SKF double row cylindrical roller bearings wholesaler

SKF double row cylindrical roller bearings are available in several designs with a cylindrical or tapered bore. The SKF standard assortment presented in this section includes:

NNU design bearings
NN design bearings
NNUP design bearings
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SKF double row cylindrical roller bearing features

High load carrying capacity
Because of their second row of rollers, double row cylindrical roller bearings are suitable for heavy radial loads.

Low friction (Roller end / flange contact area)
The open flange design, together with the roller end design and surface finish, promote lubricant film formation resulting in lower friction and higher axial load carrying capacity.

Long service life
The logarithmic roller profile reduces edge stresses at the roller/raceway contact and sensitivity to misalignment and shaft deflection.

Enhanced operational reliability
The surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.

Separable and interchangeable
The separable components of SKF double row cylindrical roller bearings are interchangeable. This facilitates mounting and dismounting, as well as maintenance inspections.

High speed capability
The cage designs are suitable for high speeds, rapid accelerations and impact loads.

SKF double row cylindrical roller bearing features

SKF basic design double row cylindrical roller bearings are available in several designs. The major design differences between the bearings are the configuration of the inner and outer ring flanges and the cage design and material. The most popular designs are:

Bearing design	Flange configurations	Cage design
NNU design	outer ring: three integral inner ring: none	one cage machined brass or steel double prong-type roller centred
NNU.1 design	outer ring: three integral inner ring: none	two cages machined brass window-type roller centred
NNU.2 design	outer ring: one integral central and two loose inner ring: none	one cage machined brass or steel double prong-type roller centred
NNU.3 design	outer ring: three integral inner ring: none	two cages machined steel pin-type pierced rollers
NNU.4 design	outer ring: one integral central and two loose inner ring: none	two cages machined steel pin-type pierced rollers
NNU.5 design	outer ring: two integral inner ring: none	one cage machined brass window-type roller centred
NNU.6 design	outer ring: two integral inner ring: none	one cage machined steel pin-type pierced rollers
NNU.7 design	outer ring: one integral and one loose inner ring: none	one cage machined brass window-type roller centred
NNUB design	outer ring: three integral extended inner ring: none	one cage machined brass or steel double prong-type roller centred
NNUB.1 design	outer ring: one integral central and two loose extended inner ring: none	one cage machined brass or steel double prong-type roller centred
NNUB.2 design	outer ring: two integral extended inner ring: none	one cage machined brass window-type roller centred
NNUB.3 design	outer ring: two integral extended inner ring: none	one cage machined steel pin-type pierced rollers
NNUB.4 design	outer ring: three integral extended inner ring: none	two cages machined brass window-type roller centred
NNUB.5 design	outer ring: one integral central and two loose extended inner ring: none	two cages machined steel pin-type pierced rollers
NNUP design	outer ring: three integral inner ring: one integral and two loose	one cage machined brass or steel double prong-type roller centred
NNUP.1 design	outer ring: two integral and one loose inner ring: one integral and one loose	two cages machined steel pin-type pierced rollers
NN design	outer ring: none inner ring: three integral	one cage machined brass or steel double prong-type roller centred
NN.1 design	outer ring: none inner ring: three integral	two cages either PA66 or stamped steel window-type roller centred
NN.2 design	outer ring: none inner ring: three integral	two cages machined steel pin-type pierced rollers
NN.3 design	outer ring: none inner ring: one integral and two loose	two cages machined steel pin-type pierced rollers