Stainless Steel Bolts & Fasteners Sourcing from China
1 resources tagged with "Bolts"
Stainless hex bolts and nuts from China are commonly specified to ISO 3506 in A2-70 (304) and A4-80 (316) grades, with A4-316 chosen for marine and chemical exposure. The two recurring quality issues are grade substitution — A2 sold as A4 — and out-of-tolerance threads, which is why mill test reports (MTRs) and dimensional checks matter. Bulk and kit packaging are both standard, with fastener MOQs often quoted by weight or carton.
When sourcing fasteners, request the actual MTR tied to the heat lot and add a PMI (positive material identification) spot check, since 304 and 316 look identical but corrode very differently. We verify thread gauge pass/fail and torque-tension on a sample before bulk release.
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FAQ
How do I confirm I'm getting real A4-316 and not A2-304?
Require the mill test report and run a PMI (XRF or molybdenum spot test) on incoming lots. 316 contains molybdenum; 304 does not, and the cheap test detects it in seconds.
What MOQ is typical for stainless bolts from China?
Standard catalog sizes have low MOQs (often a few cartons), while custom lengths or special heads can require 5,000–10,000 pieces to justify a tooling or production run.
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