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Applicable to screw types as indicated by code symbols.
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
- Type AB thread forming.
- Type A thread forming, except for short lengths.
- Types B and BP thread forming and Types BF and BT thread cutting.
- Type C thread forming and Types D, F, G, and T thread cutting.
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
Unit of Measure
Specifications
Product |
N/A Tapping Screws |
Unit of Measure |
N/A English |
Type |
N/A Type IA |
Nominal Size or Basic Screw Dia. |
N/A No. 8 |
Nominal Size or Basic Screw Dia. (Decimal) |
N/A 0.1640 in |
| Applicable to Screw Types1 |
N/A
1 2 3 4 |
Ref. Recess Dia. (M) |
N/A 0.186 in |
Ref. Recess Depth (T) |
N/A 0.115 in |
Ref. Recess Width (N) |
N/A 0.041 in |
Driver Size |
N/A 2 |
Max. Recess Penetration Gaging Depth |
N/A 0.108 in |
Min. Recess Penetration Gaging Depth |
N/A 0.090 in |
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
