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

YSA 208-2FK H 2308 is SKF's 35 mm-bore tapered-bore (1:12) insert bearing supplied on its H 2308 adapter sleeve in the YSA2 series — a Y-bearing with a spherically ground outside surface for static self-alignment inside a matching SKF Y-housing, boundary dimensions 35x80x33.9 mm. The inner ring carries a 1:12 tapered bore and mounts on the specified adapter sleeve: tightening the sleeve nut draws the ring home on a plain shaft, while the sphered outer ring pivots in the Y-housing. YSA names the tapered-bore (K, 1:12 taper) insert mounted on an adapter sleeve: the H 2308 sleeve is drawn up the taper to clamp a plain 35 mm shaft with a locknut, giving the concentricity and easy mounting of adapter-sleeve bearings. the shaft diameter is set by the H 2308 adapter sleeve, not by the bearing code: the sleeve seats a 35 mm plain shaft under the tapered bore. suffix -2F means an NBR rubber contact seal plus a plain pressed-steel flinger on EACH side: the lip rides the extended inner ring while the flinger sheds coarse contamination before it reaches the lip. Envelope 35x80x33.9 mm (1.378x3.15x1.335 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 H 2308. The catalogue publishes a single speed ceiling, the limiting speed: 4,800 r/min; mass 710 g. Bore-to-OD planning: OD 80 over bore 35 is a 2.286x step, while bore/overall-width gives 1.032; the spherical seat in the matching Y-housing must be specified to the 80 mm OD, not to a cylindrical housing bore. Envelope arithmetic: the radial section from 35 mm bore to 80 mm OD is 22.5 mm; dividing C 30.7 kN by that section gives 1.364 kN per section millimetre, and the 33.9 mm overall width is 1.507x the section. 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. Static-first planning: the 0.56 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 35 mm shaft, not the 30.7 kN L10 value. Grease-life arithmetic is dominated by speed: at dn approx 2.76x10^5 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. 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-H-2308: H 2308 pulls the tapered inner ring onto the 35 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

• 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.
• The order number is incomplete without the sleeve: YSA-208-2FK-H-2308 specifies the H 2308 adapter as part of the article; quoting only the YSA bearing risks delivery of a sleeve-less tapered bore that cannot mount.
• Ordering discipline for the 35 mm size: the chapter lists several executions side by side (YSA2 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.