Item # TFTSAB02500XXX, Thread Forming Tapping Screw Type AB, with 0.2500" Nominal Dia. On Sales Systems Ltd.

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

Manufacturer | Specifications | Codes and Standards | Threads Per Inch

N/A Industrial Fasteners Institute

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

N/A ASME B18.6.4 1998

N/A 14

Manufacturer