Commercial-grade hex head bolts
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Dear teachers: What does \"commercial grade\" mean in the context of commercial-grade hex head bolts mentioned in HG20613? This specification defines the scope of application for commodity-grade hex head bolts. 5.0.1 The operating conditions for commercial-grade hex head bolts and I-type hex nuts shall meet the following requirements: 1 The nominal pressure class shall be less than or equal to PN16. 2 Non-toxic, non-flammable media and applications without severe cycling. 3 Use non-metallic flat gaskets. In table 5.0.7-23 of the bolt specifications in this standard, the dimensions for hex head bolts with PN160 rating, that is, 160 kilograms of pressure, are specified. These bolts are presumably not of commercial grade; so how is the difference between commercial-grade and non-commercial-grade bolts determined?
Numbers 8.8, 6.8, 4.8: A2-70, A2-50 – these are for commercial use; the others are for specialized purposes