SEMS

 

Pan Head
Machine Screws
Tapping Screws
Self Drilling Screws
SLOTTED   PHILLIPS
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

 

Machine Screws

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
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
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
Nominal Screw Length Tolerance on Length
Up to 3/8 in., Incl.
Over 3/8 in.		 + 0.02
+ 0.03

 

Wood Screws
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

 

 

Lock Washers For Sems

   
Nominal
Size or Basic Screw		 INTERNAL TOOTH EXTERNAL TOOTH
Washer
Thickness		 Washer
Outside
Diameter		 Washer
Thickness		 Washer
Outside
Diameter
Max Min Max Min Max Min Max Min
2 0.0860
4 0.1120
6 0.1380
8 0.1640
10 0.1900
0.016
0.019
0.021
0.023
0.025		 0.010
0.015
0.017
0.018
0.020		 0.185
0.268
0.288
0.338
0.383		 0.175
0.258
0.278
0.327
0.327		 0.016
0.020
0.020
0.023
0.024		 0.010
0.012
0.014
0.018
0.018		 0.180
0.230
0.285
0.320
0.381		 0.170
0.220
0.270
0.305
0.365
   
Nominal Size or Basic Screw SPLIT LOCK SQUARE CONICAL
Washer
Thickness		 Washer
Outside
Diameter		 Washer
Thickness		 Washer
Outside
Diameter
Max Min Max Min Max Min Max Min
4 0.1120
6 0.1380
8 0.1640
10 0.1900
0.031
0.040
0.047
0.056		 0.025
0.031
0.040
0.047		 0.208
0.261
0.319
0.373		 0.195
0.248
0.305
0.359		 0.015
0.025
0.030
0.032		 0.007
0.019
0.025
0.026		 0.250
0.320
0.383
0.446		 0.244
0.307
0.370
0.433

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