Pins and keys are used to mount machine elements

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Pins and keys are used to mount machine elements securely to a shaft Gears, pulleys, cams, etc. Connects hub of component to shaft Transmits full torque (no slip)
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Keys and Pins Used to secure rotating elements and to transmit torque a) Square key b) Round key c) Round pin d) Round pin e) Taper pin f) Roll pin Fig. 7–16
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Key selection based on shaft diameter
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