Bearing locknuts KM, DIN 981 / ISO 2982-2: KM0–KM10 (M10×0.75–M50×1.5) outside diameter, width, slots — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/bearing-locknuts-km-din-981/  (sheet CC BY 4.0)
Basis: Schaeffler and NTN catalogue pages for KM0, KM1, KM2 (main dimensions to DIN 981), Kramp and FAG listings for KM10, KM12, KM15, KM23, and SKF KM series values for the remaining sizes
Catalog version: 2026-10-20

Sizes: see table below
- Columns: designation, thread G, outside d2, chamfer diameter d1, width B, slot width b, slot depth h. Four slots, 30° chamfer on one face (Schaeffler). Use with MB lock washers (DIN 5406).
- Verified on the maker pages read: KM0 (d2 18, d1 13.5, B 4, b 3), KM1 (22, 17, 4, 3, h 2), KM2 (25, 21, 5, 4, h 2), KM10 (70 × 11). KM3–KM9 are SKF catalogue values; check a maker drawing before relying on d1 or h for those.
- Files: thread as a plain bore at the major diameter, as for the other nuts on Xem.

size  thread  d2  d1  B  b  h
KM0  M10x0.75  18  13.5  4  3  2
KM1  M12x1  22  17  4  3  2
KM2  M15x1  25  21  5  4  2
KM3  M17x1  28  24  5  4  2
KM4  M20x1  32  26  6  4  2
KM5  M25x1.5  38  32  7  5  2
KM6  M30x1.5  45  38  7  5  2
KM7  M35x1.5  52  44  8  5  2
KM8  M40x1.5  58  50  9  6  2.5
KM9  M45x1.5  65  56  10  6  2.5
KM10  M50x1.5  70  61  11  6  2.5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Schaeffler: KM0 locknut, main dimensions to DIN 981: G, d2, B, d1, b — web — Publisher's page; dimensions are facts — https://medias-at.schaeffler.com/en/produit/rotary/roulements-et-paliers-lisses/accessoires/ecrou-a-encoches/km0/p/418251
- Schaeffler: KM2 locknut, main dimensions to DIN 981 — web — Publisher's page; dimensions are facts — https://medias.schaeffler.com/medias/en!hp.ec.br.pr/KM*KM2
- Acorn Industrial: KM 9 locknut: M45×1.5, 65 mm OD, 10 mm wide — web — Publisher's page; dimensions are facts — https://acorn-ind.co.uk/p/km9-fag

Free files (CC BY 4.0, Xem Studio; STEP + STL, 11 parts): https://xemstudio.com/files/hardware/bearing-locknuts-km-din-981/index.json
API: https://xemstudio.com/api/geometry?object=bearing-locknuts-km-din-981