Machine Design
The taper on cotter varies from

1 in 15 to 1 in 10
1 in 24 to 1 in 20
1 in 48 to 1 in 24
1 in 32 to 1 in 24

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Machine Design
Cap screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between parts
Provided with detachable caps
Slotted for a screw driver and generally used with a nut

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