The diameter of the best wire to measure the effective

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The diameter of the best wire to measure the effective diameter of metric screw threads of 0.5 mm pitch is.... mm

1. 0.28mm
2. 0.38mm
3. 0.25mm
4. 0.29mm

Correct Option: A

P = 0.5

d_w =	0.5	× Sec30°
	2

d_w = 0.28mm