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See Chinese contents: GB/T 5357-2023 GB/T 5357-2023: Keys for hexalobular socket screws
This document specifies the product classification and marking, technical requirements, test methods, inspection rules, markings, packaging, transportation, and storage of keys for hexalobular socket screws, and describes the corresponding test methods. This document applies to hexalobular keys (hereinafter referred to as and quot;keys and quot;) for tightening hexalobular socket screws and bolts.
