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Q: Which of the following bolts are used for light structures under static loads?
  • A. Finished bolts
  • B. Turned bolts
  • C. Unfinished bolts
  • D. HSFG bolts
Correct Answer: Option C - Unfinished bolts– Unfinished bolts are also called ordinary, common, rough or black bolts. These are for light structures, subjected to static loads and for secondary member such as purlins, bracing, root trusses etc. • Turned and fitted bolts– Turned and fitted bolts have uniform shanks and are inserted in close tolerance drilled holes and made tight by box spanners. • High strength friction grip bolts (HGSF)– These bolts should be tightened to their proof loads and require hardened washers to distribute the load under the bolt heads.
C. Unfinished bolts– Unfinished bolts are also called ordinary, common, rough or black bolts. These are for light structures, subjected to static loads and for secondary member such as purlins, bracing, root trusses etc. • Turned and fitted bolts– Turned and fitted bolts have uniform shanks and are inserted in close tolerance drilled holes and made tight by box spanners. • High strength friction grip bolts (HGSF)– These bolts should be tightened to their proof loads and require hardened washers to distribute the load under the bolt heads.

Explanations:

Unfinished bolts– Unfinished bolts are also called ordinary, common, rough or black bolts. These are for light structures, subjected to static loads and for secondary member such as purlins, bracing, root trusses etc. • Turned and fitted bolts– Turned and fitted bolts have uniform shanks and are inserted in close tolerance drilled holes and made tight by box spanners. • High strength friction grip bolts (HGSF)– These bolts should be tightened to their proof loads and require hardened washers to distribute the load under the bolt heads.