YSP-205-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-205-SB-2F model number is decoded

YSP 205 SB-2F is SKF's 25 mm-bore SKF ConCentra insert bearing with concentric stepped-sleeve locking and symmetrically extended inner ring in the YSP2 series — a Y-bearing with a spherically ground outside surface for static self-alignment inside a matching SKF Y-housing, boundary dimensions 25x52x33.2 mm. The ConCentra principle replaces point or eccentric clamping: a stepped sleeve between shaft and inner ring is driven axially to contract uniformly, concentric with the sphered-OD sealed ball insert. the YSP prefix names SKF ConCentra locking: a stepped (multi-diameter) sleeve between shaft and inner ring is driven axially to grip concentrically, avoiding the local shaft fretting of set screws or the imbalance of an eccentric collar. the size code 205 carries the usual bore arithmetic — 25 mm — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. suffix -2F means an NBR rubber contact seal plus a plain pressed-steel flinger on EACH side: the lip rides the extended inner ring while the flinger sheds coarse contamination before it reaches the lip. Envelope 25x52x33.2 mm (0.984x2.047x1.307 in), outer ring 15 mm wide, C 14 kN, C0 7.8 kN, Pu 0.335 kN. The catalogue publishes a single speed ceiling, the limiting speed: 7,000 r/min; mass 190 g. Grease-life arithmetic is dominated by speed: at dn approx 2.69x10^5 the sealed-for-life fill is planned for the catalogue's grease-life regime, which is why the limiting speed and the relubrication interval move together, and high-temperature mounts shorten both even when load is light. Imperial procurement cross-check: 0.984 in bore, 2.047 in OD, 1.307 in overall width; the 190 g mass converts to 0.190 kg (6.7 oz) for the bill of materials. Bore-to-OD planning: OD 52 over bore 25 is a 2.08x step, while bore/overall-width gives 0.753; the spherical seat in the matching Y-housing must be specified to the 52 mm OD, not to a cylindrical housing bore. Spherical-seat note in numbers: the 52 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 38.5 = 120.951 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Fatigue-limit check: Pu 0.335 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YSP 205 SB-2F — most belt-driven mounted-unit loads sit comfortably under 2.393 % of C. 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. Reuse note for YSP-205-SB-2F: the stepped locking sleeve is a one-time clamping component in most over-torque cases; if the 25 mm shaft shows a polished sleeve imprint after withdrawal, fit a new sleeve rather than re-driving the old one.

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 25 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 33.2 mm-wide sleeve causes a local unclamped arc that later frets.
• Catalogue ratings belong to YSP 205 SB-2F as the concentra two f execution; other order numbers of the YSP 205 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.