YSP-211-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-211-SB-2F model number is decoded

The YSP2 series order number YSP 211 SB-2F is a SKF insert bearing (Y-bearing) for a 55 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 100 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 211 carries the usual bore arithmetic — 55 mm (code 11 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 55x100x49.2 mm (2.165x3.937x1.937 in), outer ring 25 mm wide, C 43.6 kN, C0 29 kN, Pu 1.25 kN. The catalogue publishes a single speed ceiling, the limiting speed: 3,600 r/min; mass 980 g. Width accounting on this execution: 49.2 mm overall and 25 mm outer-ring width leave the housing designer 24.2 mm of inner-ring projection to accommodate the locking arrangement. Fatigue-limit check: Pu 1.25 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YSP 211 SB-2F — most belt-driven mounted-unit loads sit comfortably under 2.867 % of C. Outer-vs-overall width: the outer ring is 25 mm wide inside the 49.2 mm total, so the extended inner ring accounts for 0.492 of the overall width (12.1 mm of axial projection per side). Spherical-seat note in numbers: the 100 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 77.5 = 243.473 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Rating split for the maintenance file: dynamic 43.6 kN (L10), static 29 kN (s0 shock check), fatigue 1.25 kN (adjusted life) — three separate uses for YSP 211 SB-2F, none interchangeable with another. 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 49.2 mm overall width while the sphered outer ring stays 25 mm wide — uniform sleeve contraction is why run-out stays low at 55 mm bore.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Inspect the shaft before sleeve mounting: a single deep keyway burr or old screw-point dimple under the 49.2 mm-wide sleeve causes a local unclamped arc that later frets.
• 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.
• 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 55 mm shaft.
• The 43.6/29 kN figures belong specifically to YSP 211 SB-2F; HV stainless, AG agricultural and VE495 zinc-plated variants of the same envelope publish derated values, so write the complete order number including suffixes on the purchase and maintenance records.