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.
Total quality management at our end, has enabled us in providing our patrons with a fault free product, where the entire range of our astm a320 grade l7m alloy steel stud bolt is checked on stringent parameters to ensure quality. the high content of lead in astm a320 grade l7m as bolt results in a relatively low ductility and plasticity.
M5 x 0.80 6.1 4.6 8.8 6.7 10.3 7.7 m6 x 1.00 10.4 7.8 15 11.2 17.6 13.1 m7 x 1.00 17.6 13.1 25.1 18.9 29.4 22 m8 x 1.25 25.4 19.1 37.6 27.3 42.6 32.1 m10 x 1.50 50 38 72 54 84 64 m12 x 1.75 88 66 126 94 146 110 m14 x 2.00 141 106 201 150 235 176 m16 x 2.00 218 164 312 233 365 274
M8 x 100 grade 10.9 high tensile hexagon head bolt din 931, zinc plated more details
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