Key stock is a precision-manufactured square or rectangular steel bar (available in carbon or stainless grades) designed for use as the raw material from which machine keys are cut. It offers uniform dimensions and tolerance so that when a keyway is milled or broached, the resulting key fits snugly and resists twisting inside a shaft and hub. Smaller lengths can be chosen to lower shipping costs by shipping via UPS, while larger quantities and weights may require freight services. With a variety of sizes and in stock, key stock gives you a reliable, ready-to-use base for creating your own keys and mechanical components. We carry Key Stock in Carbon Steel and Stainless Steel.