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About Key Stock

Shop premium key stock in various dimensions, materials, finishes, and more from Zoro. Key stock is steel (usually carbon steel or stainless steel) in bar form that is used to make shaft keys. The key stock is typically cut to size in the field to create machine keys used in repairs and rebuilds. Machine keys serve as a locking mechanism and provide the torque needed for a transmission turning a shaft. Shaft keys can also serve as safety stops. We carry undersized key stock, oversized key stock, step key stock, and more from leading brands at everyday low prices.