Parallel Keys | McMaster-Carr

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Stainless Steel

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Chromate Conversion Coated

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1,625 Products

Machine Keys

Rounded Machine Keys

Rounded Machine Keys

Fill oval keyways completely, reducing stress on the key and shaft

Machine Keys

Install in keyways to transmit torque from shafts to gears and other components

Tapped Rounded Machine Keys

Tapped Rounded Machine Keys

Thread a screw through the tapped hole to pop these keys out of a keyway

Undersized Machine Key Assortments

Undersized Machine Key Assortments

A looser fit than standard keys, so they're best for uneven keyways or frequent disassembly

Machine Key and Woodruff Key Assortments

Machine Key and Woodruff Key Assortments

Include an assortment of machine and woodruff keys in various sizes

Undersized Key Stock Assortments

Undersized Key Stock Assortments

A looser fit than standard keys and are best for inconsistent keyways

Oversized Machine Key Assortments

Oversized Machine Key Assortments

Slightly larger than the size listed for a tight fit in worn keyways

Standard Key Stock Assortments

Standard Key Stock Assortments

Include various sizes of key stock that you can cut to your desired length

Oversized Key Stock Assortments

Oversized Key Stock Assortments

Slightly larger than standard key stock, so keys fit tightly in worn keyways

Other Products

Machine Key Stock

Machine Key Stock

Cut a custom length to transfer torque from shafts to components such as gears and sprockets

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)