Dimensions of ASME B18.6.3 Type 1 Cross Recessed Round Washer Head Machine Screws

Dimensions of ASME B18.6.3 Type 1 Cross Recessed Round Washer Head Machine Screws

Nominal Size or Basic Screw DiameterCrown Diameter, AHead Height, HWasher Diameter, BWasher Thickness, URecess Diameter, MRecess Depth, TRecess Width, NDriver SizeRecess Penetration Gaging Depth
MaxMinMaxMinMaxMin
20.1360.0620.0500.2020.1860.0300.0990.0410.01810.0460.021
30.1560.0700.0580.2320.2150.0300.1070.0520.01910.0560.033
40.1770.0790.0670.2610.2430.0300.1160.0620.01910.0650.044
50.1980.0880.0750.2910.2720.0400.1390.0520.02620.0540.026
60.2180.0960.0840.3210.3010.0400.1470.0580.02620.0610.033
80.2590.1130.1010.3800.3580.0400.1610.0730.02820.0760.048
100.3000.1300.1180.4390.4160.0500.1770.0910.02920.0930.066
120.3410.1480.1340.4980.4730.0500.2280.0970.03030.0940.066
1/40.3960.1700.1570.5760.5480.0500.2440.1100.03230.1070.080
5/160.4940.2110.1970.7190.6870.0600.2920.1600.03830.1560.129
3/80.5930.2530.2380.8610.8250.0600.3480.1770.05840.1700.144
7/160.6910.2940.2781.0040.9630.0700.3660.1980.06140.1900.165
1/20.7900.3350.3191.1461.1010.0900.3830.2170.06340.2100.184

Notes :

  • Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.