YSA-208-2FK-HE-2308 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 YSA-208-2FK-HE-2308 model number is decoded

Listed in SKF 17000 chapter 2, YSA 208-2FK HE 2308 is a tapered-bore (1:12) insert bearing supplied on its HE 2308 adapter sleeve, 31.75x80x33.9 mm overall, whose convex spherical outer ring pivots in the spherical bore of a Y-pillow, Y-flange or take-up housing. Construction combines capped deep-groove geometry, a tapered inner-ring bore and the supplied adapter sleeve with locknut seating — factory-grade concentricity on plain drawn shafting. YSA is the adapter-sleeve member of the Y range — tapered bore plus the HE 2308 sleeve converts a plain commercial shaft into a precisely located, demountable seat at 31.75 mm. adapter mounting means the effective bore is the sleeve bore: HE 2308 gives the 31.75 mm shaft fit with no machined shoulder required. -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 31.75x80x33.9 mm (1.25x3.15x1.335 in), outer ring 21 mm wide, C 30.7 kN, C0 19 kN, Pu 0.8 kN. Mounted width B1 46 mm includes the adapter sleeve. Supplied/specified with HE 2308. The catalogue publishes a single speed ceiling, the limiting speed: 4,800 r/min; mass 770 g. Outer-vs-overall width: the outer ring is 21 mm wide inside the 33.9 mm total, so the extended inner ring accounts for 0.381 of the overall width (6.45 mm of axial projection per side). Rating split for the maintenance file: dynamic 30.7 kN (L10), static 19 kN (s0 shock check), fatigue 0.8 kN (adjusted life) — three separate uses for YSA 208-2FK HE 2308, none interchangeable with another. Width accounting: B1 46 mm covers the bearing WITH its adapter-sleeve hardware against 33.9 mm for the bearing itself and 21 mm outer-ring width; housing axial space is drawn to B1, seal replacement space to B. Spherical-seat note in numbers: the 80 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 55.875 = 175.536 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Fillet discipline: the printed minimum-fillet limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 31.75x80 mm insert on its chamfer tilts the whole spherical seat. Adapter-sleeve note: tighten the sleeve locknut to the catalogue axial drive-up (s1 is printed as the starting distance before the sleeve is driven into the tapered bore); under-tightening lets the inner ring creep, over-tightening eliminates internal clearance and preloads the balls hot. Sleeve geometry on YSA-208-2FK-HE-2308: HE 2308 pulls the tapered inner ring onto the 31.75 mm plain shaft; the printed s1 27.5 mm is the pre-drive distance and 46 mm is the overall width including the sleeve hardware.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The order number is incomplete without the sleeve: YSA-208-2FK-HE-2308 specifies the HE 2308 adapter as part of the article; quoting only the YSA bearing risks delivery of a sleeve-less tapered bore that cannot mount.
• Plain-shaft advantage is also its trap: with no shoulders, axial location comes entirely from the sleeve/nut reaction — the abutment behind the sleeve must be square and present.
• Sleeve drive-up uses the printed s1 27.5 mm starting distance, not a torque value guessed from locknut size; re-measure the residual gap after tightening rather than trusting feel.
• Catalogue ratings belong to YSA 208-2FK HE 2308 as the adapter two f execution; other order numbers of the YSA 208-2FK 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.