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

Listed in SKF 17000 chapter 2, YSA 211-2FK HA 2311 is a tapered-bore (1:12) insert bearing supplied on its HA 2311 adapter sleeve, 49.212x100x40 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 HA 2311 sleeve converts a plain commercial shaft into a precisely located, demountable seat at 49.212 mm. adapter mounting means the effective bore is the sleeve bore: HA 2311 gives the 49.212 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 49.212x100x40 mm (1.937x3.937x1.575 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 HA 2311. The catalogue publishes a single speed ceiling, the limiting speed: 3,600 r/min; mass 1300 g. Speed ceiling of 3,600 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. At the printed limiting speed of 3,600 r/min the mean diameter dm = 74.606 mm implies dn about 2.69x10^5 mm.r/min — the speed-demand figure used when comparing this insert with open deep-groove sizes of the same bore. The s1 32.5 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. Inner-geometry cross-reference: the catalogue shoulder diameters (d1 69.06 mm, d3 75 mm) set the shaft-abutment and sleeve limits; an abutment larger than these numbers contacts the seal or the plain flinger. Envelope arithmetic: the radial section from 49.212 mm bore to 100 mm OD is 25.394 mm; dividing C 43.6 kN by that section gives 1.717 kN per section millimetre, and the 40 mm overall width is 1.575x the section. 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-HA-2311: HA 2311 pulls the tapered inner ring onto the 49.212 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-HA-2311 specifies the HA 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 49.212 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.