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- 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.
Unit of Measure
Specifications
Product |
N/A Tapping Screws |
Unit of Measure |
N/A English |
Nominal Size or Basic Screw Dia. |
N/A 1/4 in |
Nominal Size or Basic Screw Dia. (Decimal) |
N/A 0.2500 in |
Max. Major Dia. (D) |
N/A 0.246 in |
Min. Major Dia. (D) |
N/A 0.237 in |
Max. Minor Dia. (d) |
N/A 0.192 in |
Min. Minor Dia. (d) |
N/A 0.185 in |
Min. Practical Nominal Screw Lengths for 90º Heads (L) |
N/A 1/2 in |
Min. Practical Nominal Screw Lengths for Csk Heads (L) |
N/A 19/32 in |
