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NBK Japan MJC-40CS-ERD 12mm to 18mm Jaw-type Flexible Coupling Nachi ABEC-5 Precision Bearing NBK Japan MJC-80-EBL 7/8 inchNBK Japan MJC 40CS ERD 12mm to 18mm Jaw type Flexible Coupling NBK Japan MJC 40CS ERD 12mm to 18mm Jaw type Flexible Coupling NBK Japan MJC 40CS ERD 12mm to 18mm 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: 18mm Coupling Length: 66 Coupling Outer Diameter: 40 Material: Stainless This is a jaw type flexible