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

5
Applicable to Screw Types1 1
2
3
4

Max. Head Dia. (A)

0.237 in

Min. Head Dia. (A)

0.215 in

Ref. Head Side Height (H)

0.075 in

Ref. Head Crown Height (C)

0.041 in

Ref. Total Head Height (O)

0.112 in

Ref. Head Radius (R)

0.019 in

Min. Shoulder Dia. for Type A Long Screws (E)

0.131 in

Min. Shoulder Dia. for Other Types Long Screws (E)

0.131 in

Codes and Standards

Codes and Standards

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