What should be the included angle of the cutting tool used for machining metric threads in a thread-cutting operation?

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RRB JE ME 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. 45 degrees
  2. 60 degrees
  3. 75 degrees
  4. 55 degrees

Answer (Detailed Solution Below)

Option 2 : 60 degrees
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Explanation:

Metric Thread:

The Bureau of Indian Standards has adopted a unified screw thread profile based on the metric system as the standard thread profile for use in India and designated it as the Metric Screw Thread.

  • It also recommends the pitch of the thread instead of threads per inch as one of the standard parameters in specifying a screw thread.
  • Metric threads are specified in a drawing by the letter M followed by the nominal size (Basic Major Diameter) and pitch. both expressed in millimetres.
  • The included angle of the cutting tool used for machining metric threads in a thread-cutting operation is 60°.

For example a 20 mm diameter 1.25 mm pitch fine screw thread is expressed as M20 × 1.25.

A 20 mm diameter 1.5 pitch a count screw thread is expressed as M20. 

  • It is customary not to mention the pitch of a coarse thread.
  • If thread length is required to be specified it is added after the pitch and an x is used to separate the length of the thread from the rest of the designation. 

For example M10 × 1.25 × 25 indicates a thread length of 25 mm.

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