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  • Threads within point taper length shall have unfinished crests.
  • The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No. 8, and 0.006 in. for larger sizes.
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • For determining the effective grip length of BP screws.
Unit of Measure

Manufacturer

Manufacturer

Industrial Fasteners Institute

Specifications

Product

Tapping Screws

Unit of Measure

English

Nominal Size or Basic Screw Dia.

3/8 in

Nominal Size or Basic Screw Dia. (Decimal)

0.3750 in

Max. Major Dia. (D)

0.38 in

Min. Major Dia. (D)

0.371 in

Max. Minor Dia. (d)

0.309 in

Min. Minor Dia. (d)

0.299 in

Ref. Point Dia. (P)

0.293 in

Max. Point Taper Length (S)

0.167 in

Min. Point Taper Length (S)

0.125 in

Min. Practical Nominal Screw Lengths for 90ยบ Heads (L)

17/32 in

Min. Practical Nominal Screw Lengths for Csk Heads (L)

11/16 in

Codes and Standards

Codes and Standards

ASME B18.6.4 1998

Threads Per Inch

Threads Per Inch

12