Ratchets and pawls allow motion in one direction while preventing motion in the opposite direction and are used in a wide range of applications such as material handling equipment, conveyor systems and machinery controls. WM Berg ratchet gears are available in 17-4 PH or 303 stainless steel in a range of pitches, with a ⅜ or 11/16 bore. Special ratchets and pawls can be made - contact us to order. Mounting shoulder screws sold separately.