Question

What is the range of size that can be checked by double-ended Rib type snap gauges?

(a) 1 mm to 10 mm

(b) 10 mm to 20 mm

(c) 20 mm to 50 mm

(d) 3 mm to 100 mm

This question was posed to me in unit test.

My enquiry is from Plain Gauges in section Limits, Fits and Gauges of Engineering Metrology

Answer 1

The correct option is (d) 3 mm to 100 mm

For explanation I would say: It is convenient to use double ended type rib snap gauges to check sizes of 3 mm to 100 mm. For size, 100 to 250 mm single ended progressive type snap gauges are used. Gauging surface are hardened up to 720 HV. Other surfaces are of smooth finish.