YEL-208-2F 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-208-2F model number is decoded

The YEL2 series order number YEL 208-2F is a SKF insert bearing (Y-bearing) for a 40 mm shaft: eccentric-locking-collar insert bearing with the inner ring extended on both sides, built to the ISO 15 diameter-series envelope with a sphered OD of 80 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. YEL 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 both sides. the size code 208 carries the usual bore arithmetic — 40 mm (code 08 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 40x80x42.8 mm (1.575x3.15x1.685 in), outer ring 21 mm wide, C 30.7 kN, C0 19 kN, Pu 0.8 kN. Mounted width B1 56.3 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 4,800 r/min; mass 700 g. Pitch-diameter arithmetic: dm = (40+80)/2 = 60 mm; at the 4,800 r/min limiting speed the ball set runs at dn approx 2.88x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. Speed ceiling of 4,800 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. Fillet discipline: the printed r_min 1 mm limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 40x80 mm insert on its chamfer tilts the whole spherical seat. Bore-to-OD planning: OD 80 over bore 40 is a 2x step, while bore/overall-width gives 0.935; the spherical seat in the matching Y-housing must be specified to the 80 mm OD, not to a cylindrical housing bore. Fatigue-limit check: Pu 0.8 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YEL 208-2F — most belt-driven mounted-unit loads sit comfortably under 2.606 % of C. 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. Direction rule for YEL-208-2F: the eccentric collar self-tightens in the shaft's running direction, so mark rotation at mounting; the 40 mm shaft must be free of burrs under the collar or the eccentric cannot bed flat.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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 40 mm shaft and self-tightening becomes self-loosening. Mark the shaft rotation before stripping any YEL2 collar unit.
• Overall width 56.3 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.
• Ordering discipline for the 40 mm size: the chapter lists several executions side by side (YEL2 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.