A lubricating compound, typically copper, nickel, aluminum or moly particles in a grease carrier, that leaves a solid film between threads even after the grease burns off at high temperature. It prevents galling on stainless, seizing in exhaust and furnace bolting, and corrosion bonding in wet service. It also drops the nut factor sharply, so a torque spec written for dry threads over-tightens an anti-seized bolt unless it is reduced.
Anti-seize on the exhaust studs, and knock the torque down, that stuff is slicker than oil.
Also heard as
- never-seize
- anti-seize compound
Related terms
Galling
Adhesive wear where thread surfaces cold-weld and tear under load, seizing a nut partway down a bolt.
Nut factor
The empirical constant K in T = KDF that lumps all the friction and geometry between torque and tension.
18-8 stainless
Fastener shorthand for austenitic 300-series stainless, about 18 percent chromium and 8 percent nickel.
Threadlocker
An anaerobic adhesive applied to threads that hardens between metal surfaces to stop loosening and seal.