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- 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.
Unit of Measure
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 0.2160 in |
Min. Major Dia. (D) |
N/A 0.2085 in |
Ref. Point Dia. (P) |
N/A 0.180 in |
Max. Point Taper Length For Short Screws (S) |
N/A 0.125 in |
Min. Point Taper Length For Short Screws (S) |
N/A 0.089 in |
Max. Point Taper Length For Long Screws (S) |
N/A 0.161 in |
Min. Point Taper Length For Long Screws (S) |
N/A 0.125 in |
Determinant Lengths for Point Taper 90º Heads (L) |
N/A 5/16 in |
Determinant Lengths for Point Taper Csk Heads (L) |
N/A 13/32 in |
Min. Practical Nominal Screw Lengths for 90º Heads (L) |
N/A 9/32 in |
Min. Practical Nominal Screw Lengths for Csk Heads (L) |
N/A 3/8 in |
