Cylindrical pins of 25+0.010+0.020mm diameter are electroplated

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Cylindrical pins of 25^{+0.010^+0.020}mm diameter are electroplated in a shop. Thickness of the plating is 30^±2.0 micron. Neglecting gauge tolerance, the sized of the GO gage in mm to inspect the plated component is

1. 25.042
2. 25.052
3. 25.074
4. 25.084

Correct Option: D

Size of Go Gauge = (25 + 0.20) + [(30+2) × 10^{– 3}] × 2 = 25.084 mm.