ConsolidatedNN3017KMP51Precision Double Row Cylindrical Roller Bearing 85x130x34 mm 1:12 Tapered Bore Machined Brass Cage P51 Class

Product Description

What this part is

A precision double-row cylindrical roller bearing in the NN3017 envelope, 85 mm bore × 130 mm outside diameter × 34 mm width, with a 1:12 tapered bore, a machined brass cage and a P51 precision class.

Decoding the designation

NN — double-row cylindrical roller bearing, integral inner-ring flanges, separable outer ring
30 — dimension series 30
17 — bore code, 85 mm bore
K — 1:12 tapered bore
M — machined brass cage
P51 — precision class 5 dimensional tolerance with tightened running accuracy, the machine tool spindle grade

What these specs mean in practice

Two rows of cylindrical rollers in a narrow section carry very high radial load with high radial stiffness and no axial capacity, so axial location comes from a separate thrust or angular contact bearing. The K tapered bore seats directly on a 1:12 tapered spindle journal; axial draw-up on that taper sets radial internal clearance and preload, which is how this family is adjusted in service. P51 tightens bore, outside diameter and radial runout well beyond normal class, which is what keeps spindle runout low at the tool. The machined brass cage tolerates higher temperature and shock loading than a polyamide cage and suits oil-jet or oil-mist lubrication.

Quantity and configuration

Unit quantity: 1 Pc
Bore: 1:12 taper, mounted directly on a tapered journal
Rows: 2, cylindrical rollers

Fitting notes

Clearance is set by axial draw-up of the inner ring along the tapered journal and measured with a bore gauge before and after seating. No adapter sleeve is involved. The outer ring is separable and stays paired with its own roller-and-inner assembly.

Interchange guidance

Written also as NN 3017 K M P51, NN-3017-K-M-P51, NN3017KMSP and NN3017KM P51. Same-envelope NN3017 bearings with a cylindrical bore, a pressed-steel or polyamide cage, or a normal precision class are related sizes rather than interchanges.