YSP-208-108-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-208-108-SB-2F model number is decoded

YSP 208-108 SB-2F is SKF's 38.099999999999994 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 38.099999999999994x80x43.1 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 three-digit -108 tail codes the bore in inches for inch-shaft bearings: 1 whole inch 8/16 in = 38.1 mm (first digit whole inches, next two sixteenths of an inch). 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 38.099999999999994x80x43.1 mm (1.5x3.15x1.697 in), outer ring 21 mm wide, C 30.7 kN, C0 19 kN, Pu 0.8 kN. The catalogue publishes a single speed ceiling, the limiting speed: 4,800 r/min; mass 620 g. Fatigue-limit check: Pu 0.8 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YSP 208-108 SB-2F — most belt-driven mounted-unit loads sit comfortably under 2.606 % of C. Inner-geometry cross-reference: the catalogue shoulder diameters (d1 51.8 mm, d2 62 mm) set the shaft-abutment and sleeve limits; an abutment larger than these numbers contacts the seal or the plain flinger. Grease-life arithmetic is dominated by speed: at dn approx 2.83x10^5 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. Static-first planning: the 0.441 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 38.099999999999994 mm shaft, not the 30.7 kN L10 value. Bore-to-OD planning: OD 80 over bore 38.099999999999994 is a 2.1x step, while bore/overall-width gives 0.884; the spherical seat in the matching Y-housing must be specified to the 80 mm OD, not to a cylindrical housing bore. 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 43.1 mm overall width while the sphered outer ring stays 21 mm wide — uniform sleeve contraction is why run-out stays low at 38.099999999999994 mm bore.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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 38.099999999999994 mm shaft.
• Inspect the shaft before sleeve mounting: a single deep keyway burr or old screw-point dimple under the 43.1 mm-wide sleeve causes a local unclamped arc that later frets.
• Ordering discipline for the 38.099999999999994 mm size: the chapter lists several executions side by side (YSP2 locking style x seal package x application variant); a bare-number substitution needs a fresh dimension, speed and rating check rather than a like-for-like assumption.