
.045
.049
.053
.060
.068
.070
.088
.106
.103		 .015
.020
.022
.024
.027
.029
.032
.034
.039
.044
.046
.058
.070
.065		 .102
.128
.154
.174
.182
.189
.258
.204
.268
.283
.283
.365
.393
.424		 .089
.115
.141
.161
.169
.176
.245
.191
.255
.270
.270
.352
.380
.411		 .063
.089
.086
.106
.114
.121
.146
.136
.156
.171
.171
.216
.245
.276		 .017
.018
.027
.029
.030
.031
.034
.032
.036
.039
.035
.061
.065
.069		 1
1
2
2
2
2
2
2-3*
3
3
3
4
4
4

Head Dimensions

Flat Head Undercut Screws Flat Head Undercut
Machine Screws
Self Tapping Screws		 Flat Head Undercut Screws
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Nominal
Size		 L A H J T M G N Phillips
Driver
Size
These
Lengths or Shorter
are
Undercut		 Head Diameter Height of
Head		 Width
Of
Slot		 Depth of
Slot		 Dimensions of Recess
Max.
Edge
Sharp		 Min..
Edge
Rounded
or Flat		 Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min.
4
6
8
10
12
1/4
5/16
3/8		 3/16
3/16
1/4
5/16
3/8
7/16
1/2
9/16		 0.225
0.279
0.332
0.385
0.438
0.507
0.635
0.762		 0.195
0.244
0.292
0.340
0.389
0.452
0.568
0.685		 0.047
0.059
0.070
0.081
0.092
0.107
0.134
0.161		 0.038
0.048
0.058
0.068
0.078
0.092
0.116
0.140		 0.039
0.048
0.054
0.060
0.067
0.075
0.084
0.094		 0.031
0.039
0.045
0.050
0.056
0.064
0.072
0.081		 0.022
0.027
0.032
0.037
0.043
0.050
0.062
0.075		 0.014
0.017
0.021
0.024
0.028
0.032
0.041
0.049		 0.117
0.146
0.174
0.189
0.233
0.250
0.317
0.365		 0.104
0.133
0.161
0.176
0.220
0.237
0.304
0.352		 0.078
0.078
0.106
0.121
0.121
0.136
0.168
0.216		 0.062
0.055
0.083
0.098
0.098
0.113
0.146
0.194		 0.018
0.025
0.029
0.030
0.030
0.032
0.053
0.061		 1
2
2
2
3
3
4
4
Slotted Fillister Head Machine Screws Fillister Head
Machine Screws		 Phillips Fillister Head Machine Screws
SLOTTED PHILLIPS
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Nominal
Size		 A H O J T M G N Phillips
Driver
Size
Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess
Side Height Total Height Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
2
3
4
5
6
8
10
12
1/4
5/16
3/8		 .140
.161
.183
.205
.226
.270
.313
.357
.414
.518
.622		 .124
.145
.166
.187
.208
.250
.292
.334
.389
.490
.590		 .062
.070
.079
.088
.096
.113
.130
.148
.170
.211
.253		 .053
.061
.069
.078
.086
.102
.118
.134
.155
.194
.233		 .083
.095
.107
.120
.132
.156
.180
.205
.237
.295
.355		 .066
.077
.088
.100
.111
.133
.156
.178
.207
.262
.315		 .031
.035
.039
.043
.048
.054
.060
.067
.075
.084
.094		 .023
.027
.031
.035
.039
.045
.050
.056
.064
.072
.081		 .037
.043
.048
.054
.060
.071
.083
.094
.109
.137
.164		 .025
.030
.035
.040
.045
.054
.064
.074
.087
.110
.133		 .104
.112
.122
.143
.166
.182
.199
.259
.281
.322
.389		 .091
.099
.109
.130
.153
.169
.186
.246
.268
.309
.376		 .059
.068
.078
.067
.091
.108
.124
.141
.161
.203
.233		 .017
.019
.019
.027
.028
.030
.031
.034
.036
.042
.065		 1
1
1
2
2
2
2
3
3
3
4
Slotted Flat Head 100¼ Screws Flat Head 100º
Machine Screws		 Phillips Flat Head 100¼ Screws
SLOTTED PHILLIPS
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Nominal
Size		 A H M G N Phillips
Driver
Size
Head Diameter Height
Of
Head
Ref.		 Dimensions of Recess
Max.
Edge
Sharp		 Min.
Edge
Rounded
or Flat		 Diameter Depth Width
Max. Min. Max. Min. Min.
4
6
8
10
14		 0.225
0.279
0.332
0.385
0.507		 0.191
0.238
0.285
0.333
0.442		 0.049
0.060
0.072
0.083
0.110		 0.117
0.154
0.169
0.184
0.247		 0.104
0.141
0.156
0.171
0.234		 0.078
0.086
0.101
0.116
0.135		 0.062
0.063
0.078
0.093
0.112		 0.018
0.027
0.028
0.030
0.033		 1
2
2
2
3
Hex Head
Hex Washer Head
Hex Washer Head Screws Machine Screws
Tapping Screws
Self Drilling Screws		 Hex Head Screws
SLOTTED SLOTTED
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Nominal
Size		 A W H F U J T
Width
Across
Flats		 Width
Across
Corners		 Height
of
Head		 Diameter
of
Washer		 Thickness
of
Washer		 Width
of
Slot		 Depth
of
Slot
Max. Min. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
4
6
7
8
10
12
14
1/4
5/16
3/8		 .187
.250
.250
.250
.312
.312
.438
.375
.500
.562		 .181
.244
.244
.244
.305
.305
.428
.367
.489
.551		 .202
.272
.272
.272
.340
.340
.409
.409
.545
.614		 .060
.093
.093
.110
.120
.155
.190
.190
.230
.295		 .049
.080
.080
.096
.105
.139
.172
.172
.208
.270		 .243
.328
.328
.348
.414
.432
.520
.520
.676
.780		 .225
.302
.302
.322
.384
.398
.480
.480
.624
.720		 .019
.025
.029
.031
.031
.039
.050
.050
.055
.063		 .011
.015
.017
.019
.019
.022
.030
.030
.035
.037		 .039
.048
.048
.054
.060
.067
.075
.075
.084
.094		 .031
.039
.039
.045
.050
.056
.064
.064
.072
.081		 .042
.053
.062
.074
.080
.103
.111
.111
.134
.168		 .025
.033
.040
.052
.057
.077
.083
.083
100
.131
Slotted Oval Head Screws Oval Head
Machine Screws
Tapping Screws
Wood Screws*		 Phillips Oval Head Screws
SLOTTED PHILLIPS
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Nominal
Size		 A H O J T M G N Phillips
Driver
Size
Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess
Side Height Total Height Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
4
5*
6
8
9*
10
12
14*
1/4		 .225
.252
.279
.332
.358
.385
.438
.491
.507		 .195
.220
.244
.292
.316
.340
.389
.452
.452		 .067
.075
.083
.100
.108
.116
.132
.148
.153		 .054
.062
.069
.084
.091
.098
.112
.127
.131		 .104
.116
.128
.152
.164
.176
.200
.224
.232		 .084
.095
.105
.126
.137
.148
.169
.190
.197		 .039
.043
.048
.054
.054
.060
.067
.075
.075		 .031
.035
.039
.045
.045
.050
.056
.064
.064		 .059
.067
.074
.088
.095
.103
.117
.132
.136		 .049
.055
.060
.072
.078
.084
.096
.108
.112		 .136
.158
.178
.192
.216
.209
.270
.305
.290		 .123
.145
.165
.179
.203
.196
.257
.292
.277		 .094
.085
.105
.119
.144
.137
.152
.188
.173		 .019
.028
.030
.031
.034
.033
.038
.042
.040		 1
2
2
2
2
2-3*
3
3
3
Slotted Pan Head Screws Pan Head
Machine Screws
Tapping Screws
Self Drilling Screws		 Phillips Pan Head Screws
SLOTTED PHILLIPS
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Nominal
Size		 A H H1 J T M G N Phillips
Driver
Size
Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess
Slotted Recessed Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
2
3
4
5
6
7
8
10
12
1/4
5/16
3/8		 .167
.193
.219
.245
.270
.296
.322
.373
.425
.492
.615
.740		 .155
.180
.205
.231
.256
.281
.306
.357
.407
.473
.594
.716		 .053
.060
.068
.075
.082
.089
.096
.110
.125
.144
.178
.212		 .045
.051
.058
.065
.072
.079
.085
.099
.112
.130
.162
.195		 .062
.071
.080
.089
.097
.106
.115
.133
.151
.175
.218
.261		 .053
.062
.070
.079
.087
.096
.105
.122
.139
.162
.203
.244		 .031
.035
.039
.043
.048
.048
.054
.060
.067
.075
.084
.094		 .023
.027
.031
.035
.039
.039
.045
.050
.056
.064
.072
.081		 .031
.036
.040
.045
.050
.054
.058
.068
.077
.087
.106
.124		 .022
.026
.030
.034
.037
.041
.045
.053
.061
.070
.085
.100		 .104
.112
.122
.158
.166
.176
.182
.199
.259
.281
.350
.389		 .091
.099
.109
.145
.153
.163
.169
.186
.246
.268
.337
.376		 .059
.068
.078
.083
.091
.100
.108
.124
.141
.161
.193
.233		 .017
.019
.019
.028
.028
.029
.030
.031
.034
.036
.169
.210		 1
1
1
2
2
2
2
2
3
3
4
4
Slotted Round Head Screws Round Head
Machine Screws
Wood Screws*		 Phillips Round Head Screws
SLOTTED PHILLIPS
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Nominal
Size		 A H J T M G N Phillips
Driver
Size
Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess
Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
2
3
4
5
6
7*
8
9*
10
12
14*
1/4
5/16
3/8
1/2		 .162
.187
.211
.236
.260
.285
.309
.334
.359
.408
.457
.472
.590
.708
.813		 .146
.169
.193
.217
.240
.264
.287
.311
.334
.382
.429
.443
.557
.670
.766		 .069
.078
.086
.095
.103
.111
.120
.128
.137
.153
.170
.175
.216
.256
.355		 .059
.067
.075
.083
.091
.099
.107
.115
.123
.139
.155
.160
.198
.237
.332		 .031
.035
.039
.043
.048
.048
.054
.054
.060
.067
.075
.075
.084
.094
.106		 .023
.027
.031
.035
.039
.039
.045
.045
.050
.056
.064
.064
.072
.081
.091		 .048
.053
.058
.063
.068
.072
.077
.082
.087
.096
.106
.109
.132
.155
.211		 .037
.040
.044
.047
.051
.055
.058
.062
.065
.072
.080
.082
.099
.117
.159		 .100
.109
.118
.154
.162
.170
.178
.186
.195
.249
.265
.268
—
—
—		 .087
.096
.105
.141
.149
.157
.165
.173
.182
.236
.252
.255
—
—
—		 .053
.062
.072
.074
.084
.092
.101
.110
.119
.125
.142
.147
—
—
—		 .017
.018
.019
.027
.027
029
.030
.030
.031
.032
.034
.034
—
—
—		 1
1
1
2
2
2
2
2
2-3*
3
3
3
—
—
—
Truss Head
Machine Screws
Tapping Screws
SLOTTED PHILLIPS
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Nominal
Size		 A H J T M G N Phillips
Driver
Size
Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess
Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
4
6
8
10
1/4
5/16
3/8		 .257
.321
.384
.448
.573
.698
.823		 .241
.303
.364
.425
.546
.666
.787		 .069
.086
102
.118
.150
.183
.215		 .059
.074
.088
103
133
162
.191		 —
.048
.054
.060
.075
.084
.094		 —
.039
.045
.050
.064
.072
.081		 —
.050
.058
.068
.087
.106
.124		 —
.037
.045
.053
.070
.085
.100		 .112
.158
.173
.188
.263
.352
—		 .099
145
.160
.175
.250
.339
—		 .069
.084
.099
.115
.143
.193
—		 .017
.027
.029
.030
.033
.059
—		 1
2
2
2
3
4
—

Head Dimensions

Combination Drive
Pan Head
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G H J A M T F N
Screw
Size		 Head
Dimensions		 Slot
Dimemsions		 Recess
Dimensions		 Driver
Size
Head
Diam.		 Head
Height		 Width Depth Width Depth Max.
Rad		 Min.
Wing
Width		 Recess
Penetration
Max. Min. Max. Min. Max. Min.
0 .116
.104		 .044
.036		 — — — — .067
.054		 .039
.021		 .010 .013 .032 .014 0
1 .142
.130		 .053
.044		 — — — — .074
.061		 .045
.025		 .010 .014 .040 .022 0
2 .167
.155		 .062
.053		 .031 .023 .031 .022 .104
.091		 .059
.041		 .020 .017 .052 .034 1
3 .193
.180		 .071
.062		 .035 .027 .036 .026 .112
.099		 .065
.050		 .020 .019 .061 .043 1
4 .219
.205		 .080
.070		 .039 .031 .040 .030 .122
.109		 .078
.060		 .020 .019 .071 .053 1
5 .245
.231		 .089
.079		 .043 .035 .045 .034 .158
.145		 .083
.057		 .025 .028 .072 .046 2
6 .270
.256		 .097
.087		 .048 .039 .050 .037 .166
.153		 .091
.066		 .025 .028 .080 .055 2
7 .296
.281		 .106
.096		 .048 .039 .054 .041 .176
.163		 .100
.075		 .025 .029 .089 .064 2
8 .322
.306		 .115
.105		 .054 .045 .058 .045 .182
.169		 .108
.082		 .025 .030 .097 .071 2
10 .373
.357		 .133
.122		 .060 .050 .068 .053 .199
.186		 .124
.100		 .025 .031 .113 .089 2
12 .425
.407		 .151
.139		 .067 .056 .077 .061 .259
.246		 .141
.115		 .030 .034 .124 .098 3
1/4 .492
.473		 .175
.162		 .075 .064 .087 .070 .281
.268		 .161
.135		 .030 .036 .144 .118 3
5/16 .615
.594		 .218
.203		 .084 .072 .106 .085 .350
.337		 .193
.169		 .035 .059 .173 .149 4
3/8 .740
.716		 .261
.244		 — — — — .389
.376		 .233
.210		 .035 .065 .213 .190 4
7/16 .863
.838		 .304
.286		 — — — — .413
.400		 .259
.234		 .035 .068 .239 .214 4
1/2 .987
.958		 .348
.327		 — — — — .435
.422		 .280
.255		 .035 .071 .260 .235 4
Pan Head Torx®Drive
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Screw
Size		 Head Dimensions Recess Dimensions
D H R G (Fallaway)
Penetration
Head
Diameter		 Head
Height		 Ref. Gage
Penetration
Max. Min. Max. Min. Min. Max.
4
6
8
10		 .219
.270
.322
.372		 .205
.256
.306
.357		 .080
.097
.115
.133		 .070
.087
.105
.122		 .111
.132
.155
.178		 .035
.045
.055
.070		 .016
.020
.025
.025

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