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Wood Screws

Phillips Round Head Wood Screws

Dimensions of Square Head Set Screws

Nominal Size
or Basic Screw
Diameter		 F G H K S U W
Width Across Flats Width Across Corners Head Height Neck Relief Diameter Neck Relief Fillet Radius Neck Relief Width Head Radius
Max Min Max Min Max Min Max Min Max Min Min
No. 10 (0.1900) 0.188 0.180 0.265 0.247 0.148 0.134 0.145 0.140 0.027 0.083 0.48
1/4 (0.2500) 0.250 0.241 0.354 0.331 0.196 0.178 0.185 0.170 0.032 0.1 00 0.62
5/16 (0 .3125) 0.312 0.302 0.442 0.415 0.245 0.224 0.240 0.225 0.036 0.111 0.78
3/8 (0.3750) 0.375 0.362 0.530 0.497 0.293 0.270 0.294 0.279 0.041 0.125 0.94
7/16 (0.4375) 0.438 0.423 0.619 0.581 0.341 0.315 0.345 0.330 0.046 0.143 1.09
1/2 (0.5000) 0.500 0.484 0.707 0.665 0.389 0.361 0.400 0.385 0.050 0.154 1.25
9/16 (0.5625) 0.562 0.545 0.795 0.748 0.437 0.407 0.454 0.439 0.054 0.167 1.41
5/8 (0.6250) 0.625 0.606 0.884 0.833 0.485 0.452 0.507 0.492 0.059 0.182 1.56
3/4 (0.7500) 0.750 0.729 1.060 1.001 0.582 0.544 0.620 0.605 0.065 0.200 1.88
7/8 (0.8750) 0.875 0.852 1.237 1.170 0.678 0.635 0.731 0.716 0.072 0.222 2.19
1 (1.0000) 1.000 0.974 1.414 1.337 0.774 0.726 0.838 0.823 0.081 0.250 2.50
1-1/8 (1 .1250) 1.125 1.096 1.591 1.505 0.870 0.817 0.939 0.914 0.092 0.283 2.81
1-1/4 (1 .2500) 1.250 1.219 1.768 1.674 0.966 0.908 1.064 1.039 0.092 0.283 3.12
1-3/8 (1 .3750) 1.375 1.342 1.945 1.843 1.063 1.000 1.159 1.134 0.109 0.333 3.44
1-1/2 (1.5000) 1.500 1.464 2.121 2.010 1.159 1.091 1.284 1.259 0.109 0.333 3.75