Thread Size
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .250-20 (1/4-20) 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Thread Code
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          0420 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Shank Code
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          1 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                A (Shank) Max.
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .054 in
                                                                                    
                                                                                                                                                      | 
                                                    
                                                    
                                                                        
                                                                                Min. Sheet Thickness
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .056 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Hole Size in Sheet + .003 - .000
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .344 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                B Max.
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .305 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                C Max.
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .343 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                E ± .010
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .430 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                F Min.
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .310 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                L Max.
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .500 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                T ± .010
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .560 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Min. Dist. Hole C/L to Edge
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          .34 in
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        | 
                                                                                For Use in Sheet Hardness1
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          HRB 80 / HB 150 or Less 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Thread Specification
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          Internal, ANSI B1.1, 2B 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Fastener Material
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          Heat-Treated Carbon Steel 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                Standard Finish
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless 
                                                                                    
                                                                                                                                                     | 
                                                    
                                                    
                                                                        
                                                                                CAD Supplier
                                                                                                                                                                                                                                 | 
                                                                        
                                                                                    
                                                                                        N/A
                                                                                          PennEngineering® (PEM®) 
                                                                                    
                                                                                                                                                     |