YAR-208-108-2RF 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-208-108-2RF model number is decoded

The YAR2 series order number YAR 208-108-2RF is a SKF insert bearing (Y-bearing) for a 38.099999999999994 mm (1.5 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 80 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 -108 decodes as 1" +8/16, i.e. 38.1 mm; the metric coded size YAR 208 shares the same envelope but its bore is the metric value, not this one. -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 38.099999999999994x80x49.2 mm (1.5x3.15x1.937 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 650 g. Spherical-seat note in numbers: the 80 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 59.05 = 185.511 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Speed ceiling of 2,800 r/min is the catalogue mechanical limit for THIS execution; seal lip and flinger drag, not steel fatigue, are normally what cap it, so real fan duty is planned well below it. Mass-to-load ratio for YAR-208-108-2RF: 21.173 g of catalogue mass per rated kN of C, and 17.06 g per millimetre of bore — useful when comparing executions of the same 38.099999999999994x80 mm envelope on the drawing. Selection figures for YAR 208-108-2RF: C0/C is 0.619, Pu 0.8 kN is 2.606 % of the 30.7 kN dynamic rating, and the 650 g catalogue mass works out to roughly 17.06 g per millimetre of the 38.099999999999994 mm bore. Imperial procurement cross-check: 1.5 in bore, 3.15 in OD, 1.937 in overall width; the 650 g mass converts to 0.650 kg (22.9 oz) for the bill of materials. 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. Set-screw geometry on this size: the two 120 deg screws bear on the 38.099999999999994 mm shaft inside the 49.2 mm total width while the outer ring is only 21 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

• Do not specify the 38.099999999999994 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 30.2 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.
• Catalogue ratings belong to YAR 208-108-2RF as the grub two rf execution; other order numbers of the YAR 208-108 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.