• Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
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

N/A Industrial Fasteners Institute

Specifications

Product

N/A Tapping Screws

Unit of Measure

N/A English

Type

N/A Type IA

Nominal Size or Basic Screw Dia.

N/A No. 8

Nominal Size or Basic Screw Dia. (Decimal)

N/A 0.1640 in

Ref. Recess Dia. (M)

N/A 0.158 in

Ref. Recess Depth (T)

N/A 0.088 in

Ref. Recess Width (N)

N/A 0.041 in

Driver Size

N/A 2

Max. Recess Penetration Gaging Depth

N/A 0.081 in

Min. Recess Penetration Gaging Depth

N/A 0.063 in

Codes and Standards

Codes and Standards

N/A Abstract of ASME B18.6.4 1998
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