|
Dimensions of Lobed Head Screws
|
||||||||||
|
Maximum
Minor Diam., B |
Drive
Size |
|||||||||
|
Nominal Size
or Basic Product Diameter of Thread |
Width Across Corners, G
|
Head Height, H
|
Flange Thickness, K
|
Flange Diam., C
|
||||||
|
Reference
|
Max.
|
Min.
|
Max.
|
Min.
|
Max.
|
Min.
|
||||
|
1/4
|
0.2500
|
0.287
|
0.255
|
0.245
|
0.07
|
0.06
|
0.375
|
0.365
|
0.2073
|
E8
|
|
5/16
|
0.3125
|
0.362
|
0.323
|
0.313
|
0.1
|
0.09
|
0.469
|
0.457
|
0.2663
|
E10
|
|
3/8
|
0.3750
|
0.431
|
0.394
|
0.384
|
0.125
|
0.115
|
0.562
|
0.55
|
0.3103
|
E12
|
|
7/16
|
0.4375
|
0.499
|
0.472
|
0.462
|
0.155
|
0.145
|
0.656
|
0.642
|
0.3613
|
E14
|
|
1/2
|
0.5000
|
0.571
|
0.515
|
0.505
|
0.16
|
0.15
|
0.75
|
0.735
|
0.4113
|
E16
|
|
9/16
|
0.5625
|
0.645
|
0.551
|
0.541
|
0.165
|
0.153
|
0.844
|
0.828
|
0.4663
|
E18
|
|
5/8
|
0.6250
|
0.715
|
0.63
|
0.62
|
0.2
|
0.188
|
0.938
|
0.921
|
0.5183
|
E20
|
|
3/4
|
0.7500
|
0.86
|
0.787
|
0.777
|
0.255
|
0.243
|
1.125
|
1.107
|
0.6183
|
E24
|
|
7/8
|
0.8750
|
1
|
0.866
|
0.856
|
0.27
|
0.26
|
1.312
|
1.293
|
0.7193
|
E28
|
|
1
|
1.0000
|
1.138
|
1.063
|
1.053
|
0.355
|
0.343
|
1.5
|
1.479
|
0.8393
|
E32
|
|
1 1/8
|
1.1250
|
1.28
|
1.181
|
1.171
|
0.382
|
0.37
|
1.688
|
1.665
|
0.9433
|
E36
|
|
1 1/4
|
1.2500
|
1.42
|
1.299
|
1.289
|
0.422
|
0.41
|
1.875
|
1.852
|
1.0463
|
E40
|
|
1 3/8
|
1.3750
|
1.562
|
1.417
|
1.407
|
0.453
|
0.441
|
2.062
|
2.038
|
1.1513
|
E44
|