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ASME B18.6.3 Type 2 Cross Recessed Undercut Oval Countersunk

Dimensions of ASME B18.6.3 Type 2 Cross Recessed Undercut Oval Countersunk Head Machine Screws

Dimensions of ASME B18.6.3 Type 2 Cross Recessed Undercut Oval Countersunk Head Machine Screws

Nominal Size or Basic Screw DiameterLength, LHead Diameter, AHead Side Height, HHead Crown Height, CTotal Head Height, ORecess Diameter, MRecess Depth, TRecess Width, NDriver SizeRecess Penetration Gaging DepthProtrusion Above Gaging Diameter, FGaging Diameter, G
MaxMinMaxMinMaxMinMaxMin
01/80.1120.0960.0250.0210.0460.0330.0670.0290.020 Note 6Note 60.0470.0310.078
11/80.1370.1200.0310.0250.0560.0420.0820.0390.022 Note 6Note 60.0530.0350.101
21/80.1620.1440.0360.0290.0650.0500.1000.0500.025 0.0300.0200.0580.0390.124
31/80.1870.1670.0420.0330.0750.0590.1110.0580.026 0.0380.0270.0640.0440.148
43/160.2120.1910.0470.0370.0840.0670.1290.0700.029 0.0500.0380.0690.0480.172
53/160.2370.2150.0530.0410.0940.0760.1470.0800.032 0.0620.0500.0750.0530.196
63/160.2620.2380.0590.0450.1040.0840.1610.0880.034 0.0710.0590.0800.0570.220
81/40.3120.2850.0700.0520.1230.1010.1970.1120.039 0.0950.0820.0910.0660.267
105/160.3620.3330.0810.0600.1420.1180.2360.1320.045 0.1210.1070.1020.0750.313
123/80.4120.3800.0920.0680.1610.1350.2600.1480.048 0.1370.1220.1130.0840.362
1/47/160.4770.4420.1070.0790.1860.1580.3040.1690.054 0.1670.1500.1290.0950.424
5/161/20.5970.5560.1340.0990.2320.1980.3810.2180.066 0.2180.1980.1550.1170.539
3/89/160.7170.6700.1610.1170.2780.2390.4530.2660.077 0.2660.2440.1820.1390.653
7/165/80.7600.7150.1560.1220.2790.2390.4980.2950.083 0.2960.2730.1950.1500.690
1/23/40.8150.7650.1560.1310.2880.2440.5480.3280.090 0.3290.3050.2120.1630.739

Notes :

  • Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.
  • Screws of these length and shorter are undercut. Screws of longer lengths shall have head heights.
  • Tabulated values determined from formula for maximum H in Appendix A.
  • Point same on all drivers.
  • No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected accordingly and the proper protusion values must be recalculated using the formulas.
  • Not practical to gage.