Cylindrical roller bearings NU2xx and NU3xx (NU205, NU206, NU208, NU305, NU310 and more): bore, OD, width, r, Fw + 18 ring-envelope STEP/STL files — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/cylindrical-roller-bearings-nu2xx-nu3xx/ (sheet CC BY 4.0) Basis: Koyo (JTEKT) cylindrical roller bearing catalogue rows (d, D, B, r, r1, Fw) checked against Emerson Bearing's NU200 list and the 72xx / 73xx lists; maker product page linked Catalog version: 2026-10-20 Sizes: see table below - NU is the single-row cylindrical roller bearing with two ribs on the outer ring and a plain inner ring: it takes heavy radial load and lets the shaft float axially, so it sits in gearboxes, electric motors and machine-tool spindles. NU2xx is the 02 dimension series (same bore, OD and width as a 72xx angular-contact bearing) and NU3xx the 03 series (same as 73xx). - Numbers: Koyo (JTEKT) cylindrical roller bearing catalogue pages (NU204 to NU216, NU304 to NU315: d, D, B, r, r1 and Fw), with Emerson Bearing's NU2xx E list as the independent check on d, D and B for every NU2xx row. NU3xx is checked against Emerson's 73xx angular-contact list, which has the same 03-series bore, OD and width on every row, and NU2xx against the 72xx list likewise. Emerson's NU202 to NU230 rows give d, D, B only; the Koyo rows used are the plain NU (the 'R' versions, e.g. NU205R, have a smaller Fw and are not used). - Fw is the diameter of the inscribed circle of the rollers on the inner ring (the inner ring raceway diameter); the matching Ew on the outer ring is not in the tables read. r min is the smallest allowed chamfer, r1 min the rib-face chamfer; the envelope files round all four corners at r min. - Files: 18 ring envelopes (NU204 to NU212 and NU304 to NU312): one solid ring, bore d, OD D, width B, corners rounded at r min. No rollers, cage, ribs or raceway steps. - Left out: the 22 and 23 series (NU2204, NU2304 and the NU32xx / NU33xx rows in the Koyo pages), the NJ, NUP, N, NF types, 'R' and 'E' variants, NU217 and larger with r (Koyo pages read stop at NU216 for series 2 and NU315 for series 3), loads and speeds, inch sizes. bearing bore d, mm OD D, mm width B, mm r min, mm r1 min, mm inner raceway Ø Fw, mm source NU202 15 35 11 — — — Emerson (d, D, B only) NU203 17 40 12 — — — Emerson (d, D, B only) NU204 20 47 14 1 0.6 27 Koyo + Emerson NU205 25 52 15 1 0.6 32 Koyo + Emerson NU206 30 62 16 1 0.6 38.5 Koyo + Emerson NU207 35 72 17 1.1 0.6 43.8 Koyo + Emerson NU208 40 80 18 1.1 1.1 50 Koyo + Emerson NU209 45 85 19 1.1 1.1 55 Koyo + Emerson NU210 50 90 20 1.1 1.1 60.4 Koyo + Emerson NU211 55 100 21 1.5 1.1 66.5 Koyo + Emerson NU212 60 110 22 1.5 1.5 73.5 Koyo + Emerson NU213 65 120 23 1.5 1.5 79.6 Koyo + Emerson NU214 70 125 24 1.5 1.5 84.5 Koyo + Emerson NU215 75 130 25 1.5 1.5 88.5 Koyo + Emerson NU216 80 140 26 2 2 95.3 Koyo + Emerson NU217 85 150 28 — — — Emerson (d, D, B only) NU218 90 160 30 — — — Emerson (d, D, B only) NU219 95 170 32 — — — Emerson (d, D, B only) NU220 100 180 34 — — — Emerson (d, D, B only) NU221 105 190 36 — — — Emerson (d, D, B only) NU222 110 200 38 — — — Emerson (d, D, B only) NU224 120 215 40 — — — Emerson (d, D, B only) NU226 130 230 40 — — — Emerson (d, D, B only) NU228 140 250 42 — — — Emerson (d, D, B only) NU230 150 270 45 — — — Emerson (d, D, B only) NU304 20 52 15 1.1 0.6 28.5 Koyo NU305 25 62 17 1.1 1.1 35 Koyo NU306 30 72 19 1.1 1.1 42 Koyo NU307 35 80 21 1.5 1.1 46.2 Koyo NU308 40 90 23 1.5 1.5 53.5 Koyo NU309 45 100 25 1.5 1.5 58.5 Koyo NU310 50 110 27 2 2 65 Koyo NU311 55 120 29 2 2 70.5 Koyo NU312 60 130 31 2.1 2.1 77 Koyo NU313 65 140 33 2.1 2.1 83.5 Koyo NU314 70 150 35 2.1 2.1 90 Koyo NU315 75 160 37 2.1 2.1 95.5 Koyo Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - JTEKT (Koyo), via AIMS Industrial: Single-row cylindrical roller bearings, catalogue pages 318 to 337 selected: NU204 to NU216 and NU304 to NU315 with d, D, B, r, r1, Fw — web — Publisher's page; dimensions are facts — https://aimsindustrial.com.au/cdn/shop/files/Koyo-Cylindrical-Roller-Bearings-Catalogue-Cover-and-Pages-318-to-337-Selected-18-Pages.pdf - Emerson Bearing: 200 series cylindrical roller bearings NU202 E to NU230 E: bore, OD, width — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/printitems/cylindrical-roller-bearings/200-series-cylindrical-roller-bearings?plpver=10 - Emerson Bearing: 200 series cylindrical roller bearings (view page): NU204 E, NU210 E, NU216 E, NU230 E checked — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/viewitems/cylindrical-roller-bearings/200-series-cylindrical-roller-bearings?plpver=10 - Emerson Bearing: 7200 series light-duty standard angular contact ball bearings: bore, OD, width, 7200 B to 7226 B — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/printitems/standard-angular-contact-ball-bearings/light-duty-standard-angular-contact-ball-bearings?plpver=10 - Emerson Bearing: 7300 series medium-duty standard angular contact ball bearings: bore, OD, width, 7301 B to 7328 B — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/printitems/standard-angular-contact-ball-bearings/medium-duty-standard-angular-contact-ball-bearings?plpver=10 - JTEKT (Koyo) product database: Per-part page for a Koyo cylindrical roller bearing (NU2205 shown); dimensions, check each part page for CAD downloads — web — Publisher's page; dimensions are facts — https://koyo.jtekt.co.jp/en/products/detail/?pno=NU2205 - NTN: Rolling bearing catalogue, chapter 7 Bearing fits: Table 7.2 (1) shaft tolerance classes and Table 7.2 (3) housing bore tolerance classes for radial bearings (classes 0, 6X, 6) — web — Publisher's page; dimensions are facts — https://www.ntnglobal.com/en/products/catalog/pdf/2203E_a07.pdf Free files (CC BY 4.0, Xem Studio; STEP + STL, 18 parts): https://xemstudio.com/files/hardware/cylindrical-roller-bearings-nu2xx-nu3xx/index.json API: https://xemstudio.com/api/geometry?object=cylindrical-roller-bearings-nu2xx-nu3xx