• Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Head dimensions not shown are the same as those of slotted heads
  • Not practical to gage sizes No. 0 and No. 1.
This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Type

Type II

Nominal Size or Basic Screw Dia.

No. 20

Nominal Size or Basic Screw Dia. (Decimal)

0.3200 in

Ref. Recess Dia. (M)

0.442 in

Ref. Recess Depth (T)

0.258 in

Ref. Recess Width (N)

0.075 in

Driver Size

Point Same on all Drivers

Max. Recess Penetration Gaging Depth

0.258 in

Min. Recess Penetration Gaging Depth

0.238 in

Codes and Standards

Codes and Standards

Abstract of ASME B18.6.4 1998
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