Grooved and lock nut SKF KM 34, Female thread: M 170x3 | Nominal diameter (metric): 170 mm

KM and KML lock nuts are used to locate bearings onto a shaft. They have metric threads and four equally spaced slots located around their circumference to accommodate a spanner. They should be locked by a lock washer to prevent unintentional loosening. KM and KML lock nuts can be reused, provided they are not damaged.