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Applicable to screw types as indicated by code symbols.
  • Type AB thread forming.
  • Type A thread forming, except for short lengths.
  • Types B and BP thread forming and Types BF and BT thread cutting.
  • Type C thread forming and Types D, F, G, and T thread cutting.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Nominal Size or Basic Screw Dia.

No. 6

Nominal Size or Basic Screw Dia. (Decimal)

0.1380 in

Head Size

4
Applicable to Screw Types1 1
2
3
4

Ref. Recess Dia. (M)

0.151 in

Ref. Recess Depth (T)

0.082 in

Ref. Recess Width (N)

0.032 in

Driver Size

Point Same on all Drivers

Max. Recess Penetration Gaging Depth

0.064 in

Min. Recess Penetration Gaging Depth

0.052 in

Max. Protrusion Above Gaging Dia. (F)

0.069 in

Min. Protrusion Above Gaging Dia. (F)

0.048 in

Gaging Dia. (G)

0.172 in

Codes and Standards

Codes and Standards

Abstract of ASME B18.6.4 1998
  • 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square