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

M6
M6 - 8d
M8
M8 - 6d

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Effective tension is equal to centrifugal tension
Effective tension is half of centrifugal tension

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Machine Design
Pitch point of a cam is

Any point on the pitch curve
A point on the pitch curve having minimum pressure angle
Any point on the pitch circle
A point on the pitch curve having maximum pressure angle

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