YSA-205-2FK-H-2305 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-205-2FK-H-2305 model number is decoded

Listed in SKF 17000 chapter 2, YSA 205-2FK H 2305 is a tapered-bore (1:12) insert bearing supplied on its H 2305 adapter sleeve, 20x52x24 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 H 2305 sleeve converts a plain commercial shaft into a precisely located, demountable seat at 20 mm. adapter mounting means the effective bore is the sleeve bore: H 2305 gives the 20 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 20x52x24 mm (0.787x2.047x0.945 in), outer ring 15 mm wide, C 14 kN, C0 7.8 kN, Pu 0.335 kN. Mounted width B1 35 mm includes the adapter sleeve. Supplied/specified with H 2305. The catalogue publishes a single speed ceiling, the limiting speed: 7,000 r/min; mass 250 g. Grease-life arithmetic is dominated by speed: at dn approx 2.52x10^5 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. Imperial procurement cross-check: 0.787 in bore, 2.047 in OD, 0.945 in overall width; the 250 g mass converts to 0.250 kg (8.8 oz) for the bill of materials. Fillet discipline: the printed minimum-fillet limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 20x52 mm insert on its chamfer tilts the whole spherical seat. The s1 20.5 mm dimension is printed for the locking zone — the distance before the adapter sleeve is driven up the taper — and it is verified at mounting, not recoverable from d/D/B alone. At the printed limiting speed of 7,000 r/min the mean diameter dm = 36 mm implies dn about 2.52x10^5 mm.r/min — the speed-demand figure used when comparing this insert with open deep-groove sizes of the same bore. 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. Mounting sequence for YSA-205-2FK-H-2305: slide H 2305 on first, seat the bearing in the housing register, then draw the nut to drive-up — reversing the order (sleeve fully tightened before housing engagement) locks in misalignment the sphered seat cannot cure.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The order number is incomplete without the sleeve: YSA-205-2FK-H-2305 specifies the H 2305 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 20.5 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 205-2FK H 2305 as the adapter two f execution; other order numbers of the YSA 205-2FK 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.