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.
Title: identification marks for hex and heavy hex nuts author: fastener mart created date: 8/12/2006 10:47:21 pm
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 …
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