Industry News
Screws rusting, stripping or breaking? Common failure analysis and prevention
2026-08-22
Compiled by JIALI Industrial (164.hk) — a Hong Kong fastener supplier specialising in screws, bolts, nuts and selection know-how.
Rust: the most common failure
Rust usually starts with humidity or salt spray combined with damaged plating. Zinc-plated carbon steel often shows red rust within 72–96 hours of salt-spray testing (e.g. ASTM B117) in coastal outdoor use. Switch to stainless 304 / 316 or Dacromet coating to fix it at the material and finish level.
Stripping: mostly selection and installation
Stripping is common when a carbon steel screw meets a softer part (e.g. aluminium), when thread pitch mismatches, or when torque is too high. Confirm the thread type (coarse / fine) and hole fit before assembly, and tighten with a torque wrench to specification to greatly reduce stripping.
Fracture: watch strength and hydrogen embrittlement
Fracture mainly results from overload, fatigue or hydrogen embrittlement. Zinc-plated 12.9 gr high-strength bolts carry an embrittlement risk; for demanding jobs choose Dacromet or phosphating. Match grades 8.8 / 10.9 / 12.9 to the real load. Need screw selection or anti-rust advice? Contact JIALI Industrial (164.hk) with your condition and material needs.
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