The newly revised ISO standards related to fastener surface protection have been officially released and gradually implemented in international procurement projects, bringing important changes for fastener suppliers who serve worldwide industrial markets. The updated clauses place clearer and stricter requirements for coating thickness uniformity, anti‑corrosion testing assessment criteria, hydrogen‑embrittlement risk control and documentation traceability of metal fastener products.
Surface treatment including electro‑galvanizing, black oxidation, hot‑dip galvanizing and mechanical zinc plating largely determines the service lifespan of screws, bolts and nuts working in outdoor, marine or high‑humidity operating environments. In past cross‑border procurement practices, many quality disputes arose from inconsistent coating quality, insufficient salt‑spray resistance and hydrogen‑induced cracking risks on high‑strength parts. The new ISO specifications set unified testing and judging rules to reduce such international trade disputes between buyers and manufacturers.
Under the new‑standard framework, fastener factories need to upgrade their surface‑treatment production workflows. Extra attention must be paid to degreasing before coating, hydrogen‑removal baking procedures for high‑strength alloy‑steel fasteners, real‑time monitoring of coating thickness and finished‑batch sampling anti‑corrosion verification. In addition, manufacturers are required to reserve complete process records that can be provided for third‑party audit upon client request.
Ningbo Liangmao Standard Parts Co.,Ltd has studied the full content of the updated ISO clauses. Our production and QC departments have adjusted operating parameters for the surface‑treatment workshop. We are fully prepared to produce fastener goods that meet the latest international standard requirements for our global clients.
