M3 top quality square neck steel carriage bolts

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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.

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 …

M5-0.8 (2) m6-1.0 (25) m7-1.0 (1) m8-1.25 (24) see more see less ... bolt grade grade 10.9 (79) grade 2 (7) grade 8 (56) grade 8.8 (1) grade 9 (5) grade 9.8 (1) standard (2) type carriage (5) flange bolt (1) flanged (44) material ...

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