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Whittet Higgins CNS40-16S Collar Impact Resistant Connection part 1/2" square headThe Whittet Higgins CNS40 16S is a one piece clampnut with a 16 threads per inch fine pitch thread that threads directly onto a shaft or housing to position, retain, and preload bearings and other components. A tangential (X axis) socket head clamp screw draws the nut tight against the mating shaft threads to create a mechanical self locking joint. This self locking action resists loosening from vibration, shock, and torque without damaging the shaft