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.
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Dimension table for t-slots, bolts, and nuts table chart. engineering hardware standards. dimension table for t-slots, bolts, and nuts per. american national standard t-slots ansi/asme b5.1m-1985. 1. width of tongue used with the t-slots will be found in the complete standard, b5.1m. 2. throat dimensions are basic.
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