Thread galling is a common yet a seldom understood fastener problem seen by engineers and fabricators. It occurs when pressure and friction cause bolt threads to seize to the threads of a nut or tapped hole. The fasteners are not just overly tight but “cold/contact

Rev. 3-4-09 Galling Thread Galling Thread galling is a common, yet seldom understood problem with threaded fasteners. Galling, often referred to as a cold-welding process, can occur when the surfaces of male and female threads are placed under heavy pressure.

Definition – Galling is the seizing or abrading of threads caused by adhesion between sliding surfaces of the fasteners’ mating threads. Overview – Fortunately thread galling is not a widespread problem with threaded fasteners, butwhen it does occur there can be ...

2017/11/16 · This definition explains the meaning of Galling and why it matters. What Does Galling Mean? Galling is a type of wear that occurs when materials that are compressed against one another are put into motion that causes friction.

2019/4/4 · Galling results in a catastrophic failure and accompanied by materials transfer and appears as a groove, or score mark, terminating in a mound of metal. Some applications where galling is encountered are roller chain belt pins, woven screening, hanger, end, and spherical bearings, and valve and pump components.

• Introduction ·
• Mechanism ·
• Incidence and location ·
• Prevention ·
• See also

Negative sides of fine threaded fasteners: Fine threads are more susceptible to galling than coarse threads. They need longer thread engagements and are more prone to damage and thread fouling. They are also less suitable for high-speed assembly since they are more likely to seize when being tightened.