YAR-211-2RF 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-211-2RF model number is decoded

The YAR2 series order number YAR 211-2RF is a SKF insert bearing (Y-bearing) for a 55 mm 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. the size code 211 carries the usual bore arithmetic — 55 mm (code 11 x 5) — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. -2RF means an NBR contact lip plus a rubber-coated flinger at both sides, the catalogue step above -2F for wet, abrasive or washed-down environments. Envelope 55x100x55.6 mm (2.165x3.937x2.189 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: 1,900 r/min; mass 1050 g. Selection figures for YAR 211-2RF: C0/C is 0.665, Pu 1.25 kN is 2.867 % of the 43.6 kN dynamic rating, and the 1050 g catalogue mass works out to roughly 19.091 g per millimetre of the 55 mm bore. Imperial procurement cross-check: 2.165 in bore, 3.937 in OD, 2.189 in overall width; the 1050 g mass converts to 1.050 kg (37.0 oz) for the bill of materials. 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. The s1 33.4 mm dimension is printed for the locking zone — the set-screw/collar seating reference — and it is verified at mounting, not recoverable from d/D/B alone. At the printed limiting speed of 1,900 r/min the mean diameter dm = 77.5 mm implies dn about 1.47x10^5 mm.r/min — the speed-demand figure used when comparing this insert with open deep-groove sizes of the same bore. Rubberized-flinger note: the -2RF coated throwers are vulcanized assemblies — never lever or hammer against the flinger when mounting, and press only on the inner ring when the bearing is fitted loose before the housing cap closes, or the flinger lip folds inward and grinds on the inner ring. Service tip for YAR-211-2RF: dimpled or drilled shaft spots under the screw points are sometimes specified on shock duty, but the standard mounting relies on point indentation alone — never substitute longer screws that reach the 22.5 mm radial section.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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 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 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.
• Ordering discipline for the 55 mm size: the chapter lists several executions side by side (YAR2 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.