HK needle roller bearings (drawn cup): HK0306 to HK2020 bore, outside diameter and width + STEP/STL envelopes — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/needle-roller-bearings-hk-series/ (sheet CC BY 4.0) Basis: Emerson Bearing HK series list, with Motion Industries (HK1212), Reliance (HK1616) and Kramp (HK2010) cross-checks; McMaster-Carr linked for CAD Catalog version: 2026-10-20 Sizes: see table below - HK bearings are drawn-cup needle roller bearings, open at both ends: a thin hardened steel cup with a full set of needles inside. There is no inner ring: the needles run on the shaft, so the shaft is the raceway and must be hard and ground (the hardness is not in these tables). The cup is pressed into a bore of tight tolerance. Designation: HK + Fw (2 digits) + B (2 digits): HK0810 = 8 mm bore, 10 mm wide; HK1616 = 16 mm bore, 16 mm wide. Fw is the shaft size the bearing is made for. - Numbers: Emerson Bearing's HK list for Fw × D × B (24 rows read, 64 total on the page); HK1212 is confirmed by Motion Industries and HK1616 by Reliance; HK2010 is Kramp's (20 × 26 × 10) and HK2020 is Emerson's HK2020 page. The designations are asserted against their digits. Emerson's HK0306 / HK0408 rows carry a 'TN' suffix on the source site; the base designation is used. A source row labelled HK1215 (12 × 16 × 10) is a mislabel: 12 × 16 × 10 is HK1210, so the row was dropped. - Files: 8 envelopes (HK0608, 0808, 1010, 1212, 1512, 1616, 2010, 2020) as one plain tube bore Fw, OD D, width B. The cup wall, needles, lip radius and lubricating holes are not in the tables, so they are not drawn. Fw is a nominal inscribed diameter, not a machined hole: the shaft is the real inner surface. - Left out: the HK..RS (sealed) and HK..B (closed end) variants, the BK closed-end series, shaft and housing tolerance tables (not read), load ratings, inch sizes. bearing bore (roller inscribed circle) Fw, mm outside Ø D, mm width B, mm HK0306 3 7 6 HK0408 4 8 8 HK0509 5 9 9 HK0608 6 10 8 HK0609 6 10 9 HK0709 7 11 9 HK0808 8 12 8 HK0810 8 12 10 HK0908 9 13 8 HK0910 9 13 10 HK0912 9 13 12 HK1010 10 14 10 HK1012 10 14 12 HK1015 10 14 15 HK1212 12 18 12 HK1312 13 19 12 HK1412 14 20 12 HK1512 15 21 12 HK1516 15 21 16 HK1522 15 21 22 HK1612 16 22 12 HK1616 16 22 16 HK1622 16 22 22 HK1712 17 23 12 HK2010 20 26 10 HK2020 20 26 20 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Emerson Bearing: HK style standard needle roller bearings (drawn cup, open ends): Fw, D, B, HK0306 to HK1712 — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/viewitems/standard-needle-roller-bearings/hk-style-standard-needle-roller-bearings?plpver=30 - Emerson Bearing: HK2020: Fw 20, D 26, B 20 — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/printitem/standard-needle-roller-bearings/hk-style-standard-needle-roller-bearings/hk2020?plpver=10 - Motion Industries: HK1212 (INA-series HK, open ends): 12 x 18 x 12 — web — Publisher's page; dimensions are facts — https://www.motion.com/products/sku/00127513 - Reliance: INA HK1616 open-end drawn cup needle bearing: 16 x 22 x 16 — web — Publisher's page; dimensions are facts — https://reliance.ie/en-ie/bearings/ina-drawn-cup-needle-roller-bearing-open-end-hk1616 - Kramp: HK2010B: Fw 20, D 26, C 10, open ends — web — Publisher's page; dimensions are facts — https://kramp.com/shop-bg/en/p/cup-needle-roller-bearing--HK2010B - 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 Free files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/index.json API: https://xemstudio.com/api/geometry?object=needle-roller-bearings-hk-series