Question About Rahul found a bolt of $20 \times 2$, where 2 represents:

Distance between two corresponding points on the adjacent threads.

Comprehension

Rahul was repairing his bicycle for unknown noises. He found some fasteners were loose. In his tool box, he found various fasteners. Help him in resolving his queries :

Question: 1

Rahul found a bolt of $20 \times 2$, where 2 represents:

Show Hint

In a bolt designated as $M20 \times 2$:
• Nominal Diameter ($d$) = $20$ mm
• Thread Pitch ($P$) = $2$ mm

Updated On: Jun 23, 2026

Thickness of bolt
Number of threads per mm
Double start thread
Distance between two corresponding points on the adjacent threads.

Show Solution

The Correct Option is D

Solution and Explanation

Was this answer helpful?

Question: 2

Which one is not a temporary fastener?

Show Hint

Remember: Threaded fasteners (bolts, screws, studs) are always temporary. Rivets and welds are permanent.

Updated On: Jun 23, 2026

Bolt
Rivet
Screw
Stud

Show Solution

The Correct Option is B

Solution and Explanation

Was this answer helpful?

Question: 3

M in M8, M10, M12 on bolts stands for

Show Hint

Other thread designations include UNC (Unified National Coarse), UNF (Unified National Fine), and BSW (British Standard Whitworth, which has a $55^{\circ}$ angle).

Updated On: Jun 23, 2026