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This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
Applicable to screw types as indicated by code symbols.
Applicable to screw types as indicated by code symbols.
- 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.
Unit of Measure
Specifications
Product |
N/A Tapping Screws |
Unit of Measure |
N/A English |
Type |
N/A Type IA Long Screws with Shoulder |
Nominal Size or Basic Screw Dia. |
N/A No. 8 |
Nominal Size or Basic Screw Dia. (Decimal) |
N/A 0.1640 in |
Head Size |
N/A 6 |
| Applicable to Screw Types1 |
N/A
1 2 3 4 |
Ref. Recess Dia. (M) |
N/A 0.188 in |
Ref. Recess Depth ((T) |
N/A 0.117 in |
Ref. Recess Width (N) |
N/A 0.041 in |
Driver Size |
N/A 2 |
Max. Recess Penetration Gaging Depth |
N/A 0.109 in |
Min. Recess Penetration Gaging Depth |
N/A 0.091 in |
Max. Protrusion Above Gaging Dia. (F) |
N/A 0.080 in |
Min. Protrusion Above Gaging Dia. (F) |
N/A 0.057 in |
Gaging Dia. (G) |
N/A 0.220 in |
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
