Link BeltBS224941Cylindrical Roller Bearing 90 x 160 x 34 mm, Non-Standard Width with No Direct ISO Interchange, Rockwell Top-Loader Differential Pinion Bearing, NSN 3110-00-158-6011

Product Description

What this part is

This is a bare cylindrical roller bearing carrying Link-Belt part number BS224941. Published dimensions confirm a 90.0 mm (3.5433 in) bore and a 34.0 mm (1.338 in) width. The 160 mm outside diameter is consistent with the way this part has always been listed and with the standard 90 mm bore envelope, but it was not independently confirmed on the source page, so treat it as listed rather than verified — measure the outer ring if the housing bore is critical to you.

Decoding the designation

BS is a Link-Belt internal series prefix, and 224941 is a sequential Link-Belt part number. It is not a dimension code. Buyers will reasonably try to read it as a bearing series and it does not work: 224941 does not indicate a 22xxx spherical roller series, and it does not indicate a 218 or 2218 cylindrical series either. The only way to identify this bearing is by its dimensions and its documented application, which is why both are spelled out here.

What these specs mean in practice

The FSC of the assigned national stock number, 3110, is Unmounted Antifriction Bearings. That confirms in the official record that this is a bare bearing — rings and rollers only, no housing, no pillow block, no take-up unit. It is worth stating plainly because Link-Belt is best known for mounted bearing units, and a buyer seeing the Link-Belt name may assume a housing is included. It is not.

Load ratings are not published for this part number in any source available for this listing, so no dynamic or static capacity figures have been entered. Any rating you see quoted elsewhere for a “90 x 160” cylindrical roller bearing will belong to a standard NU218 or NU2218, which this bearing is not, and applying those numbers here would be wrong in both directions.

Configuration, and what is not published

Row count, cage type, and whether the bearing is an NU, NJ or NUP configuration are not published. Given documented pinion-bearing service, a single-row design with an integral thrust rib would be a reasonable guess, but that is inference and not published data, so no row-count or cage-type specification has been entered and none should be assumed. If NU versus NJ versus NUP matters to your rebuild — and for axial location it usually does — ask and the outer ring markings can be photographed before purchase.

Interchange guidance

This is the most important thing on the page. 90 x 160 x 34 mm is a non-standard width with no direct ISO interchange. The ISO standard bearings at 90 x 160 are NU218 / NJ218 at 90 x 160 x 30 mm and NU2218 / NJ2218 at 90 x 160 x 40 mm. At 34 mm, this bearing falls between the two, which means it is a purpose-made special rather than a rebranded catalogue item.

Any cross-reference that offers NU218 or NU2218 as a substitute for BS224941 is wrong. An NU218 will be 4 mm too narrow and an NU2218 will be 6 mm too wide, and in a pinion location that width error changes bearing seating and preload, not just fit. Buy on the Link-Belt number or on the documented application number, not on the 90 x 160 dimension pair.

Documented application and cross-reference

This part number is catalogued as the outer front and rear differential pinion bearing for Rockwell “top loader” axles used on 5-ton military trucks: the M939, M939A1 and M939A2 series, and M923, M925, M927, M929, M930 and M931 variants, plus M54, M52, M51, M809, M813, M814, M816, M817, M818 and M820. The national stock number is 3110-00-158-6011, with alternate and superseding part number 11665824 (a US Government drawing number).

That is a documented application and a strong search term, not a restriction — the bearing is an industrial cylindrical roller bearing and can be used anywhere the dimensions and configuration suit. But because the part is a non-standard special, the military application is in practice the most reliable way for a buyer to confirm they are looking at the right bearing.

Manufacturer and availability trail

Link-Belt bearings passed to Rexnord and then to Regal Rexnord through successive acquisitions. Current-production catalogue support for a specific legacy Link-Belt bearing number is limited, which is what makes new old stock like this worth holding onto. This example is new, made in the USA, in an opened box.