YAR-211-203-2F 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 YAR-211-203-2F model number is decoded

The YAR2 series order number YAR 211-203-2F is a SKF insert bearing (Y-bearing) for a 55.5625 mm (2.188 in) shaft: grub-screw insert bearing with the inner ring extended on both sides, built to the ISO 15 diameter-series envelope with a sphered OD of 100 mm. Inside is a sealed deep-groove ball set with an extended inner ring, two set screws 120 deg apart doing the shaft locking, and the sphered outer ring providing the unit's static alignment pivot. reading the YAR basic designation: set-screw shaft locking with the screws spaced 120 deg apart; YAR carries the symmetric, both-sides-extended inner ring. inch bore code -203 decodes as 2" +3/16, i.e. 55.563 mm; the metric coded size YAR 211 shares the same envelope but its bore is the metric value, not this one. 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 55.5625x100x55.6 mm (2.188x3.937x2.189 in), outer ring 25 mm wide, C 43.6 kN, C0 29 kN, Pu 1.25 kN. The catalogue publishes a single speed ceiling, the limiting speed: 3,600 r/min; mass 1000 g. Imperial procurement cross-check: 2.188 in bore, 3.937 in OD, 2.189 in overall width; the 1000 g mass converts to 1.000 kg (35.3 oz) for the bill of materials. Pitch-diameter arithmetic: dm = (55.5625+100)/2 = 77.781 mm; at the 3,600 r/min limiting speed the ball set runs at dn approx 2.80x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. Fatigue-limit check: Pu 1.25 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YAR 211-203-2F — most belt-driven mounted-unit loads sit comfortably under 2.867 % of C. Bore-to-OD planning: OD 100 over bore 55.5625 is a 1.8x step, while bore/overall-width gives 0.999; the spherical seat in the matching Y-housing must be specified to the 100 mm OD, not to a cylindrical housing bore. Load balance for documentation: C0 29 kN against C 43.6 kN gives a 0.665 ratio; mounted-unit positions with shock and standstill loading are normally checked on C0, while conveyor and fan duty are evaluated on the L10 figure. Both-sides sealed order-number note: the two set screws clamp through dimpled recesses in the extended inner ring; tighten alternately to the catalogue procedure and retighten after the first run-in period, because the -2F flingers keep dust out but cannot compensate for a screw that walked loose. Set-screw geometry on this size: the two 120 deg screws bear on the 55.5625 mm shaft inside the 55.6 mm total width while the outer ring is only 25 mm wide, leaving the extended ring to carry the screw points clear of the ball track.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The 33.4 mm s1 dimension is the screw seating geometry inside the 30.6 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Replacement discipline: a YAR insert is not interchangeable with an eccentric-collar unit of the same envelope — the shaft may need spot-facing or collar space that does not exist.
• Do not specify the 55.5625 mm grub-screw insert for a shaft harder than about 45 HRC without dimples: the screw points skate on hard surfaces and the unit creeps regardless of tightening torque.
• The 43.6/29 kN figures belong specifically to YAR 211-203-2F; 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.