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.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Nominal Size or Basic Screw Dia.

No. 1

Nominal Size or Basic Screw Dia. (Decimal)

0.0730 in
Applicable to Screw Types1 1
2
3

Max. Head Dia. (A)

0.118 in

Min. Head Dia. (A)

0.104 in

Max. Head Side Height (H)

0.053 in

Min. Head Side Height (H)

0.045 in

Max. Total Head Height (O)

0.066 in

Min. Total Head Height (O)

0.058 in

Max. Slot Width (J)

0.026 in

Min. Slot Width (J)

0.019 in

Max. Slot Depth (T)

0.031 in

Min. Slot Depth (T)

0.020 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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