Ruland MCLC-40-40-F One-Piece Clamping Rigid Coupling with Keyway, Black Oxide Steel, Metric, 40mm Bore A Diameter, 40mm Bore B Diameter, 77mm OD, 108mm Length, 12mm x 12mm Keyway Width

.Precision honed bores for superior fit and torque transmission. Does not mar the shaft. Keyways are used for additional torque transmission capabilities and to prevent slippage on the shaft.
.Proprietary Nypatch anti-vibration hardware prevents galling, maintains high holding power, and allows for multiple screw insertions. Nypatch significantly reduces installation time as no additional screw treatment is needed prior to use.
.Made from 1215 lead-free steel with proprietary black oxide finish for increased holding power and corrosion resistance.
.Machined to a fine burr-free finish.
.Hardware exceeds DIN 912 12.9 standards for maximum torque capabilities. Ruland rigid couplings are carefully made from select North American bar stock in our Marlborough, Massachusetts factory and are RoHS3 and REACH compliant.