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SELF TAPPING SCREWS

 

Drive Screws Type U

Round Head

 Round Head Self Tapping Screw
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Nominal
Screw
Size		 Number
Of Thread
Starts		 D A H P Recommened
Hole Size
Outside
Diameter		 Head
Diameter		 Head
Height		 Pilot
Diameter		 Drill Size
No.		 Hole
Diameter
Max. Min. Max. Min. Max. Min. Max. Min.
00
0
2
4		 6
6
8
7		 0.060
0.075
0.100
0.116		 0.057
0.072
0.097
0.112		 0.099
0.127
0.162
0.211		 0.090
0.118
0.146
0.193		 0.034
0.049
0.069
0.086		 0.026
0.041
0.059
0.075		 0.049
0.063
0.083
0.096		 0.046
0.060
0.080
0.092		 55
51
44
37		 0.052
0.067
0.086
0.104
6
7
8
10		 7
8
8
8		 0.140
0.154
0.167
0.182		 0.136
0.150
0.162
0.177		 0.260
0.285
0.309
0.359		 0.240
0.264
0.287
0.334		 0.103
0.111
0.120
0.137		 0.091
0.099
0.107
0.123		 0.116
0.126
0.136
0.150		 0.112
0.122
0.132
0.146		 31
29
27
20		 0.120
0.136
0.144
0.161
12
14		 8
9		 0.212
0.242		 0.206
0.236		 0.408
0.457		 0.382
0.429		 0.153
0.170		 0.139
0.155		 0.177
0.202		 0.173
0.198		 11
2		 0.191
0.221
 
L Nominal
Screw Length		 1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4 1 in. and
over
S Pilot Length 0.047 0.047 0.047 0.047 0.062 0.062 0.078 0.078 0.125

 

Flat Head Self Tapping Screw Flat Head 100º
Machine Screws		 Flat Head Self Tapping Screw
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

Square Drive Self tapping Screw Square Drive Flat Head Square Drive Self tapping Screw
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This type of recess has a squam center opening slightly tapered side walls and a conical bottom.

Nominal Size or Basic Screw Diameter M
Recess
Square		 T
Recess
Depth		 Drive
Size		 F
Penetration
Gauging Depth
Max Min. Min. Max.   Max. Min.
3 0.0990
4 0.1120
5 0.1250
6 0.1380
7 0.1510
8 0.1640
10 0.1900
12 0.2160
1/4 0.2500
5/16 0.3125
3/8 0.3750
0.071
0.071
0.091
0.091
0.091
0.1126
0.1126
0.133
0.133
0.191
0.191		 0.0696
0.0696
0.090
0.090
0.090
0.111
0.111
0.1315
0.1315
0.1895
0.1895		 0.073
0.073
0.113
0.113
0.113
0.140
0.140
0.165
0.165
0.201
0.201		 0.063
0.063
0.105
0.105
0.105
0.119
0.119
0.155
0.155
0.191
0.191		 0
0
1
1
1
2
2
3
3
4
4		 0.038
0.038
0.065
0.065
0.065
0.075
0.075
0.095
0.095
0.100
0.100		 0.032
0.032
0.057
0.057
0.057
0.065
0.065
0.085
0.085
0.090
0.090

 

Hex Head
Hex Washer Head
Hex Washer Head Self Tapping Screw Machine Screws
Tapping Screws
Self Drilling Screws		 Hex Head Self Tapping Screw
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

 

Oval Head Self Tapping Screw Oval Head
Machine Screws
Tapping Screws
Wood Screws*		 Oval Head Self Tapping Screw
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

 

Pan Head Self Tapping Screw Pan Head
Machine Screws
Tapping Screws
Self Drilling 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

 

Head Dimensions

Combination Drive Self Tapping Screw 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

 

 

Square Drive Self Tapping Screw

Square Drive Pan Head

Self Tapping Screws
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This type of recess has a square center opening, slightly tapered side walls and a conical bottom.

Nominal
Size or Basic Screw
Diameter		 H R M T Driver
Size		 P
Head
Height		 Head
Radius		 Recess
Square		 Recess
Depth		 Penetration
Gauging Depth
Max Min Min Max Min Max Min Max Min
3 0.0990
4 0.1120
5 0.1250
6 0.1380
0.078
0.086
0.095
0.103		 0.067
0.075
0.083
0.091		 0.010
0.010
0.015
0.015		 0.071
0.071
0.091
0.091		 0.0696
0.0696
0.090
0.090		 0.073
0.073
0.113
0.113		 0.063
0.063
0.105
0.105		 0
0
1
1		 0.038
0.038
0.065
0.065		 0.032
0.032
0.057
0.057
7 0.1510
8 0.1640
10 0.1900
12 0.2160
0.111
0.120
0.137
0.153		 0.099
0.107
0.123
0.139		 0.015
0.015
0.020
0.025		 0.091
0.112
0.112
0.133		 0.090
0.111
0.111
0.1315		 0.113
0.140
0.140
0.165		 0.105
0.119
0.119
0.155		 1
2
2
3		 0.065
0.075
0.075
0.095		 0.057
0.065
0.065
0.085
1/4 0.2500
5/16 0.3125
3/8 0.3750
0.175
0.216
0.256		 0.160
0.198
0.237		 0.035
0.040
0.040		 0.133
0.191
0.191		 0.1315
0.1895
0.1895		 0.165
0.201
0.201		 0.155
0.191
0.191		 3
4
4		 0.095
0.100
0.100		 0.085
0.090
0.090

 

 

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

 

 

Truss Head Self Tapping Screw 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
--

Threads and Points for Thread Cutting Screws and Self-Tapping Screws

Type F
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Nominal Size or
Basic Screw Diameter		 Threads
per
Inch		 D P S L
Major
Diameter		 Point
Diameter		 Point Taper Length Determinant
Length for
Point Taper		 Minimum Practical
Screw Length
For Short Screws For Long Screws
Max. Min. Max. Min. Max. Min. Max. Min. 90°
Heads		 Csk Heads 90°
Heads		 Csk Heads
2 0.0860
4 0.1120
6 0.1380
56
40
32		 0.0860
0.1120
0.1380		 0.0813
0.1061
0.1312		 0.068
0.087
0.107		 0.061
0.078
0.096		 0.062
0.088
0.109		 0.045
0.062
0.078		 0.080
0.112
0.141		 0.062
0.088
0.109		 5/32
7/32
1/4		 3/16
1/4
5/16		 5/32
3/16
1/4		 3/16
1/4
5/16
8 0.1640
10 0.1900
10 0.19000
32
24
32		 0.1640
0.1900
0.1900		 0.1571
0.1818
0.1831		 0.132
0.148
0.158		 0.122
0.135
0.148		 0.109
0.146
0.109		 0.078
0.104
0.078		 0.141
0.188
0.141		 0.109
0.146
0.109		 1/4
11/32
1/4		 11/32
7/16
11/32		 1/4
5/16
1/4		 5/16
13/32
5/16
12 0.2160
14 0.2500
5/16 0.3125
3/8 0.3750
24
20
18
16		 0.2160
0.2500
0.3125
0.3750		 0.2078
0.2408
0.3026
0.3643		 0.174
0.200
0.257
0.312		 0.161
0.184
0.239
0.293		 0.146
0.175
0.194
0.219		 0.104
0.125
0.139
0.156		 0.188
0.225
0.250
0.281		 0.146
0.175
0.194
0.219		 11/32
13/32
15/32
1/2		 7/16
17/32
19/32
11/16		 5/16
3/8
7/16
15/32		 13/32
1/2
9/16
5/8

 

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

 

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 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 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

 

Wood Screws Click here to Request 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



Threads For Self Tappings Screws

Type A
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Nominal Size or
Basic Screw Diameter		 Threads
per Inch		 D d L
Major
Diameter		 Minor
Diameter		 These Lengths or Shorter Have AB Threads
Max. Min. Max. Min. 90°
Heads		 Csk
Heads
6 0.139
7 0.155
8 0.165
10 0.192
12 0.218
14 0.252
20 0.330
24 0.385
18
16
15
12
11
10
9
9		 0.141
0.158
0.168
0.194
0.221
0.254
0.333
0.390		 0.136
0.152
0.162
0.188
0.215
0.248
0.327
0.383		 0.102
0.114
0.123
0.133
0.162
0.185
0.234
0.291		 0.096
0.108
0.116
0.126
0.155
0.178
0.226
0.282		 1/4
5/16
3/8
3/8
7/16
1/2
11/16
3/4		 5/16
3/8
7/16
1/2
9/16
5/8
13/16
1

 

Type AB
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Nominal Size or
Basic Screw Diameter		 Threads
per Inch		 D d L
Major
Diameter		 Minor
Diameter		 These Lengths or Shorter Have AB Threads
Max. Min. Max. Min. 90°
Heads		 Csk
Heads
4 0.1120
6 0.1380
8 0.1640
10 0.1900
12 0.2160
1/4 0.2500
5/16 0.3125
3/8 0.3750
24
20
18
16
14
14
12
12		 0.114
0.139
0.188
0.189
0.215
0.246
0.315
0.380		 0.110
0.135
0.161
0.183
0.209
0.240
0.306
0.371		 0.086
0.104
0.122
0.141
0.164
0.192
0.244
0.309		 0.082
0.099
0.116
0.135
0.157
0.185
0.236
0.299		 3/16
7/32
9/32
21/64
3/8
13/32
5/8
3/8		 7/32
17/64
21/64
3/8
13/32
15/32
3/4
29/32

 

Type 25
Click here to Request a quote. 		Type B
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Nominal Size or
Basic Screw Diameter		 Threads
per
Inch		 D d P S L
Major
Diameter		 Minor
Diameter		 Point
Diameter		 Point Taper Length Determinant
Length for
Point Taper		 Minimum Practical
Screw Length
For Short Screws For Long Screws
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. 90°
Heads		 Csk Heads 90°
Heads		 Csk Heads
2 0.0860
4 0.1120
6