• No extrusion of excess metal beyond apex of the point resulting from thread rolling shall be permissible. A slight rounding or truncation of the point is desirable.
  • 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.
  • Sizes shown in boldface type are preferred.
  • For determining the effective grip length of Type AB screws.
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Item #

Description

Nominal Size or Basic Screw Dia.

Threads Per Inch

Max. (D)

Max. (d)

L for 90° Heads

L for Csk Heads

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N/A Thread Forming Tapping Screw Type AB, with 0.4375" Nominal Dia. N/A 7/16 in N/A 10 N/A 0.44 in N/A 0.359 in N/A 7/8 in N/A 1-1/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.5000" Nominal Dia. N/A 1/2 in N/A 10 N/A 0.504 in N/A 0.423 in N/A 1 in N/A 1-5/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.3125" Nominal Dia. N/A 5/16 in N/A 12 N/A 0.315 in N/A 0.244 in N/A 5/8 in N/A 3/4 in
N/A Thread Forming Tapping Screw Type AB, with 0.3750" Nominal Dia. N/A 3/8 in N/A 12 N/A 0.38 in N/A 0.309 in N/A 3/4 in N/A 29/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.2160" Nominal Dia. N/A No. 12 N/A 14 N/A 0.215 in N/A 0.164 in N/A 7/16 in N/A 21/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.2500" Nominal Dia. N/A 1/4 in N/A 14 N/A 0.246 in N/A 0.192 in N/A 1/2 in N/A 19/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.1900" Nominal Dia. N/A No. 10 N/A 16 N/A 0.189 in N/A 0.141 in N/A 3/8 in N/A 7/16 in
N/A Thread Forming Tapping Screw Type AB, with 0.1640" Nominal Dia. N/A No. 8 N/A 18 N/A 0.166 in N/A 0.122 in N/A 5/16 in N/A 3/8 in
N/A Thread Forming Tapping Screw Type AB, with 0.1510" Nominal Dia. N/A No. 7 N/A 19 N/A 0.154 in N/A 0.115 in N/A 5/16 in N/A 3/8 in
N/A Thread Forming Tapping Screw Type AB, with 0.1250" Nominal Dia. N/A No. 5 N/A 20 N/A 0.130 in N/A 0.094 in N/A 1/4 in N/A 5/16 in
N/A Thread Forming Tapping Screw Type AB, with 0.1380" Nominal Dia. N/A No. 6 N/A 20 N/A 0.139 in N/A 0.104 in N/A 9/32 in N/A 11/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.1120" Nominal Dia. N/A No. 4 N/A 24 N/A 0.114 in N/A 0.086 in N/A 7/32 in N/A 9/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.0990" Nominal Dia. N/A No. 3 N/A 28 N/A 0.101 in N/A 0.075 in N/A 3/16 in N/A 1/4 in
N/A Thread Forming Tapping Screw Type AB, with 0.0860" Nominal Dia. N/A No. 2 N/A 32 N/A 0.088 in N/A 0.064 in N/A 3/16 in N/A 7/32 in
N/A Thread Forming Tapping Screw Type AB, with 0.0730" Nominal Dia. N/A No. 1 N/A 42 N/A 0.075 in N/A 0.049 in N/A 5/32 in N/A 3/16 in
N/A Thread Forming Tapping Screw Type AB, with 0.0600" Nominal Dia. N/A No. 0 N/A 48 N/A 0.060 in N/A 0.036 in N/A 1/8 in N/A 5/32 in
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