SKFNN3026-KMC/C481Double Row Cylindrical Roller Bearing – 130 mm ID, 200 mm OD, 52 mm Width, Tapered 1:12 Bore, Machined Brass Cage, Open, C481 Special Internal Specification

Product Description

What this part is

SKF NN3026-KMC/C481 double-row cylindrical roller bearing. Series NN30. Bore: 130 mm. Outside diameter: 200 mm. Width: 52 mm. Two rows of cylindrical rollers, ribs on the inner ring, plain separable outer ring. Rolling elements: cylindrical rollers, 2 rows.

Decoding the designation

NN: double-row cylindrical roller with a ribbed inner ring. K: tapered bore, 1:12 taper. MC: machined brass cage. C481: a special internal specification to a drawing beyond the standard catalogue execution. Punctuation variants in circulation: NN 3026 K M C481, NN3026KMC481, NN-3026-K-M-C481, NN3026 KMC C481.

What these specs mean in practice

Basic dynamic radial load rating: 290 kN (65 194 lbf). Basic static radial load rating: 450 kN (101 164 lbf). On a cylindrical roller bearing the static rating sits above the dynamic rating — that is the normal relationship for the type. Limiting speed: 5 300 rpm. Line contact between roller and raceway gives a much higher radial capacity and higher radial stiffness than a ball bearing in the same envelope. The two rows are radial-only, so a separate bearing takes the axial load in a spindle arrangement.

Bore form

The 1:12 tapered bore mounts directly on a matching tapered spindle journal. Driving the inner ring up the taper expands it and sets the radial internal clearance by measurement during assembly, which is how running clearance is dialled in on a precision spindle.

Quantity and configuration

One bearing, complete: inner ring with both roller rows and cages, plus the outer ring.

Fitting notes

Open on both faces. Operating temperature range: -30 °C to 150 °C. Lubrication: oil or grease. Weight: 13.00 lb (5.9 kg).

Interchange guidance

Same-envelope designations: FAG NN3026-AS-K-M-SP, NSK NN3026MBKRE4, NTN NN3026, Koyo NN3026K, Timken NN3026K. Related sizes: NN 3026 (straight bore, no taper) and NN 3026 K with a polyamide cage execution.