To measure the effective diameter of an external metric thread (included angle is 60 ) of 3.5 mm pitch, a cylindrical standard of 30.5 mm diameter and two wires of 2 mm diameter each are used. The micrometer reading over the standard and over the wires are 16.532 mm and 15.398 mm respectively. The effective diameter (in mm) of the thread is

To measure the effective diameter of an external metric thread (includ

1.	To measure the effective diameter of an external metric thread (included angle is 60 ) of 3.5 mm pitch, a cylindrical standard of 30.5 mm diameter and two wires of 2 mm diameter each are used. The micrometer reading over the standard and over the wires are 16.532 mm and 15.398 mm respectively. The effective diameter (in mm) of the thread is
A.	33.336
B.	30.397
C.	29.366
D.	26.397
Answer» C. 29.366

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