• 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 No. 12

Nominal Size or Basic Screw Dia. (Decimal)

N/A 0.2160 in

Max. Major Dia. (D)

N/A 0.215 in

Min. Major Dia. (D)

N/A 0.208 in

Max. Minor Dia. (d)

N/A 0.164 in

Min. Minor Dia. (d)

N/A 0.157 in

Ref. Point Dia. (P)

N/A 0.152 in

Max. Point Taper Length (S)

N/A 0.143 in

Min. Point Taper Length (S)

N/A 0.107 in

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

N/A 9/16 in

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

N/A 21/32 in

Codes and Standards

Codes and Standards

N/A ASME B18.6.4 1998

Threads Per Inch

Threads Per Inch

N/A 14
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