# 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

#### 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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