YSP-209-SB-2F bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-28

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the YSP-209-SB-2F model number is decoded

The YSP2 series order number YSP 209 SB-2F is a SKF insert bearing (Y-bearing) for a 45 mm shaft: SKF ConCentra insert bearing with concentric stepped-sleeve locking and symmetrically extended inner ring, built to the ISO 15 diameter-series envelope with a sphered OD of 85 mm. Inside is a capped ball insert whose extended inner ring tapers onto a multi-step locking sleeve; the sleeve grips the shaft around its full circumference and the spherical outer ring pivots in the housing. YSP denotes the ConCentra design — the SB execution in this chapter has the shortened inner ring; axial driving of the stepped sleeve produces a near-true concentric clamp with virtually no run-out penalty. the size code 209 carries the usual bore arithmetic — 45 mm (code 09 x 5) — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. the -2F external design pairs a nitrile contact seal with a plain sheet-steel thrower on both sides — a two-stage exclusion chain of flinger first, sealing lip second, typical of farm and conveyor duty. Envelope 45x85x44.2 mm (1.772x3.346x1.74 in), outer ring 22 mm wide, C 33.2 kN, C0 21.6 kN, Pu 0.915 kN. The catalogue publishes a single speed ceiling, the limiting speed: 4,300 r/min; mass 660 g. Load balance for documentation: C0 21.6 kN against C 33.2 kN gives a 0.651 ratio; mounted-unit positions with shock and standstill loading are normally checked on C0, while conveyor and fan duty are evaluated on the L10 figure. Static-first planning: the 0.489 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 45 mm shaft, not the 33.2 kN L10 value. Speed ceiling of 4,300 r/min is the catalogue mechanical limit for THIS execution; seal lip and flinger drag, not steel fatigue, are normally what cap it, so real fan duty is planned well below it. Envelope arithmetic: the radial section from 45 mm bore to 85 mm OD is 20 mm; dividing C 33.2 kN by that section gives 1.66 kN per section millimetre, and the 44.2 mm overall width is 2.21x the section. Pitch-diameter arithmetic: dm = (45+85)/2 = 65 mm; at the 4,300 r/min limiting speed the ball set runs at dn approx 2.79x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. ConCentra mounting note: the SB shortened-inner-ring sleeve is driven AXIALLY with the proper sleeve/drift until it seats against the abutment — driving at an angle burrs the stepped sleeve and destroys the concentricity advantage; removal needs the matching withdrawal technique, never a puller on the flingers. Sleeve geometry: the ConCentra stepped sleeve occupies the symmetric extension up to the 44.2 mm overall width while the sphered outer ring stays 22 mm wide — uniform sleeve contraction is why run-out stays low at 45 mm bore.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The SB shortened-inner-ring ConCentra unit needs its matching mounting sleeve and procedure; substituting a standard YSP sleeve or a generic drift is the usual cause of crooked drive-up on the 45 mm shaft.
• ConCentra solves run-out and fretting but not gross misalignment — the housing spherical seat still carries that function; do not use the sleeve grip as an excuse to skip housing alignment.
• Inspect the shaft before sleeve mounting: a single deep keyway burr or old screw-point dimple under the 44.2 mm-wide sleeve causes a local unclamped arc that later frets.
• Catalogue ratings belong to YSP 209 SB-2F as the concentra two f execution; other order numbers of the YSP 209 size are different articles (open vs sealed, plain vs rubberized flinger, stainless vs carbon steel) and may carry different ratings or speeds — always quote the full designation.