56. The number of slots in a 25 mm castle nut is
57. According to I.B.R., the thickness of the boiler shell should not be less than
58. According to I.B.R., the factor of safety of riveted joint should not be less than
59. According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than
60. The draw of cotter should not be more than
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