Applicable to screw types as indicated by code symbols.
- Type A thread forming, except for short lengths.
 
                    Unit of Measure
                    
               
        
            Specifications
                                                                                Product | 
                                                                        N/A Tapping Screws | 
                                                                                Unit of Measure | 
                                                                        N/A English | 
                                                                                Nominal Size or Basic Screw Dia. | 
                                                                        N/A No. 14 | 
                                                                                Nominal Size or Basic Screw Dia. (Decimal) | 
                                                                        N/A 0.2420 in | 
| Applicable to Screw Types1 | 
                                                                                    
                                                                                        N/A
                                                                                          2  | 
                                                    
                                                                                Max. Width Across Flats (A) | 
                                                                        N/A 0.375 in | 
                                                                                Min. Width Across Flats (A) | 
                                                                        N/A 0.367 in | 
                                                                                Min. Width Across Corners (W) | 
                                                                        N/A 0.409 in | 
                                                                                Max. Head Height (H) | 
                                                                        N/A 0.190 in | 
                                                                                Min. Head Height (H) | 
                                                                        N/A 0.172 in | 
                                                                                Max. Washer Dia. (B) | 
                                                                        N/A 0.520 in | 
                                                                                Min. Washer Dia. (B) | 
                                                                        N/A 0.480 in | 
                                                                                Max. Washer Thickness (U) | 
                                                                        N/A 0.050 in | 
                                                                                Min. Washer Thickness (U) | 
                                                                        N/A 0.030 in | 
                                                                                Min. Protrusion Beyond Gaging Ring (F) | 
                                                                        N/A 0.103 in | 
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
 
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