Dimensions of ASME B18.6.3 Recess Flat Countersunk Head Screws

Dimensions of ASME B18.6.3 Recess Flat Countersunk Head Screws

Type 1Type 1AType 3Type 4
Nominal Size or Basic Screw DiameterRecess Dia, M, RefDriver SizeRecess Penetration Gaging Depth, PRecess Dia, M, RefDriver SizeRecess Penetration Gaging Depth, PAcross Flats M, RefDriver SizeRecess Penetration Gaging Depth, PRecess Dia, M, RefDriver SizeRecess Penetration Gaging Depth, PFallaway
MaxMinMaxMinMaxMinMaxMinMax
00.06200.0360.0200.06200.0370.021
10.07000.0440.0280.07000.0450.0290.058T50.0170.0120.010
20.09610.0560.0400.09610.0530.0370.05000.0330.0280.069T60.0220.0170.014
30.10010.0610.0450.10010.0580.0420.07000.0380.0280.094T80.0250.0200.019
40.12210.0820.0660.12210.0790.0630.07000.0380.0280.094T80.0330.0280.019
50.14820.0750.0520.14820.0710.0530.0911S0.0550.0400.111T100.0450.0350.022
60.16820.0950.0720.16820.0910.0730.0911S0.0550.0400.111T100.0450.0350.022
70.17620.1030.0800.17620.0990.0810.0911R0.0650.0500.132T150.0450.0350.022
80.18220.1100.0870.18220.1070.0890.1122S0.0630.0480.132T150.0510.0400.026
100.19820.1250.1020.19820.1220.1040.1122R0.0750.0600.155T200.0650.0500.031
120.26230.1390.1160.26230.1360.1180.1333R0.0950.0800.178T250.0700.0550.036
140.27630.1540.1310.27630.1510.1330.1333R0.0950.0800.200T270.0800.0650.040
                  
1/40.27630.1540.1310.27630.1510.1330.1333R0.0950.0800.200T270.0900.0750.040
160.29630.1740.1510.29630.1710.1530.1333R0.0950.0800.221T300.0700.0550.042
180.35840.1960.1740.35840.1930.1750.1914R0.1000.0850.211T300.0900.0750.042
5/160.35840.1960.1740.35840.1930.1750.1914R0.1000.0850.266T400.1050.0870.047
200.37240.2100.1880.37240.2060.1880.1914R0.1000.0850.266T400.1150.0950.047
240.38640.2250.2030.38640.2220.2040.1914R0.1000.0850.266T400.1250.1050.047
3/80.38640.2250.2030.38640.2220.2040.1914R0.1000.0850.266T400.1350.1150.047
7/160.40240.2410.2190.40240.2380.2200.352T500.1250.1050.062
1/20.41840.2560.2340.41840.2530.2350.352T500.1350.1200.062
9/160.44340.2800.2580.44040.2760.2580.446T550.1600.1400.078
5/80.56550.3090.2830.56650.3070.2860.446T550.1600.1400.078
3/40.62850.3730.3470.63050.3720.3510.529T600.2300.2050.093