Dimensions of ASME B18.6.3 Combination Slotted Type 1A Cross Recessed Pan Head Machine Screws

Dimensions of ASME B18.6.3 Combination Slotted Type 1A Cross Recessed Pan Head Machine Screws

Nominal Size or Basic Screw DiameterHead Diameter, AHead Height, HHead Radius, RSlot Width, WSlot Depth, DRecess Diameter, MRecess Depth, TRecess Width, NDriver SizeRecess Penetration Gaging Depth, P
MaxMinMaxMinMaxMinMaxMinMaxMin
00.1160.1040.0440.0360.0050.0230.0160.0220.0130.0600.0320.01800.0330.017
10.1420.1300.0530.0440.0050.0260.0190.0270.0170.0670.0390.01800.0400.024
20.1670.1550.0620.0530.0100.0310.0230.0310.0200.0970.0560.02810.0530.037
30.1930.1800.0710.0620.0100.0350.0270.0360.0230.1050.0650.02910.0620.046
40.2190.2050.0800.0700.0100.0390.0310.0400.0270.1150.0750.02910.0720.056
50.2450.2310.0890.0790.0150.0430.0350.0450.0300.1470.0750.04020.0680.050
60.2700.2560.0970.0870.0150.0480.0390.0500.0330.1550.0830.04020.0760.058
80.3220.3060.1150.1050.0150.0540.0450.0580.0410.1700.0990.04120.0920.074
100.3730.3570.1330.1220.0200.0600.0500.0680.0480.1850.1150.04120.1080.090
120.4250.4070.1510.1390.0250.0670.0560.0770.0550.2470.1300.05630.1170.099
1/40.4920.4730.1750.1620.0350.0750.0640.0870.0630.2660.1500.05730.1370.119
5/160.6150.5940.2180.2030.0400.0840.0720.1060.0760.3340.1820.08640.1640.146
3/80.7400.7160.2610.2440.0400.0940.0810.1240.0900.3700.2190.08640.2010.183
7/160.8630.8380.3040.2860.0500.0940.0810.1420.1050.3920.2420.08640.2240.206
1/20.9870.9580.3480.3270.0550.1060.0910.1610.1180.4130.2640.08640.2460.228

Notes :

  • Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.
  • Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10% lower than slotted pan heads.