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Q: The minimum spacing for M20 bolts, of grade 4.6, according to IS 800, is:
  • A. 50 mm
  • B. 37.4 mm
  • C. 33 mm
  • D. 55 mm
Correct Answer: Option A - Given that, Grade of bolt = M 20, These 20 represent nominal dia of bolt. d = 20 mm So, min spacing between bolt (min pitch). = 2.5 d = 2.5 ×20 = 50 mm
A. Given that, Grade of bolt = M 20, These 20 represent nominal dia of bolt. d = 20 mm So, min spacing between bolt (min pitch). = 2.5 d = 2.5 ×20 = 50 mm

Explanations:

Given that, Grade of bolt = M 20, These 20 represent nominal dia of bolt. d = 20 mm So, min spacing between bolt (min pitch). = 2.5 d = 2.5 ×20 = 50 mm