FAGNNU4948-M-C5Double Row Cylindrical Roller Bearing — 240 mm ID, 320 mm OD, 80 mm Width, NNU Type, Brass Cage, C5 Clearance

Product Description

What this part is:

FAG NNU4948-M-C5 is a double-row cylindrical roller bearing of type NNU, in the 49 dimension series. Bore Diameter: 240 mm. Outside Diameter: 320 mm. Overall Width: 80 mm. Number Of Rows: 2. Bore Type: Straight. The ribs are on the outer ring and the inner ring is rib-free, so the bearing is non-locating and the inner ring is separable. Rolling Elements: Cylindrical Roller.

Decoding the designation:

NNU4948 — double-row NNU type, 49 dimension series, bore code 48 = 240 mm.

M — machined brass cage.

C5 — radial internal clearance larger than C4, the largest standard clearance group.

What these specs mean in practice:

Internal Clearance: C5. Cage Material: Machined brass. The thin 49-series section gives high radial capacity in a small radial height, with two roller rows for radial stiffness. C5 clearance suits heavy interference fits and large temperature differences between inner and outer rings.

Interchange guidance:

Same envelope and NNU double-row configuration as SKF NNU 4948 and NSK NNU4948 in the equivalent clearance group; cage execution follows each maker’s own catalogue.