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A head with no markings is grade 2, one with 3 lines spaced 120 degrees is grade 5, and 6 lines spaced at 60 degree intervals is grade 8. nuts are marked in several different ways—see identification marks for hex and heavy hex nuts below.

Alibaba offers 240 hex coupling long nut suppliers, and hex coupling long nut manufacturers, distributors, factories, companies. there are 144 oem, 117 odm, 19 self patent. find high quality hex coupling long nut suppliers on alibaba.

Astm a193 grade b7 specification covers requirements for high tensile alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. it is a standard specification defining typical chemical composition, mechanical properties, hardness requirement, preferential heat treatment, product marking, certification and other requirements, …

Astm a193 grade b7 bolts and threaded studs are manufactured from a chromium-molybdenum steel and are quenched and tempered (heat treated) to develop the desired mechanical properties (strength). grade b7 is the most common grade of a193 bolts used in construction. b7 threaded studs and short, headed bolts are readily available in the marketplace.

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