ASME B18.6.3 Type 1A Cross Recessed Binding Head Machine Screws

Dimensions of ASME B18.6.3 Type 1A Cross Recessed Binding Head Machine Screws

Nominal Size or Basic Screw DiameterHead Diameter, ATotal Head Height, OHead Oval Height, FRecess Diameter, MRecess Depth, TRecess Width, NDriver SizeRecess Penetration Gaging Depth
MaxMinMaxMinMaxMinMaxMin
00.1260.1190.0320.0260.0120.0080.0600.0340.01800.0340.018
10.1530.1450.0410.0350.0150.0110.0670.0410.01800.0430.027
20.1810.1710.0500.0430.0180.0130.0970.0570.02910.0540.038
30.2080.1970.0590.0520.0220.0160.1020.0620.02910.0590.043
40.2350.2230.0680.0610.0250.0180.1100.0700.02910.0680.052
50.2630.2490.0780.0690.0290.0210.1370.0660.04020.0590.041
60.2900.2750.0870.0780.0320.0240.1490.0780.04020.0720.054
80.3440.3260.1050.0950.0390.0290.1740.1040.04120.0970.079
100.3990.3780.1230.1120.0450.0340.1920.1220.04120.1150.097
120.4540.4300.1410.1300.0520.0390.2530.1380.05630.1250.107
1/40.5250.4980.1650.1520.0610.0460.2670.1520.05730.1390.121
5/160.6560.6220.2090.1940.0770.0590.3320.1810.08640.1630.145
3/80.7880.7460.2530.2350.0940.0710.3800.2310.08640.2130.195
Notes :
  • Break sharp edge on head where spherical and conical surfaces meet.
  • Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.