YAR-208-2RF 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-208-2RF model number is decoded

Listed in SKF 17000 chapter 2, YAR 208-2RF is a grub-screw insert bearing with the inner ring extended on both sides, 40x80x49.2 mm overall, whose convex spherical outer ring pivots in the spherical bore of a Y-pillow, Y-flange or take-up housing. Construction follows the Y-bearing principle: a capped and flinger-protected deep-groove ball insert, inner ring elongated for the screw points, outer ring convex-spherical for the housing seat. YAR is SKF's grub-screw insert design — an inner ring extended equally past the outer ring on both sides, the screws still 120 deg apart. the size code 208 carries the usual bore arithmetic — 40 mm (code 08 x 5) — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. the -2RF external design combines contact nitrile seals with rubberized additional flingers on both sides for a tighter labyrinth than the plain-flinger -2F execution. Envelope 40x80x49.2 mm (1.575x3.15x1.937 in), outer ring 21 mm wide, C 30.7 kN, C0 19 kN, Pu 0.8 kN. The catalogue publishes a single speed ceiling, the limiting speed: 2,800 r/min; mass 600 g. Width accounting on this execution: 49.2 mm overall and 21 mm outer-ring width leave the housing designer 28.2 mm of inner-ring projection to accommodate the locking arrangement. Mass-to-load ratio for YAR-208-2RF: 19.544 g of catalogue mass per rated kN of C, and 15 g per millimetre of bore — useful when comparing executions of the same 40x80 mm envelope on the drawing. Fillet discipline: the printed r_min 1 mm limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 40x80 mm insert on its chamfer tilts the whole spherical seat. Spherical-seat note in numbers: the 80 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 60 = 188.496 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Pitch-diameter arithmetic: dm = (40+80)/2 = 60 mm; at the 2,800 r/min limiting speed the ball set runs at dn approx 1.68x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. 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-208-2RF: 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

• The 30.2 mm s1 dimension is the screw seating geometry inside the 28.2 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Do not specify the 40 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.
• 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.
• The 30.7/19 kN figures belong specifically to YAR 208-2RF; 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.