61. I.S. specifies following total number of grades of tolerances
62. When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)
63. The function of cutting oil when threading a pipe is to
64. The dedendum is the radial distance from the
65. If threads on a bolt are left hand, threads on nut will be
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