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 | 
                                                                                Nominal Size or Basic Screw Dia. | 
                                                                        N/A No. 8 | 
                                                                                Nominal Size or Basic Screw Dia. (Decimal) | 
                                                                        N/A 0.1640 in | 
| Applicable to Screw Types1 | 
                                                                                    
                                                                                        N/A
                                                                                          1  2 3 4  | 
                                                    
                                                                                Max. Head Dia. (A) | 
                                                                        N/A 0.322 in | 
                                                                                Min. Head Dia. (A) | 
                                                                        N/A 0.306 in | 
                                                                                Max. Head Height (H) | 
                                                                        N/A 0.096 in | 
                                                                                Min. Head Height (H) | 
                                                                        N/A 0.085 in | 
                                                                                Max. Head Radius (R) | 
                                                                        N/A 0.052 in | 
                                                                                Max. Slot Width (J) | 
                                                                        N/A 0.054 in | 
                                                                                Min. Slot Width (J) | 
                                                                        N/A 0.045 in | 
                                                                                Max. Slot Depth (T) | 
                                                                        N/A 0.058 in | 
                                                                                Min. Slot Depth (T) | 
                                                                        N/A 0.045 in | 
- 1 1 = Circle, 2 = Diamond, 3 = Triangle, 4 = Square
 
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