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

The YSA2 series order number YSA 211-2FK H 2311 is a SKF insert bearing (Y-bearing) for a 50 mm shaft: tapered-bore (1:12) insert bearing supplied on its H 2311 adapter sleeve, built to the ISO 15 diameter-series envelope with a sphered OD of 100 mm. Inside is a sealed, symmetrically extended ball insert with a tapered bore, the adapter sleeve converting a plain commercial shaft into a precision seat without shoulders, screw points or collars. reading YSA: the inner-ring bore is tapered 1:12 and the bearing ships/specifies with its H 2311 adapter sleeve; driving the sleeve home locks the plain shaft without shoulders or screw points. read the 50 mm bore from the H 2311 sleeve designation — the YSA code marks the bearing seat size and the sleeve series is offset by one (sleeve code 311 clamps the 50 mm shaft). the -2F external design pairs a nitrile contact seal with a plain sheet-steel thrower on both sides — a two-stage exclusion chain of flinger first, sealing lip second, typical of farm and conveyor duty. Envelope 50x100x40 mm (1.969x3.937x1.575 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 H 2311. The catalogue publishes a single speed ceiling, the limiting speed: 3,600 r/min; mass 1250 g. 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. Fillet discipline: the printed minimum-fillet limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 50x100 mm insert on its chamfer tilts the whole spherical seat. Fatigue-limit check: Pu 1.25 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YSA 211-2FK H 2311 — most belt-driven mounted-unit loads sit comfortably under 2.867 % of C. Spherical-seat note in numbers: the 100 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 75 = 235.619 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Mass-to-load ratio for YSA-211-2FK-H-2311: 28.67 g of catalogue mass per rated kN of C, and 25 g per millimetre of bore — useful when comparing executions of the same 50x100 mm envelope on the drawing. 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-H-2311: H 2311 pulls the tapered inner ring onto the 50 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

• The order number is incomplete without the sleeve: YSA-211-2FK-H-2311 specifies the H 2311 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 32.5 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 211-2FK H 2311 as the adapter two f execution; other order numbers of the YSA 211-2FK 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.