The SKF Hook spanner, size 21 - 22, is designed for easy tightening and loosening of lock nuts. They are used to secure and adjust bearings on tapered journals, adapter sleeves and withdrawal sleeves. They fit on a variety of lock nuts with outer diameter(s) 135 - 145 mm. To be more specific for locknuts: KM 21, KM 22, KMFE 21, KMFE 22, KMT 20, KMT 22, AN 21, AN 22 and M95x2, M100x2 (DIN 1804).
