• 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

N/A Industrial Fasteners Institute

Specifications

Product

N/A Tapping Screws

Unit of Measure

N/A English

Nominal Size or Basic Screw Dia.

N/A 5/16 in

Nominal Size or Basic Screw Dia. (Decimal)

N/A 0.3125 in

Max. Major Dia. (D)

N/A 0.315 in

Min. Major Dia. (D)

N/A 0.306 in

Max. Minor Dia. (d)

N/A 0.244 in

Min. Minor Dia. (d)

N/A 0.236 in

Ref. Point Dia. (P)

N/A 0.230 in

Max. Point Taper Length (S)

N/A 0.167 in

Min. Point Taper Length (S)

N/A 0.125 in

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

N/A 15/32 in

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

N/A 19/32 in

Codes and Standards

Codes and Standards

N/A ASME B18.6.4 1998

Threads Per Inch

Threads Per Inch

N/A 12
Use trailing wildcard (*) for broader results.