Question

What is the wear allowance recommended by BSI for solid ring and plug gauges?

(a) 0.01mm

(b) 0.5mm

(c) 0.05mm

(d) 0.001mm

The question was asked at a job interview.

I'd like to ask this question from Gauge Wear in division Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

Answer 1

The correct choice is (c) 0.05mm

Easiest explanation: The allowance recommended by B.S.I, for wear on generally used solid ring and plug gauges is 0.002 inch (0.05 mm). Frequent checking of solid pattern gauges is necessary in order to obviate this effect.