Galling

Galling (cold-welding) is a phenomenon that occurs when two, generally similar, materials are pressed against each other under high pressure.
The materials are, more or less, welded together. In many cases this phenomenon occurs with bolt-nut or shaft-hub connections. In most cases this connection can no longer be disassembled. This phenomenon mostly occurs with stainless (especially austenitic) steels.

To prevent galling:

• Make sure not both parts are made of the same stainless steel type
• Use lubricant
• Consider Kolsterising (www.bodycoat.com)