# One-way clutch bearings HF series (HF0812, HF1012, HF1216, HF2016): roller-set bore Fw, OD, width, torque

> What are the dimensions of an HF0812, HF1012, HF1216 or HF2016 one-way clutch needle bearing: bore Fw, outside diameter, width and torque?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: NTN one-way clutch table (Fw, D, C, Md) with HF1012 checked against Simply Bearings; numbers only
- Page: https://xemstudio.com/objects/one-way-clutch-bearings-hf-series/ · JSON: https://xemstudio.com/api/geometry?object=one-way-clutch-bearings-hf-series · Plain text: https://xemstudio.com/objects/one-way-clutch-bearings-hf-series/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- 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).

## Sizes

| 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) |

## Where the files are

- NTN (via BDS Bearing knowledge base): [One-way clutches, tension pulleys, bottom roller bearings: HF type Fw, D, C, torque Md, matching HK bearing](https://help.bdsbearing.com/hubfs/Knowledge%20Base/NTN/NTN%20One-way%20Clutches%2c%20Tension%20Pulleys%2c%20Bottom%20Roller%20Bearings.pdf) — web — Publisher's page; dimensions are facts
- 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](https://www.simplybearings.co.uk/products/hf-1012-eu) — web — Publisher's page; dimensions are facts
- 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)](https://www.simplybearings.co.uk/products/hf-0406-mb) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Needle bearings (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/needle-bearings) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What are the dimensions of an HF0812 one-way clutch bearing?**

Roller-set bore Fw 8, OD 12, width 12 mm; torque 3.15 N m (NTN).

**What are the dimensions of an HF1012?**

Fw 10, OD 14, width 12 mm; torque 5.3 N m; r min 0.3 (Simply Bearings).

**What do the numbers in HF1216 mean?**

Fw 12 mm and width 16 mm; the OD is 18 mm.

**Which HK bearing goes with an HF1012?**

HK1010 (NTN pairs each HF clutch with the HK of the same Fw).

**Do the makers agree on HF1012?**

Yes: 10 x 14 x 12 mm and 5.3 N m on NTN and Simply Bearings.

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