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SEMS

 

Pan Head Sems Pan Head
Machine Screws
Tapping Screws
Self Drilling Screws		 Pan Head Sems
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

 

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 Screw Sems

 

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 Sems

 

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
Sems

 

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 Sems

 

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
Wood Screw Sems

 

 

Lock Washers For Sems

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  Lock Washers for Sems   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
  Lock Washers for Sems  
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