YAR-209-2RF 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-209-2RF model number is decoded

YAR 209-2RF is SKF's 45 mm-bore grub-screw insert bearing with the inner ring extended on both sides in the YAR2 series — a Y-bearing with a spherically ground outside surface for static self-alignment inside a matching SKF Y-housing, boundary dimensions 45x85x49.2 mm. Wide-inner-ring deep-groove ball geometry carries the load: the extended inner ring gives the shaft grip and the seal lands, while the outer ring stays narrow and spherically ground on its outside surface. the YAR prefix names SKF grub-screw Y-bearings: two set screws in the extended inner ring lock the shaft at a 120 deg angle, and the inner ring extends symmetrically on both sides. the size code 209 carries the usual bore arithmetic — 45 mm (code 09 x 5) — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. suffix -2RF upgrades the -2F package with a RUBBERIZED flinger on each side — the coated thrower closes the radial gap against fine dust and slurry better than the plain steel flinger of -2F. Envelope 45x85x49.2 mm (1.772x3.346x1.937 in), outer ring 22 mm wide, C 33.2 kN, C0 21.6 kN, Pu 0.915 kN. The catalogue publishes a single speed ceiling, the limiting speed: 2,400 r/min; mass 670 g. Mass-to-load ratio for YAR-209-2RF: 20.181 g of catalogue mass per rated kN of C, and 14.889 g per millimetre of bore — useful when comparing executions of the same 45x85 mm envelope on the drawing. Rating split for the maintenance file: dynamic 33.2 kN (L10), static 21.6 kN (s0 shock check), fatigue 0.915 kN (adjusted life) — three separate uses for YAR 209-2RF, none interchangeable with another. Spherical-seat note in numbers: the 85 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 65 = 204.204 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Capacity density: 33.2 kN from 0.670 kg of bearing steel is about 49.552 kN per kilogram, and per width millimetre the 49.2 mm unit carries 0.675 kN of dynamic capacity. Static-first planning: the 0.439 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 45 mm shaft, not the 33.2 kN L10 value. 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-209-2RF: 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 20 mm radial section.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not specify the 45 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 30.2 mm s1 dimension is the screw seating geometry inside the 27.2 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.
• Catalogue ratings belong to YAR 209-2RF as the grub two rf execution; other order numbers of the YAR 209 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.