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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 Short Screws |
Nominal Size or Basic Screw Dia. |
N/A No. 4 |
Nominal Size or Basic Screw Dia. (Decimal) |
N/A 0.1120 in |
Head Size |
N/A 3 |
| Applicable to Screw Types1 |
N/A
1 2 3 4 |
Ref. Recess Dia. (M) |
N/A 0.118 in |
Ref. Recess Depth ((T) |
N/A 0.077 in |
Ref. Recess Width (N) |
N/A 0.030 in |
Driver Size |
N/A 1 |
Max. Recess Penetration Gaging Depth |
N/A 0.074 in |
Min. Recess Penetration Gaging Depth |
N/A 0.058 in |
Max. Protrusion Above Gaging Dia. (F) |
N/A 0.064 in |
Min. Protrusion Above Gaging Dia. (F) |
N/A 0.044 in |
Gaging Dia. (G) |
N/A 0.148 in |
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
