The 12mm 12mm Black (Oxide Steel) Metric One-Piece Clamp – Precision Sleeve Couplings with Keyway is constructed from high-quality steel with a protective black oxide finish, engineered for superior durability, wear resistance, and reliable performance. Designed with a solid center section, it provides a close-tolerance fit on ground shafting and includes a built-in keyway for positive torque transmission. Its patented AccuClamp design features integral self-centering clamping collars at both ends to ensure accurate coaxial alignment, maintaining concentricity of <0.001" TIR during operation. Precision-machined for exacting standards, this coupling delivers high clamping power, non-marring shaft contact, and straightforward adjustabilitymaking it an ideal choice for applications requiring precise alignment and dependable connection.