Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M8
M8 - 6d
M6 - 8d
M6

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Machine Design
Turn buckle has

No threads
Left hand threads on one end and right hand threads on other end
Left hand threads on both ends
Right hand threads on bout ends

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