GB/T 5267.2-2021 Active

This document specifies the technical requirements for non-electrolytic zinc flake coatings on steel fasteners. This document applies to the following coatings: -- with or without hexavalent chromium; -- with or without surface coatings; -- with or without lubrication (self-lubricating and/or additional lubrication). This document applies to ISO metric threaded bolts, screws, studs and nuts, non-ISO metric threaded fasteners, and non-threaded fasteners such as washers, pins, clamps, etc. This document does not specify the weldability or coating performance of fasteners, and it does not apply to mechanical galvanizing. Note: High-strength fasteners (with a tensile strength of ≥1,000 MPa) use coatings that comply with this document to avoid the risk of internal hydrogen embrittlement (see 4.4). For design and installation information on coated fasteners, please refer to Appendix A.