Unit of Measure
                    
               
        
            
                                                                                Nominal Diameter | 
                                                                        N/A 1/2" | 
                                                                                Effective Length | 
                                                                        N/A 1-27/64" | 
                                                                                Head Diameter | 
                                                                        N/A .630/.615 | 
                                                                                Head Thickness | 
                                                                        N/A .160/.146 |