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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

Min. Shoulder Dia. for Type A (E)

0.131 in

Min. Shoulder Dia. for Other Types (E)

0.131 in

Max. Head Dia. (A)

0.212 in

Min. Head Dia. (A)

0.191 in

Ref. Head Height (H)

0.052 in

Max. Protrusion Above Gaging Dia. (F)

0.032 in

Min. Protrusion Above Gaging Dia. (F)

0.019 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