One-way clutch bearings HF series (HF0812, HF1012, HF1216, HF2016): roller-set bore Fw, OD, width, torque — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/one-way-clutch-bearings-hf-series/  (sheet CC BY 4.0)
Basis: NTN one-way clutch table (Fw, D, C, Md) with HF1012 checked against Simply Bearings; numbers only
Catalog version: 2026-10-20

Sizes: see table below
- HF is a one-way needle roller clutch in a drawn-cup shell: it locks the shaft in one direction and freewheels in the other (indexers, ratchets, backstops, hand-crank winches, fan and printer drives). It is a press fit in a housing bore of D; Fw is the circle inscribed to the rollers, so the shaft must be hardened and ground to that size (the HF number is Fw then width: HF1012 = 10 x 12). The matching radial bearing in the table is the HK drawn-cup needle bearing of the same Fw (page: needle-roller-bearings-hk-series).
- Numbers: NTN's one-way clutch table (Fw, D, C, torque Md, mass, matching HK bearing) for HF0612 to HF3520. HF1012 (10 x 14 x 12, 5.3 N m, r min 0.3, width tolerance 0/-0.3) is also on Simply Bearings, and HF0406 (4 x 8 x 6, 0.34 N m) only there, labelled as a non-standard bore. NTN's table has no HF0406, HF0306, HF0608 or HF2020. The NSK HF0812 page could not be read, so there is no maker CAD link here.
- Numbers only, no files: the cup lip, roller and spring geometry and the chamfers are not published in the tables read (only HF1012 and HF0406 have an r min, both from one distributor).
- Left out: the maximum speed (only one distributor's value was read), HFL / HFZ variants, the radial-load part numbers printed in the NTN table, and the HK bearing dimensions (see the HK page).

clutch  roller-set bore Fw, mm  OD D, mm  width C, mm  torque Md, N m  matching radial bearing (HK)  mass, kg  source
HF0612  6  10  12  1.76  HK0609T2  0.003  NTN
HF0812  8  12  12  3.15  HK0810  0.0035  NTN
HF1012  10  14  12  5.30  HK1010  0.004  NTN + Simply Bearings (r min 0.3)
HF1216  12  18  16  12.2  HK1212  0.0116  NTN
HF1416  14  20  16  17.3  HK1412  0.013  NTN
HF1616  16  22  16  20.5  HK1612  0.014  NTN
HF1816  18  24  16  24.1  HK1812  0.0155  NTN
HF2016  20  26  16  28.5  HK2012  0.017  NTN
HF2520  25  32  20  66  HK2512  0.0309  NTN
HF3020  30  37  20  90  HK3012  0.036  NTN
HF3520  35  42  20  121  HK3512  0.040  NTN
HF0406  4  8  6  0.34  —  0.001  Simply Bearings only (r min 0.3; listed as non-standard bore)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- NTN (via BDS Bearing knowledge base): One-way clutches, tension pulleys, bottom roller bearings: HF type Fw, D, C, torque Md, matching HK bearing — web — Publisher's page; dimensions are facts — https://help.bdsbearing.com/hubfs/Knowledge%20Base/NTN/NTN%20One-way%20Clutches%2c%20Tension%20Pulleys%2c%20Bottom%20Roller%20Bearings.pdf
- Simply Bearings: HF1012 one-way needle roller clutch: Fw 10, D 14, C 12 (0/-0.3), r min 0.3, 5.3 N m — web — Publisher's page; dimensions are facts — https://www.simplybearings.co.uk/products/hf-1012-eu
- Simply Bearings: HF0406 one-way needle roller clutch: Fw 4, D 8, C 6, r min 0.3, 0.34 N m (listed as a non-standard bore) — web — Publisher's page; dimensions are facts — https://www.simplybearings.co.uk/products/hf-0406-mb
- McMaster-Carr: Needle bearings (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/needle-bearings

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=one-way-clutch-bearings-hf-series