NJ 2308 Bearing – Size, Stock & Today’s Price

The NJ 2308 is a cylindrical roller bearing with a 40 mm bore, a 90 mm outside diameter and a width of 33 mm. Cylindrical roller bearings carry heavy radial loads, because the rollers touch the raceways along a line rather than at a point, and they suit high speeds. Depending on the design, they let the shaft move slightly along its length or locate it in one or both directions.

The last two digits of the number, 08, give the bore: 08 × 5 = 40 mm. Match the full designation, including any letters after the number, when you replace a bearing.

For the same 40 mm bore we also supply the NU 1008 (40 × 68 × 15 mm), the NN 3008 (40 × 68 × 21 mm), the NJ 208, N 208 and NU 208 (40 × 80 × 18 mm) and the NU 2208, NJ 2208 and NUP 2208 (40 × 80 × 23 mm). They fit the same shaft but have a different outside diameter or width, so they need a different housing: check both before you order. The same 40 × 90 × 33 mm size is also listed as the NUP 2308, NU 2308 (a different rib or cage design): tell us the letters on the old bearing.

Why NJ 2308 prices vary

• Genuine or copy: fakes sell far below the real price and fail early. We sell only genuine bearings.
• Brand and origin: each maker, and each country of manufacture, is priced differently.
• Version: clearance (C3, C4), tapered bore (K), cage and special-design versions are priced differently from the standard one.
• Quantity: bulk and repeat orders are priced lower.

So we quote today’s price for each brand rather than list one number. Ask for the NJ 2308 price on WhatsApp.

NJ 2308 dimensions

Dimensions are the ISO 15 standard size, the same in every brand. Weight varies slightly by brand and design.

NJ 2308 load and speed ratings

Figures for the SKF NJ 2308 ECJ from SKF’s online catalogue (checked 9 Oct 2026). Other versions and brands publish slightly different ratings for the same size. SKF data sheet.

NJ 2308 variants

Every NJ 2308 has the same outside dimensions. These are the versions you will meet most often:

• NJ 2308: Two ribs on the outer ring and one on the inner ring: it locates the shaft in one direction.
• Letters after the number: On SKF bearings EC marks the optimised internal design and the cage letter follows: J pressed steel, P polyamide, M machined brass. FAG writes E-XL and uses cage codes such as M1 or TVP2.
• Other designs: NU and N float, NJ and NF locate one way, NUP locates both ways. Tell us the design letters on the old bearing.

NJ 2308 equivalents by brand

Same size, written in each maker’s own style. Tap a brand to see how it numbers its bearings.

Where the NJ 2308 is used

• Electric motors
• Gearboxes
• Pumps and compressors
• Machine tools
• Rolling mills
• Industrial fans and blowers

Brands available for NJ 2308

Is your NJ 2308 genuine?

Counterfeit bearings are sold in many sizes and brands, including the NJ 2308. Check that the marking on the ring matches the box exactly, that the brand’s own suffix style is used, and be wary of prices far below the market. How to spot a fake bearing.

Updated 18 October 2026