YEL-204-2F 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 YEL-204-2F model number is decoded

Listed in SKF 17000 chapter 2, YEL 204-2F is a eccentric-locking-collar insert bearing with the inner ring extended on both sides, 20x47x34.2 mm overall, whose convex spherical outer ring pivots in the spherical bore of a Y-pillow, Y-flange or take-up housing. Construction pairs capped deep-groove geometry with a one-piece eccentric locking collar and a convex outer ring — quick to mount on plain commercial shafts and tolerant of initial static misalignment. reading YEL: an eccentric locking collar does the shaft clamping (popular where shaft tolerance and quick removal matter), inner ring extended symmetrically both sides. the size code 204 carries the usual bore arithmetic — 20 mm — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. -2F decodes to contact seals with additional plain flingers, one set per side; the unit is grease-filled for life and the flinger is why the sealed width exceeds the open one-side execution. Envelope 20x47x34.2 mm (0.787x1.85x1.346 in), outer ring 14 mm wide, C 12.7 kN, C0 6.55 kN, Pu 0.28 kN. Mounted width B1 43.7 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 8,500 r/min; mass 200 g. Rating split for the maintenance file: dynamic 12.7 kN (L10), static 6.55 kN (s0 shock check), fatigue 0.28 kN (adjusted life) — three separate uses for YEL 204-2F, none interchangeable with another. Capacity density: 12.7 kN from 0.200 kg of bearing steel is about 63.5 kN per kilogram, and per width millimetre the 34.2 mm unit carries 0.371 kN of dynamic capacity. Outer-vs-overall width: the outer ring is 14 mm wide inside the 34.2 mm total, so the extended inner ring accounts for 0.591 of the overall width (10.1 mm of axial projection per side). Static-first planning: the 0.192 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 20 mm shaft, not the 12.7 kN L10 value. Speed ceiling of 8,500 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. Two-side sealed collar note: after driving the eccentric collar tight, lock the collar set screw against its recess and verify the collar cannot be turned by hand; a collar that was merely pressed on without the eccentric bite spins on the shaft and frets it within hours. Collar geometry for this size: over the 14 mm outer-ring width the inner ring runs to 34.2 mm overall (43.7 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 43.7 mm includes collar space — a housing sized for a grub-screw insert of the same OD can be too narrow axially for the YEL collar.
• The eccentric collar is handed to running direction; fit it wrong on the 20 mm shaft and self-tightening becomes self-loosening. Mark the shaft rotation before stripping any YEL2 collar unit.
• 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 12.7/6.55 kN figures belong specifically to YEL 204-2F; 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.