FAGNNU4932MDouble Row Cylindrical Roller Bearing – Straight Bore, 160 mm ID, 220 mm OD, 60 mm Width, 2 Rows, Machined Brass Cage, Non-Locating

Product Description

What this part is

FAG NNU4932M double-row cylindrical roller bearing. Series: NNU49. Bore: 160 mm. Outside Diameter: 220 mm. Width: 60 mm. Two rows of cylindrical rollers, straight bore, separable. Country of origin: Germany.

Decoding the designation

NNU marks a double-row cylindrical roller bearing with the ribs on both rings, so the roller set is guided in the outer ring. 49 is the dimension series. M is a machined brass cage. The designation carries no K, so the bore is cylindrical and straight.

What these specs mean in practice

Dynamic Load Rating: 335 kN (75,309 lbf). Static Load Rating: 680 kN (152,872 lbf). Fatigue Load Limit: 83 kN. Limiting speed: 3,400 rpm on grease, 4,000 rpm on oil. Line contact between cylindrical rollers and flat raceways gives a far higher static rating than dynamic, which is normal for this bearing type. Two rows in a section only 60 mm wide put a very high radial capacity into a short axial space, which is why this construction is used on machine tool spindles and rolling mill rolls. This is a non-locating bearing: the roller set can float axially within the ring ribs, taking up 2.7 mm of axial displacement, so the shaft is located by another bearing in the arrangement and thermal growth is absorbed here. The machined brass cage carries higher speed and temperature than a pressed steel cage, and the rings are rated to 150 °C.

Bore form

Straight, cylindrical bore. It seats directly on a cylindrical shaft journal. Schaeffler spells the tapered-bore execution of this bearing NNU4932SK.M.SP, with an explicit K in the string, and no K appears here.

Quantity and configuration

One bearing, comprising both rings, the roller set and the cage.

Fitting notes

Shaft shoulder diameter: 177.2 mm to h12. Housing shoulder diameter: 206.5 mm to H12. Maximum recess radius: 2 mm. Minimum chamfer dimension: 2 mm. Inner ring raceway diameter: 178.5 mm. Axial displacement available: 2.7 mm. Internal Clearance: CN, the normal group. Operating temperature range: -30 °C to 150 °C.

Interchange guidance

Searchable variants: NNU4932M, NNU-4932-M, NNU 4932 M, NNU4932MB, NNU4932. Related sizes on the same envelope, each with a tapered 1:12 bore rather than a straight one: FAG NNU4932SK.M.SP, SKF NNU 4932 BK/SPW33, NSK NNU4932MBKR. NTN NNU4932 sits on the same envelope. On an NNU cylindrical roller a 1:12 bore mounts directly on a tapered spindle journal, so no adapter sleeve is involved either way.