Numerical - Diameter of wire for a Withworth thread of M 24 x 7 mm - Metrology & Quality Control

Q.  Calculate diameter of best wire for a Withworth thread of M 24 x 7 mm size.
- Published on 07 Aug 15

a. 4.04 mm
b. 7.8 mm
c. 3.94 mm
d. 8.08 mm

ANSWER: 3.94 mm

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    Discussion

  • Raghavendra    -Posted on 15 Aug 18
    Sir tap drill size formula
    M16*2=?
  • Raghavendra    -Posted on 15 Aug 18
    Sir tap drill size formula
    M16*2=?
  • Sravanthi   -Posted on 26 Oct 15
    Given: Withworth thread M 24 x 7 mm

    Formula:

    Diameter is calculated using the formula below:

    For metric thread, diameter of best wire = (pitch / 2) x sec (60/2) = 0.577 p

    For Whitworth thread, diameter of best wire = (pitch / 2) x sec (55/2) = 0.5636 p

    Solution:

    Best wire is defined as the wire which touches thread exactly on pitch point.

    For given Whitworth thread, pitch = 7

    Diameter of best wire = 0.5636 p

    = 0.5636 x 7

    = 3.94 mm

    Diameter of best wire for a Whitworth thread of M 24 x 7 mm size is 3.94 mm.

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