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.
Astm a193 grade b7. astm a193 grade b7 is a standard specification for high tensile chromium molybdenum alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. it covers material specification for bolting used in pressure vessel service, valves, flanges and fittings. astm a193 defines both si (metric) and inch-pound …
A193 b7 alloy steel round bar the asme a193 designation covers fasteners intended for use in pressure vessels, valves, flanges, and fittings. heat treated chromium-molybendum (aisi 4140) high-yield bolting steel for high pressure applications.
Din 603 carriage bolt / round head square neck bolts made from steel class4.8 , class 8.8 or stainless a2-70, a4-80 etc.
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