YAT-215-215 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 YAT-215-215 model number is decoded

The YAR2 series order number YAT 215-215 is a SKF insert bearing (Y-bearing) for a 74.6125 mm (2.938 in) shaft: grub-screw insert bearing with the inner ring extended on one side, built to the ISO 15 diameter-series envelope with a sphered OD of 130 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 YAT basic designation: set-screw shaft locking with the screws spaced 120 deg apart; YAT carries the one-side-extended inner ring. inch bore code -215 decodes as 2" +15/16, i.e. 74.612 mm; the metric coded size YAT 215 shares the same envelope but its bore is the metric value, not this one. with no -2F/-2RF suffix the order number denotes the open external execution of the YAR2 size — add external exclusion at the housing and plan relubrication intervals for dusty or wet surroundings. Envelope 74.6125x130x53.5 mm (2.938x5.118x2.106 in), outer ring 29 mm wide, C 66.3 kN, C0 49 kN, Pu 2.04 kN. The catalogue publishes a single speed ceiling, the limiting speed: 2,600 r/min; mass 1750 g. Bore-to-OD planning: OD 130 over bore 74.6125 is a 1.742x step, while bore/overall-width gives 1.395; the spherical seat in the matching Y-housing must be specified to the 130 mm OD, not to a cylindrical housing bore. Selection figures for YAT 215-215: C0/C is 0.739, Pu 2.04 kN is 3.077 % of the 66.3 kN dynamic rating, and the 1750 g catalogue mass works out to roughly 23.455 g per millimetre of the 74.6125 mm bore. Envelope arithmetic: the radial section from 74.6125 mm bore to 130 mm OD is 27.694 mm; dividing C 66.3 kN by that section gives 2.394 kN per section millimetre, and the 53.5 mm overall width is 1.932x the section. Spherical-seat note in numbers: the 130 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 102.306 = 321.404 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Fatigue-limit check: Pu 2.04 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YAT 215-215 — most belt-driven mounted-unit loads sit comfortably under 3.077 % of C. Single-extension fitting note: with the inner ring extended only on the locking side, orient the open (non-extended) face toward the shaft step or housing shoulder as the drawing shows — reversed, the set screws end up unsupported by the abutment and the shortened side offers no seal land at all. Set-screw geometry on this size: the two 120 deg screws bear on the 74.6125 mm shaft inside the 53.5 mm total width while the outer ring is only 29 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

• The 39 mm s1 dimension is the screw seating geometry inside the 24.5 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Do not specify the 74.6125 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 one-side YAT 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 66.3/49 kN figures belong specifically to YAT 215-215; 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.