{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "needle-roller-bearings-hk-series", "name": "HK needle roller bearings (drawn cup): HK0306 to HK2020 bore, outside diameter and width + STEP/STL envelopes", "kind": "standard", "category": "Hardware", "group": "Bearings, rails & motion", "year": null, "question": "What are the dimensions of HK0808, HK1010, HK1212, HK1616 and HK2020 drawn-cup needle roller bearings: bore, outside diameter and width?", "tags": [ "needle bearing", "hk", "hk0808", "hk1010", "hk1212", "hk1616", "drawn cup", "roller bearing" ], "aliases": [ "hk0808 dimensions", "hk1010 dimensions", "hk1212 dimensions", "hk1512 dimensions", "hk1616 dimensions", "hk2010 dimensions", "hk2020 dimensions", "hk0810", "hk0608", "hk0509", "hk0306", "needle bearing 8x12x8", "needle bearing 10x14x10", "needle bearing 16x22x16", "drawn cup needle bearing stl", "hk needle bearing 12mm" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 8, "url": "https://xemstudio.com/objects/needle-roller-bearings-hk-series/", "sheet_txt": "https://xemstudio.com/objects/needle-roller-bearings-hk-series/sheet.txt", "sheet": { "basis": "Emerson Bearing HK series list, with Motion Industries (HK1212), Reliance (HK1616) and Kramp (HK2010) cross-checks; McMaster-Carr linked for CAD", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "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." ], "table": { "columns": [ "bearing", "bore (roller inscribed circle) Fw, mm", "outside Ø D, mm", "width B, mm" ], "rows": [ [ "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" ] ] } }, "sheet_text": "HK needle roller bearings (drawn cup): HK0306 to HK2020 bore, outside diameter and width + STEP/STL envelopes — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/needle-roller-bearings-hk-series/ (sheet CC BY 4.0)\nBasis: Emerson Bearing HK series list, with Motion Industries (HK1212), Reliance (HK1616) and Kramp (HK2010) cross-checks; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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.\n- 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.\n- 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.\n\nbearing bore (roller inscribed circle) Fw, mm outside Ø D, mm width B, mm\nHK0306 3 7 6\nHK0408 4 8 8\nHK0509 5 9 9\nHK0608 6 10 8\nHK0609 6 10 9\nHK0709 7 11 9\nHK0808 8 12 8\nHK0810 8 12 10\nHK0908 9 13 8\nHK0910 9 13 10\nHK0912 9 13 12\nHK1010 10 14 10\nHK1012 10 14 12\nHK1015 10 14 15\nHK1212 12 18 12\nHK1312 13 19 12\nHK1412 14 20 12\nHK1512 15 21 12\nHK1516 15 21 16\nHK1522 15 21 22\nHK1612 16 22 12\nHK1616 16 22 16\nHK1622 16 22 22\nHK1712 17 23 12\nHK2010 20 26 10\nHK2020 20 26 20\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- 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\n- 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\n- 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\n- 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\n- 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\n- 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\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/index.json\nAPI: https://xemstudio.com/api/geometry?object=needle-roller-bearings-hk-series\n", "sources": [ { "publisher": "Emerson Bearing", "title": "HK style standard needle roller bearings (drawn cup, open ends): Fw, D, B, HK0306 to HK1712", "url": "https://products.emersonbearing.com/viewitems/standard-needle-roller-bearings/hk-style-standard-needle-roller-bearings?plpver=30", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Emerson Bearing", "title": "HK2020: Fw 20, D 26, B 20", "url": "https://products.emersonbearing.com/printitem/standard-needle-roller-bearings/hk-style-standard-needle-roller-bearings/hk2020?plpver=10", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Motion Industries", "title": "HK1212 (INA-series HK, open ends): 12 x 18 x 12", "url": "https://www.motion.com/products/sku/00127513", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Reliance", "title": "INA HK1616 open-end drawn cup needle bearing: 16 x 22 x 16", "url": "https://reliance.ie/en-ie/bearings/ina-drawn-cup-needle-roller-bearing-open-end-hk1616", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Kramp", "title": "HK2010B: Fw 20, D 26, C 10, open ends", "url": "https://kramp.com/shop-bg/en/p/cup-needle-roller-bearing--HK2010B", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "McMaster-Carr", "title": "Needle bearings (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/needle-bearings", "formats": [ "STEP", "IGES", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false } ], "xem": { "status": "free-files", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "ball-bearings-metric", "thrust-ball-bearings-51100-series", "deep-groove-ball-bearings-series", "linear-shafts-h6", "sintered-bushings-iso-2795", "pillow-block-kp08" ], "fits": [], "dimensions": "exact (nominal, no tolerance added)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/", "mating": [ { "feature": "bore Fw", "exact": "Ø8 to Ø20 (HK0808 to HK2020 files)", "mates": "hardened ground shaft of the same nominal diameter: the shaft is the raceway", "fit": "run", "files": "HK" }, { "feature": "outside Ø D", "exact": "Ø12 to Ø26", "mates": "housing bore of the same nominal diameter (the cup is pressed in)", "fit": "press", "files": "HK" } ], "fit_classes": { "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.", "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.", "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).", "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.", "clamp": "split part that closes on the mating part with screws: make it at size.", "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change." }, "faq": [ { "q": "What size is an HK0808 needle bearing?", "a": "8 mm bore, 12 mm OD, 8 mm wide." }, { "q": "What size is an HK1616?", "a": "16 mm bore, 22 mm OD, 16 mm wide." }, { "q": "What do the numbers in HK1010 mean?", "a": "10 mm bore (Fw) and 10 mm width B; the OD is 14 mm." }, { "q": "Does an HK needle bearing have an inner ring?", "a": "No: the needles run directly on a hardened, ground shaft." } ], "files_license": null, "offers": [ { "file": "HK0608-drawn-cup-needle-bearing-envelope-6x10x8", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK0608-drawn-cup-needle-bearing-envelope-6x10x8.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK0608-drawn-cup-needle-bearing-envelope-6x10x8.stl", "note": "HK0608 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 6, outside Ø10, width 8; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK0808-drawn-cup-needle-bearing-envelope-8x12x8", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK0808-drawn-cup-needle-bearing-envelope-8x12x8.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK0808-drawn-cup-needle-bearing-envelope-8x12x8.stl", "note": "HK0808 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 8, outside Ø12, width 8; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK1010-drawn-cup-needle-bearing-envelope-10x14x10", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1010-drawn-cup-needle-bearing-envelope-10x14x10.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1010-drawn-cup-needle-bearing-envelope-10x14x10.stl", "note": "HK1010 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 10, outside Ø14, width 10; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK1212-drawn-cup-needle-bearing-envelope-12x18x12", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1212-drawn-cup-needle-bearing-envelope-12x18x12.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1212-drawn-cup-needle-bearing-envelope-12x18x12.stl", "note": "HK1212 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 12, outside Ø18, width 12; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK1512-drawn-cup-needle-bearing-envelope-15x21x12", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1512-drawn-cup-needle-bearing-envelope-15x21x12.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1512-drawn-cup-needle-bearing-envelope-15x21x12.stl", "note": "HK1512 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 15, outside Ø21, width 12; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK1616-drawn-cup-needle-bearing-envelope-16x22x16", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1616-drawn-cup-needle-bearing-envelope-16x22x16.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK1616-drawn-cup-needle-bearing-envelope-16x22x16.stl", "note": "HK1616 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 16, outside Ø22, width 16; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK2010-drawn-cup-needle-bearing-envelope-20x26x10", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK2010-drawn-cup-needle-bearing-envelope-20x26x10.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK2010-drawn-cup-needle-bearing-envelope-20x26x10.stl", "note": "HK2010 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 20, outside Ø26, width 10; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" }, { "file": "HK2020-drawn-cup-needle-bearing-envelope-20x26x20", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK2020-drawn-cup-needle-bearing-envelope-20x26x20.step", "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-hk-series/HK2020-drawn-cup-needle-bearing-envelope-20x26x20.stl", "note": "HK2020 drawn-cup needle roller bearing envelope: needle-circle (inscribed) bore Fw 20, outside Ø26, width 20; one plain tube (cup wall, rollers and the rounded lips are not separated); nominal values" } ], "markdown": "https://xemstudio.com/objects/needle-roller-bearings-hk-series/index.md" }