NSKNN3018KMBE1CC1P4Double-Row Super-Precision Cylindrical Roller Bearing – 1:12 Tapered Bore, 90 mm ID, 140 mm OD, 37 mm Width, 2 Rows, Machined Brass Cage, CC1 Clearance, ABEC 7

Product Description

What this part is

NSK NN3018KMBE1CC1P4 double-row cylindrical roller bearing, super-precision spindle type. Bore 90 mm, outside diameter 140 mm, width 37 mm. Tapered bore, open, two rows of cylindrical rollers, machined brass cage.

Decoding the designation

NN marks the double-row precision cylindrical roller family, 30 is the dimension series and 18 is the bore code, giving a 90 mm bore. K denotes a 1:12 tapered bore. MB is a machined brass cage. P4 is ISO Class 4, equivalent to ABEC 7, which the carton also states as ABEC7. CC1 is NSK’s non-interchangeable radial clearance code for this range.

Bore form

On an NN cylindrical roller bearing the 1:12 tapered bore seats directly on a matching tapered spindle journal. Axial position of the inner ring on that taper sets the running clearance, so the fitter controls clearance by drive-up rather than by selecting a clearance class at purchase.

What these specs mean in practice

Two rows of cylindrical rollers give very high radial capacity and radial stiffness in a short axial envelope, which is why this type carries the front bearing position on machine tool spindles. The type is non-locating, so a separate bearing takes the axial load and sets shaft position. A machined brass cage tolerates high speed, high temperature and oil-jet lubrication better than a pressed cage, and ISO Class 4 holds ring runout to super-precision limits.

Quantity and configuration

One piece, one complete double-row bearing.

Fitting notes

Drive-up on the taper is measured, since it sets radial clearance directly. The outer ring of an NN type is a plain sleeve without ribs and locates axially in the housing bore.

Interchange guidance

Same-specification equivalents are the SKF NN 3018 K/SPW33, the FAG NN3018-AS-K-M-SP and the NTN NN3018K. The NN3016K also printed on this carton is an 80 mm bore in a 125 x 34 mm envelope, so it is a related size rather than a substitution.