What is galling?
Galling is a cold welding process that can occur between male and female threads when tightening stainless steel fasteners. A common problem is tightening a nylon insert lock nut on to a bolt or set screw. The heat and friction generated when tightening the nut can cause a physical and chemical reaction between the fasteners and can cause complete seizure of the parts. To reduce the possibility of galling, you should: [1] lubricate the threads with a molybdenum disulphide-based grease; [2] reduce the speed of tightening – tighten the nut slowly; or [3] use different stainless grades for the bolt and the nut. [Top] • We reserve the right to refuse service to anyone for any reason. Unfortunately we cannot tolerate abusive behaviour towards our staff and will refuse service. [Top] • What’s the difference between BSW and UNC threads? Apart from 1/2″ diameter BSW and UNC threads are compatible. BSW, also known as Whitworth, is a British thread standard devised in the 19th century. UNC or un
Galling is a cold welding process that can occur between male and female threads when tightening stainless steel fasteners. A common problem is tightening a nylon insert lock nut on to a bolt or set screw. The heat and friction generated when tightening the nut can cause a physical and chemical reaction between the fasteners and can cause complete seizure of the parts. To reduce the possibility of galling, you should: [1] lubricate the threads with a molybdenum disulphide-based grease; [2] reduce the speed of tightening – tighten the nut slowly; or [3] use different stainless grades for the bolt and the nut. [Top] • We reserve the right to refuse service to anyone for any reason. Unfortunately we cannot tolerate abusive behaviour towards our staff and will refuse service. [Top] • What’s the difference between BSW and UNC threads? BSW and UNC threads are compatible except for 1/2″ diameter. BSW, also known as Whitworth, is a British thread standard devised in the 19th century. UNC or un
