• 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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Unit of Measure
Items
Threads and Points for Type AB Thread Forming Tapping Screws

Thread Forming Tapping Screw Type AB, with 0.0600" Nominal Dia.
Threads and Points for Type AB Thread Forming Tapping Screws

Thread Forming Tapping Screw Type AB, with 0.0730" Nominal Dia.
Threads and Points for Type AB Thread Forming Tapping Screws

Thread Forming Tapping Screw Type AB, with 0.0860" Nominal Dia.
Threads and Points for Type AB Thread Forming Tapping Screws

Thread Forming Tapping Screw Type AB, with 0.0990" Nominal Dia.
Threads and Points for Type AB Thread Forming Tapping Screws

Thread Forming Tapping Screw Type AB, with 0.1120" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Tapping Screws
Codes and Standards N/A ASME B18.6.4 1998
Unit of Measure N/A English
Nominal Size or Basic Screw Dia. N/A No. 0 N/A No. 1 N/A No. 2 N/A No. 3 N/A No. 4
Nominal Size or Basic Screw Dia. (Decimal) N/A 0.0600 in N/A 0.0730 in N/A 0.0860 in N/A 0.0990 in N/A 0.1120 in
Threads Per Inch N/A 48 N/A 42 N/A 32 N/A 28 N/A 24
Max. Major Dia. (D) N/A 0.060 in N/A 0.075 in N/A 0.088 in N/A 0.101 in N/A 0.114 in
Min. Major Dia. (D) N/A 0.054 in N/A 0.069 in N/A 0.082 in N/A 0.095 in N/A 0.108 in
Max. Minor Dia. (d) N/A 0.036 in N/A 0.049 in N/A 0.064 in N/A 0.075 in N/A 0.086 in
Min. Minor Dia. (d) N/A 0.033 in N/A 0.046 in N/A 0.060 in N/A 0.071 in N/A 0.082 in
Min. Practical Nominal Screw Lengths for 90º Heads (L) N/A 1/8 in N/A 5/32 in N/A 3/16 in N/A 3/16 in N/A 7/32 in
Min. Practical Nominal Screw Lengths for Csk Heads (L) N/A 5/32 in N/A 3/16 in N/A 7/32 in N/A 1/4 in N/A 9/32 in
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