YSA-211-2FK-HE-2311 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-211-2FK-HE-2311 model number is decoded

YSA 211-2FK HE 2311 is SKF's 50.8 mm-bore tapered-bore (1:12) insert bearing supplied on its HE 2311 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 50.8x100x40 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 2311 sleeve is drawn up the taper to clamp a plain 50.8 mm shaft with a locknut, giving the concentricity and easy mounting of adapter-sleeve bearings. the shaft diameter is set by the HE 2311 adapter sleeve, not by the bearing code: the sleeve seats a 50.8 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 50.8x100x40 mm (2x3.937x1.575 in), outer ring 25 mm wide, C 43.6 kN, C0 29 kN, Pu 1.25 kN. Mounted width B1 59 mm includes the adapter sleeve. Supplied/specified with HE 2311. The catalogue publishes a single speed ceiling, the limiting speed: 3,600 r/min; mass 1200 g. Selection figures for YSA 211-2FK HE 2311: C0/C is 0.665, Pu 1.25 kN is 2.867 % of the 43.6 kN dynamic rating, and the 1200 g catalogue mass works out to roughly 23.622 g per millimetre of the 50.8 mm bore. At the printed limiting speed of 3,600 r/min the mean diameter dm = 75.4 mm implies dn about 2.71x10^5 mm.r/min — the speed-demand figure used when comparing this insert with open deep-groove sizes of the same bore. Capacity density: 43.6 kN from 1.200 kg of bearing steel is about 36.333 kN per kilogram, and per width millimetre the 40 mm unit carries 1.09 kN of dynamic capacity. Static-first planning: the 0.725 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 50.8 mm shaft, not the 43.6 kN L10 value. Grease-life arithmetic is dominated by speed: at dn approx 2.71x10^5 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-211-2FK-HE-2311: HE 2311 pulls the tapered inner ring onto the 50.8 mm plain shaft; the printed s1 32.5 mm is the pre-drive distance and 59 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.
• The order number is incomplete without the sleeve: YSA-211-2FK-HE-2311 specifies the HE 2311 adapter as part of the article; quoting only the YSA bearing risks delivery of a sleeve-less tapered bore that cannot mount.
• Sleeve drive-up uses the printed s1 32.5 mm starting distance, not a torque value guessed from locknut size; re-measure the residual gap after tightening rather than trusting feel.
• Ordering discipline for the 50.8 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.