How to prevent stainless steel fastener galling
Galling is a form of cold welding or friction-based seizure that can occur when stainless steel fasteners are tightened, especially at high speeds or under high pressure.
The metal surfaces stick and tear, which can cause:
- Seized nuts and bolts
- Stripped threads
- Fractured fasteners
Why stainless is more prone to galling
Stainless steel is tough, corrosion-resistant, and naturally forms a protective oxide layer. However, under pressure and without lubrication, similar metal surfaces can bond and shear.
This is especially likely when:
- Threads are poorly aligned
- Torque is too high
- Threads are dry or dirty
- Installation is too fast (heat + pressure)
6 ways to prevent galling
1. Use proper thread lubrication
Apply an anti-seize compound or lubricant designed for stainless threads. This reduces friction and heat.
2. Don’t over-torque
Follow recommended torque specs - especially for stainless, which has lower yield than carbon steel.
3. Slow down installation
Avoid high-speed tools. Hand-tighten or use slower torque tools to reduce heat buildup.
4. Clean threads before use
Debris and dirt increase friction. Use a wire brush or compressed air to ensure clean engagement.
5. Choose rolled threads over cut threads
Rolled threads have smoother surfaces and are less prone to galling.
Additional tips for installers
- Avoid reusing galled fasteners
- Use washers to reduce thread engagement
- Specify coated or treated stainless if repeated assembly is expected
- Download our galling PDF
Work with fastener experts
At United Fasteners, we stock high-quality stainless hardware and anti-galling products that meet Australian conditions and standards.
Avoid costly failures. Browse our stainless range or ask our team for help preventing galling in your application.