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NBK Japan MJC-40K-RD 12mm to 19mm Jaw-type Flexible Coupling 🔔 inner diameter 7.5 Bottom brackets rely on sealedNBK Japan MJC 40K RD 12mm to 19mm Jaw type Flexible Coupling NBK Japan MJC 40K RD 12mm to 19mm Jaw type Flexible Coupling NBK Japan MJC 40K RD 12mm to 19mm Jaw type Flexible Coupling, this is a Jaw type flexible coupling. The bellows allows eccentricity, angularmisalignment, and end play. Coupling Bore 1 Diameter: 12mm Coupling Bore 2 Diameter: 19mm Coupling Length: 66 Coupling Outer Diameter: 40 Material: Stainless This is a jaw type flexible