• Points of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type T screws shall have an included angle of 90º to 95º and the thread cutting edge located above the axis of screw. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through the first full thread beyond taper except for Type F screws on which tapered threads may be complete at manufacturer's option and flutes may be one pitch short of the first full form thread. Other details of taper and flute design shall be optional with the manufacturer, provided the screws meet the specified performance requirements.
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Screws of these nominal lengths and shorter shall have point taper lengths specified for short screws. Longer lengths shall have point taper lengths specified for long screws.
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Unit of Measure
Items
Type T

Thread Cutting Tapping Screw Type T, with 0.0860" Nominal Dia.
Type T

Thread Cutting Tapping Screw Type T, with 0.0860" Nominal Dia.
Type T

Thread Cutting Tapping Screw Type T, with 0.0990" Nominal Dia.
Type T

Thread Cutting Tapping Screw Type T, with 0.0990" Nominal Dia.
Type T

Thread Cutting Tapping Screw Type T, 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. 2 N/A No. 2 N/A No. 3 N/A No. 3 N/A No. 4
Nominal Size or Basic Screw Dia. (Decimal) N/A 0.0860 in N/A 0.0860 in N/A 0.0990 in N/A 0.0990 in N/A 0.1120 in
Threads Per Inch N/A 56 N/A 64 N/A 48 N/A 56 N/A 40
Max. Major Dia. (D) N/A 0.0860 in N/A 0.0860 in N/A 0.099 in N/A 0.099 in N/A 0.1120 in
Min. Major Dia. (D) N/A 0.0813 in N/A 0.0816 in N/A 0.0938 in N/A 0.0942 in N/A 0.1061 in
Ref. Point Dia. (P) N/A 0.068 in N/A 0.070 in N/A 0.078 in N/A 0.081 in N/A 0.087 in
Max. Point Taper Length For Short Screws (S) N/A 0.062 in N/A 0.055 in N/A 0.073 in N/A 0.062 in N/A 0.088 in
Min. Point Taper Length For Short Screws (S) N/A 0.045 in N/A 0.039 in N/A 0.052 in N/A 0.045 in N/A 0.062 in
Max. Point Taper Length For Long Screws (S) N/A 0.080 in N/A 0.070 in N/A 0.094 in N/A 0.080 in N/A 0.112 in
Min. Point Taper Length For Long Screws (S) N/A 0.062 in N/A 0.055 in N/A 0.073 in N/A 0.062 in N/A 0.088 in
Determinant Lengths for Point Taper 90º Heads (L) N/A 5/32 in N/A 1/8 in N/A 3/16 in N/A 5/32 in N/A 7/32 in
Determinant Lengths for Point Taper Csk Heads (L) N/A 3/16 in N/A 3/16 in N/A 7/32 in N/A 3/16 in N/A 1/4 in
Min. Practical Nominal Screw Lengths for 90º Heads (L) N/A 5/32 in N/A 1/8 in N/A 5/32 in N/A 5/32 in N/A 3/16 in
Min. Practical Nominal Screw Lengths for Csk Heads (L) N/A 3/16 in N/A 5/32 in N/A 7/32 in N/A 3/16 in N/A 1/4 in
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