These nuts have a nylon insert which grips the bolt thread to prevent loosening.
BZP Nyloc Nuts
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            Technical Data:
               
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                                        1533 Midfix DIN 985 BZP Nyloc Nuts PDS
                                    
                                
                                
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                        [77.6Kb]
                                    
                                
                            Features & Applications
- Locknut with nylon insert
- Bright zinc plated
- DIN985
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