YAR-207-104-2RF 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-207-104-2RF model number is decoded

Listed in SKF 17000 chapter 2, YAR 207-104-2RF is a grub-screw insert bearing with the inner ring extended on both sides, 31.75x72x42.9 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. for inch shafts the order number carries the bore as whole-inches plus sixteenths: -104 = 31.75 mm, which is why this row sits beside, not on, the metric bore size. 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 31.75x72x42.9 mm (1.25x2.835x1.689 in), outer ring 19 mm wide, C 25.5 kN, C0 15.3 kN, Pu 0.655 kN. The catalogue publishes a single speed ceiling, the limiting speed: 3,200 r/min; mass 510 g. Inner-geometry cross-reference: the catalogue shoulder diameters (d1 46.1 mm) set the shaft-abutment and sleeve limits; an abutment larger than these numbers contacts the seal or the rubberized flinger. Spherical-seat note in numbers: the 72 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 51.875 = 162.97 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Envelope arithmetic: the radial section from 31.75 mm bore to 72 mm OD is 20.125 mm; dividing C 25.5 kN by that section gives 1.267 kN per section millimetre, and the 42.9 mm overall width is 2.132x the section. Outer-vs-overall width: the outer ring is 19 mm wide inside the 42.9 mm total, so the extended inner ring accounts for 0.557 of the overall width (11.95 mm of axial projection per side). The s1 25.4 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. 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 31.75 mm shaft inside the 42.9 mm total width while the outer ring is only 19 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 31.75 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 25.4 mm s1 dimension is the screw seating geometry inside the 23.9 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 207-104-2RF as the grub two rf execution; other order numbers of the YAR 207-104 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.