Applicable to screw types as indicated by code symbols.
This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
- Type A thread forming, except for short lengths.
 
This type of recess has a large center opening, tapered 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 I | 
                                                                                Nominal Size or Basic Screw Dia. | 
                                                                        N/A No. 24 | 
                                                                                Nominal Size or Basic Screw Dia. (Decimal) | 
                                                                        N/A 0.3720 in | 
| Applicable to Screw Types1 | 
                                                                                    
                                                                                        N/A
                                                                                          2  | 
                                                    
                                                                                Ref. Recess Dia. (M) | 
                                                                        N/A 0.430 in | 
                                                                                Ref. Recess Depth (T) | 
                                                                        N/A 0.270 in | 
                                                                                Ref. Recess Width (N) | 
                                                                        N/A 0.072 in | 
                                                                                Driver Size | 
                                                                        N/A 4 | 
                                                                                Max. Recess Penetration Gaging Depth | 
                                                                        N/A 0.262 in | 
                                                                                Min. Recess Penetration Gaging Depth | 
                                                                        N/A 0.238 in | 
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
 
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