Applicable to screw types as indicated by code symbols.
- 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 | 
                                                                                Nominal Size or Basic Screw Dia. | 
                                                                        N/A 1/2 in | 
                                                                                Nominal Size or Basic Screw Dia. (Decimal) | 
                                                                        N/A 0.5000 in | 
| Applicable to Screw Types1 | 
                                                                                    
                                                                                        N/A
                                                                                          3  4  | 
                                                    
                                                                                Max. Width Across Flats (A) | 
                                                                        N/A 0.750 in | 
                                                                                Min. Width Across Flats (A) | 
                                                                        N/A 0.735 in | 
                                                                                Min. Width Across Corners (W) | 
                                                                        N/A 0.820 in | 
                                                                                Max. Head Height (H) | 
                                                                        N/A 0.400 in | 
                                                                                Min. Head Height (H) | 
                                                                        N/A 0.367 in | 
                                                                                Max. Washer Dia. (B) | 
                                                                        N/A 1.040 in | 
                                                                                Min. Washer Dia. (B) | 
                                                                        N/A 0.960 in | 
                                                                                Max. Washer Thickness (U) | 
                                                                        N/A 0.085 in | 
                                                                                Min. Washer Thickness (U) | 
                                                                        N/A 0.050 in | 
                                                                                Min. Protrusion Beyond Gaging Ring (F) | 
                                                                        N/A 0.220 in | 
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
 
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