Q: What does the mark on the nut and bolt mean? Answer: Bolts and nuts are often marked with numbers, letters, horizontal lines, diagonal lines, and points. There are two common fastener markings: a unique manufacturer identification symbol (such as a letter or a token) and information indicating the strength of the fastener. Such markings vary depending on how the fasteners are made. Alloy steel metric fasteners and stainless steel metric fasteners conforming to ISO standards are shown in the table to the right. UNC threaded fasteners primarily follow ASTM standards. Due to the lack of space, according to ISO 898â€1, small-sized fasteners can be unmarked, such as those with a diameter below M5. Bolts larger than this size must be marked on the head.
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According to the surface cover chain link fence is divided into Galvanized Chain Link Fence and Vinyl Coated Chain Link Fence. As the low cost and easy installation Vinyl Coated Chain Link Fence is used in many areas which covers road, railway, high-way and other fence facilities.
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