YSA-209-2FK-HE-2309 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-209-2FK-HE-2309 model number is decoded

YSA 209-2FK HE 2309 is SKF's 38.1 mm-bore tapered-bore (1:12) insert bearing supplied on its HE 2309 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 38.1x85x35 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 HE 2309 sleeve is drawn up the taper to clamp a plain 38.1 mm shaft with a locknut, giving the concentricity and easy mounting of adapter-sleeve bearings. the shaft diameter is set by the HE 2309 adapter sleeve, not by the bearing code: the sleeve seats a 38.1 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 38.1x85x35 mm (1.5x3.346x1.378 in), outer ring 22 mm wide, C 33.2 kN, C0 21.6 kN, Pu 0.915 kN. Mounted width B1 50 mm includes the adapter sleeve. Supplied/specified with HE 2309. The catalogue publishes a single speed ceiling, the limiting speed: 4,300 r/min; mass 880 g. Pitch-diameter arithmetic: dm = (38.1+85)/2 = 61.55 mm; at the 4,300 r/min limiting speed the ball set runs at dn approx 2.65x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. At the printed limiting speed of 4,300 r/min the mean diameter dm = 61.55 mm implies dn about 2.65x10^5 mm.r/min — the speed-demand figure used when comparing this insert with open deep-groove sizes of the same bore. Static-first planning: the 0.617 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 38.1 mm shaft, not the 33.2 kN L10 value. Fillet discipline: the printed minimum-fillet limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 38.1x85 mm insert on its chamfer tilts the whole spherical seat. Outer-vs-overall width: the outer ring is 22 mm wide inside the 35 mm total, so the extended inner ring accounts for 0.371 of the overall width (6.5 mm of axial projection per side). 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-209-2FK-HE-2309: slide HE 2309 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

• Sleeve drive-up uses the printed s1 29 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-209-2FK-HE-2309 specifies the HE 2309 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.
• The 33.2/21.6 kN figures belong specifically to YSA 209-2FK HE 2309; 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.