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ASME B18.6.3 Type 1 Cross Recessed Flat Countersunk

asme-b18-6-3-type-1-cross-recessed-flat-countersunk-head-machine-screws

Dimensions of ASME B18.6.3 Type 1 Cross Recessed Flat Countersunk Head Machine Screws

Nominal Size or Baic Screw DiameterLength, LHead Diameter, AHead Height, H, Ref.Recess Diameter, M, Ref.Recess Depth, T, Ref.Recess Width, N, Ref.Driver SizeRecess Penetration Gaging DepthProtrusion Above Gaging Diameter, FGaging Diameter, G
MaxMinMaxMinMaxMin
01/80.1120.0960.0350.0620.0350.01400.0360.0200.0260.0160.078
11/80.1370.1200.0430.0700.0430.01500.0440.0280.0280.0160.101
21/80.1620.1440.0510.0960.0550.01710.0560.0400.0290.0170.124
31/80.1870.1670.0590.1000.0600.01810.0610.0450.0310.0180.148
43/160.2120.1910.0670.1220.0810.01810.0820.0660.0320.0190.172
53/160.2370.2150.0750.1480.0740.02720.0750.0520.0340.0200.196
63/160.2620.2380.0830.1680.0940.02920.0950.0720.0360.0210.220
81/40.3120.2850.1000.1820.1100.03020.1100.0870.0390.0230.267
105/160.3620.3330.1160.1980.1240.03220.1250.1020.0420.0250.313
123/80.4120.3800.1320.2620.1440.03530.1390.1160.0450.0270.362
1/47/160.4770.4420.1530.2760.1600.03630.1540.1310.0500.0290.424
5/161/20.5970.5560.1910.3580.2050.06140.1960.1740.0570.0340.539
3/89/160.7170.6700.2300.3860.2340.06540.2250.2030.0650.0390.653
7/165/80.7600.7150.2230.4020.2500.06840.2410.2190.0730.0440.690
1/23/40.8150.7650.2230.4180.2650.06940.2560.2340.0810.0490.739
9/16…0.9320.8780.2600.4430.2890.07340.2800.2580.0890.0530.851
5/8…1.0500.9900.2980.5650.3290.07950.3090.2830.0970.0580.962
3/4…1.2851.2150.3720.6280.3930.08750.3730.3470.1120.0671.186

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 shall have undercut heads.
  • Tabulated values determined from formula for maximum H in Appendix A.
  • 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.