Description :7/8\"(22.2 mm) dia Zinc plated/Galvanised Lock bolts with collar (Part No. 2820 ) with grip range 31-\r38. One set consisting of 1 no. lock bolt & 1 no. collar.The Head of the lock bolts necessarily be marked with\rmanufacture%u2019s identification. The marking on collar should be done on lower bottom surface as per\rDrg.No. RDSO Drg.WD-11036-S-01 and WD-11036-S-02 Alt. Nil. specn: Base metal- Steel. ASTM B633 and\rASTM B695 and ASTM B117 minimum 48 Hrs; Lock bolt should have a hardness in a range of 28-34 HRC and\rCollar have a hardness in a range of 60-80 HRC.
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