The 1-1/4″ Steel (Black Oxide) Machinable Shaft Adapter Max with Keyway is designed to modify, extend, or repair existing shafts by providing a fully machinable platform for custom shaft configurations. Precision-machined from black oxide steel, it allows step-up, step-down, or shaft extension modifications without requiring complete shaft replacement. The integrated keyway provides increased torsional holding power and fixed shaft phasing for reliable power transmission. Stocked In: Steel, Stainless Steel