RKB ball bearings
The ball bearings (BBs) manufactured by RKB come in many designs, dimensions and series. They are conceived to withstand combined loads and high speeds, covering most requirements in a number of standard and special industrial applications. All RKB BBs are made from high quality materials and special heat treatments for superior performance.
Available in single and double row con guration, in open or sealed version, they are low-maintenance, which makes them an irreplaceable cost-effective solution in many cases. For large size BBs, RKB can also apply Bainite Hardening Treatment (HB) and High Temperature Dimensional Stabilization (S) on rings and balls. The bearing dimensional and running accuracy conforms to ISO/ABMA/GOST speci cations.
Angular contact ball bearings
The angular contact ball bearings (ACBBs) produced by RKB are used in a wide array of machines where combined loads, high speeds and runout accuracy are required. Available in single or double row con guration, they can be manufactured with different types of cage (machined brass, pressed steel or polyamide) and dimensional precisions.
Single row ACBBs can be directly paired by RKB in face-to-face (DF) or back- to-back (DB) con guration, depending on load conditions, presence of tilting moments and misalignment magnitude in the application.
M type Angular ball bearings
One-piece inner and outer ring One-piece machined brass cage guided on balls (M) Available with machined brass cage guided on inner ring (MB)
Single non-universal bearing execution Suitable for very high operating speeds Available with 25°, 30° or 40° contact angle
QJ type Angular ball bearings
One-piece outer ring Two-piece inner ring circumferentially split One-piece machined brass cage guided on outer ring (MA)
Supports only axial loads
Two locating slots (N2)
Available also with one-piece inner ring and two-piece outer ring (Q)
DB type Angular ball bearings
Back-to-back arrangement (DB) of two ACBBs One-piece machined brass cage guided on balls (M) Preset or adjusted BEP on customers request Available with machined brass cage guided on inner ring (MB)
Available with inner and/or outer spacers featuring lubrication grooves and/or lubrication holes
Stiffer arrangement to withstand tilting moments
DF type Angular ball bearings
Face-to-face arrangement (DF) of two ACBBs One-piece machined brass cage guided on balls (M)
Preset or adjusted BEP on customers request Available with machined brass cage guided on inner ring (MB)
Available with inner and/or outer spacers featuring lubrication grooves and/or lubrication holes
DB+ZZ type Angular ball bearings
Double row ACBB back-to-back arrangement (DB) Non-separable shielded design (ZZ)
Moulded glass ber reinforced polyamide snap-in cage guided on balls (TN)
Available with lubrication holes in the inner ring
Shielded type to keep the grease inside the
bearing without compromising the limiting speed Supports high combined loads
DFM type Angular ball bearings
Double row ACBB face-to-face arrangement (DF) Non-separable open design
One-piece machined brass cage guided on inner ring (MB)
Lubrication grooves and holes in outer rings Supports high combined loads
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RKB spherical roller bearings
The spherical roller bearings (SRBs) manufactured by RKB are engineered to withstand high radial forces and moderate axial forces acting in both directions. RKB SRBs can dynamically accommodate misalignments due to shaft bending. They are produced with cylindrical or tapered bore, in open or sealed execution. Depending on application requirements, RKB Bainite Hardening Treatment (HB) and High Temperature Dimensional Stabilization (S) can be applied on bearing rings and rollers. Moreover, as for dimensions, RKB spherical roller bearings are manufactured according to ISO/ABMA/GOST speci cations. As a consequence, they are fully interchangeable with all the bearings that meet the relevant international standards.Tailor made solutions spherical roller bearings
Besides the main spherical roller bearing designs, RKB has developed new solutions according to speci c application requirements.The special designs include SEALED SRBs, for smooth operation in contaminated environments, ROVSX type, expressly designed for vibratory equipment, WOR execution, suitable for gear output shaft of truck concrete mixers, and SPLIT bearings to make maintenance operations easier at hard-to-reach positions.If duly applied, these special designs are cost effective for the customer, since they allow increased bearing life expectancy and reduced machine downtime