FAGNU1052FP5Cylindrical Roller Bearing 260 x 400 x 65 mm, NU Non-Locating, Low Section, P5 Class, C3 Clearance

Product Description

What this part is

A FAG NU1052-F-P53 single-row cylindrical roller bearing — 260 mm bore, 400 mm outside diameter, 65 mm wide, in the non-locating NU design with a machined steel cage, P5 tolerance class and C3 internal clearance.

Decoding the designation

NU — ribless inner ring, non-locating: the shaft passes through free to move axially
1052 — NU10 dimension series, FAG’s very low cross-section cylindrical family, bore code 52 for 260 mm
F — machined solid steel cage, roller-guided
P53 — FAG’s combined code: P5 tolerance class with C3 internal clearance, built the same way as FAG’s P63 (P6 + C3)

What these specs mean in practice

The 10 series is the shallowest cylindrical section FAG builds: a 70 mm wall over a 260 mm bore, so it fits where the housing outside diameter is fixed and there is no room for a 2 or 3 series. The trade is capacity — a smaller roller in a thinner ring — in exchange for a compact envelope and lower mass. NU means no ribs on the inner ring, so the bearing carries radial load and lets a long shaft grow axially through it; an NJ locates one direction and an NUP both. P5 tightens bore, outside diameter and running accuracy well beyond normal class, and pairing it with C3 is deliberate: the accuracy is in the ring geometry while the internal play stays generous enough for a heavy interference fit and thermal growth. A machined steel cage guided on the rollers handles higher loads and speeds than a pressed cage and stays dimensionally stable at temperature.

Published specifications

Bore: 260 mm (10.236 in)
Outside diameter: 400 mm (15.748 in)
Width: 65 mm (2.559 in)
Rows: 1
Rolling element: cylindrical roller
Cage: machined solid steel, roller-guided (F)
Precision class: P5 (ISO class 5)
Internal clearance: C3, greater than normal
Axial location: non-locating — radial load only
Closure: open
Separable: yes — the ribless inner ring lifts out of the roller-and-outer assembly

Quantity and configuration

1 Pc. Complete bearing — ribbed outer ring, roller complement in the machined steel cage, and the ribless inner ring.

Interchange guidance

The ISO base number NU1052 identifies the same envelope across brands: SKF NU 1052 MA, NSK NU1052M and NTN NU1052 are the same 260 × 400 × 65 mm non-locating size. Those are same-envelope related sizes unless matched on precision as well — a normal-class NU1052 is not a substitute for a P5 unit, and P5 with C3 is the specific combination here. An NJ1052 locates one direction and an NUP1052 both, so they differ in axial function. An NU1052-M1 is the machined brass cage variant of the same bearing.