FAGNU324EM1.P5Cylindrical Roller Bearing – 120 mm ID, 260 mm OD, 55 mm Width, Single Row, Straight Bore, Ribless Inner Ring, Machined Brass Cage, P5 Precision, Outer Ring & Roller Set

Product Description

What this part is

FAG NU324EM1.P5 single-row cylindrical roller bearing, series NU3. Bore: 120 mm. Outside diameter: 260 mm. Width: 55 mm. Rolling elements: cylindrical rollers, one row. The NU design carries both guide ribs on the outer ring and runs on a plain, ribless inner ring, so the two rings separate and the bearing takes no axial load in either direction.

Quantity and configuration

Outer ring with the roller and cage assembly. One piece. An NU bearing is separable by design, and this is the outer-ring half of the pair.

Decoding the designation

NU: single row, ribs on the outer ring, ribless inner ring, non-locating. E: reinforced internal design with a larger roller complement. M1: machined brass cage. P5: ABEC 5 tolerance class. Carton and drawing markings in circulation: NU324 E M1 P5, NU-324-E-M1, NU324EM1, NU324E.M1.P5, R132.180, R-132-180.

What these specs mean in practice

Ratings for the complete NU324-E-M1 bearing: basic dynamic radial load rating 585 kN (131 500 lbf), basic static radial load rating 655 kN (147 000 lbf), limiting speed 3 400 rpm. On a cylindrical roller bearing the static rating sits at or above the dynamic rating — that is the normal relationship for the type. Line contact between roller and raceway gives far higher radial capacity and radial stiffness than a ball bearing in the same envelope. P5 tolerance means tighter bore, outside diameter and running-accuracy limits than the standard class, giving lower runout and closer shaft location.

Bore form

Straight bore, 120 mm. The ribless inner ring lets the shaft and inner ring float axially relative to the housing, which is what makes an NU the non-locating bearing in a two-bearing shaft arrangement.

Fitting notes

Inner ring raceway diameter: 154 mm. Outer ring raceway diameter: 230 mm. Minimum outer ring rib diameter: 218.7 mm. Minimum shaft shoulder diameter: 134 mm. Maximum shaft shoulder diameter: 151 mm. Maximum housing shoulder diameter: 246 mm. Maximum recess radius: 2.5 mm. Minimum chamfer: 3 mm. Permissible axial displacement: 3.5 mm. Operating temperature range: -30 °C to 150 °C. Weight: 28.5 lb.

Interchange guidance

Same-designation equivalents: SKF NU 324 ECM/P5, NTN NU324P5. Current Schaeffler designation for this envelope: NU324-E-XL-M1.