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Hex Flange Screws

ASME B 18.2.1 - 2010

Display drawing:

Screw Thread 5/16 3/8 7/16 1/2 9/16 5/8 3/4 1/4
Thread Size 5/16 3/8 7/16 1/2 9/16 5/8 3/4 1/4
D 0.3125 0.375 0.4375 0.5 0.5625 0.625 0.75 0.25
PP UNC 18 16 14 13 12 11 10 20
PP UNF 24 24 20 20 18 18 16 28
Ds Max 0.3125 0.375 0.4375 0.5 0.5625 0.625 0.75 0.25
Ds Min 0.3065 0.369 0.4305 0.493 0.5545 0.617 0.741 0.245
S Basic 1/2 9/16 5/8 3/4 13/16 15/16 1-1/8 3/8
S Max 0.5 0.5625 0.625 0.75 0.8125 0.9375 1.125 0.375
S Min 0.489 0.551 0.612 0.736 0.798 0.922 1.1 0.367
E Max 0.577 0.65 0.722 0.866 0.938 1.083 1.299 0.433
E Min 0.548 0.618 0.685 0.825 0.895 1.034 1.234 0.409
Dc Max 0.68 0.81 0.93 1.07 1.19 1.33 1.59 0.56
C Min 0.05 0.06 0.07 0.08 0.09 0.1 0.11 0.04
K Max 0.32 0.39 0.46 0.51 0.57 0.62 0.73 0.28
B L≤6 0.875 1 1.125 1.25 1.375 1.5 1.75 0.75
B L＞6 1.125 1.25 1.375 1.5 1.625 1.75 2 1
R Max 0.025 0.025 0.025 0.025 0.045 0.045 0.045 0.025
R Min 0.025 0.025 0.025 0.025 0.020 0.020 0.020 0.015