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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.
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Type

Type IA

Nominal Size or Basic Screw Dia.

No. 7

Nominal Size or Basic Screw Dia. (Decimal)

0.1510 in
Applicable to Screw Types1 1
2
3

Max. Head Dia. (A)

0.296 in

Min. Head Dia. (A)

0.281 in

Max. Head Height (H)

0.106 in

Min. Head Height (H)

0.096 in

Min. Head Radius (R)

0.015 in

Ref. Recess Dia. (M)

0.164 in

Ref. Recess Depth (T)

0.092 in

Ref. Recess Width (N)

0.041 in

Driver Size

2

Max. Recess Penetration Gaging Depth

0.085 in

Min. Recess Penetration Gaging Depth

0.067 in

Codes and Standards

Codes and Standards

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