YET-203-15 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 YET-203-15 model number is decoded

The YEL2 series order number YET 203/15 is a SKF insert bearing (Y-bearing) for a 15 mm shaft: eccentric-locking-collar insert bearing with a one-side-extended inner ring, built to the ISO 15 diameter-series envelope with a sphered OD of 40 mm. Inside sits a sealed ball insert with an eccentric collar on the extended ring: collar bite locks the shaft, the contact seals retain the life grease, and the spherical OD floats in the Y-housing. YET means collar locking instead of grub screws — fit the eccentric collar, turn it in the rotation direction until it grips, then lock the collar's own setscrew; the inner ring is extended on one side. the slash tail names a non-standard metric bore directly: YET 203/15 is the 15 mm bore execution of the size series. with no -2F/-2RF suffix the order number denotes the open external execution of the YEL2 size — add external exclusion at the housing and plan relubrication intervals for dusty or wet surroundings. Envelope 15x40x19.1 mm (0.591x1.575x0.752 in), outer ring 12 mm wide, C 9.56 kN, C0 4.75 kN, Pu 0.2 kN. Mounted width B1 28.6 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 9,500 r/min; mass 120 g. Mass-to-load ratio for YET-203-15: 12.552 g of catalogue mass per rated kN of C, and 8 g per millimetre of bore — useful when comparing executions of the same 15x40 mm envelope on the drawing. Envelope arithmetic: the radial section from 15 mm bore to 40 mm OD is 12.5 mm; dividing C 9.56 kN by that section gives 0.765 kN per section millimetre, and the 19.1 mm overall width is 1.528x the section. Speed ceiling of 9,500 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. Spherical-seat note in numbers: the 40 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 27.5 = 86.394 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Fatigue-limit check: Pu 0.2 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YET 203/15 — most belt-driven mounted-unit loads sit comfortably under 2.092 % of C. One-side collar note: the eccentric collar mounts on the extended side only and must turn in the shaft rotation direction to self-tighten; on reversing drives this design can loosen by design intent — choose grub-screw or ConCentra locking for true bidirectional shafts. Collar geometry for this size: over the 12 mm outer-ring width the inner ring runs to 19.1 mm overall (28.6 mm including the eccentric collar width), giving the collar its eccentric seating face clear of the seal.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Overall width 28.6 mm includes collar space — a housing sized for a grub-screw insert of the same OD can be too narrow axially for the YET collar.
• Never pin or weld the eccentric collar: the controlled eccentric friction is the locking principle, and pinning turns a demountable insert into a shaft-replacement job.
• The eccentric collar is handed to running direction; fit it wrong on the 15 mm shaft and self-tightening becomes self-loosening. Mark the shaft rotation before stripping any YEL2 collar unit.
• The 9.56/4.75 kN figures belong specifically to YET 203/15; 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.