YAR-218-2F 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-218-2F model number is decoded

The YAR2 series order number YAR 218-2F is a SKF insert bearing (Y-bearing) for a 90 mm 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 160 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. the size code 218 carries the usual bore arithmetic — 90 mm (code 18 x 5) — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. the -2F external design pairs a nitrile contact seal with a plain sheet-steel thrower on both sides — a two-stage exclusion chain of flinger first, sealing lip second, typical of farm and conveyor duty. Envelope 90x160x89 mm (3.543x6.299x3.504 in), outer ring 36 mm wide, C 95.6 kN, C0 72 kN, Pu 2.7 kN. The catalogue publishes a single speed ceiling, the limiting speed: 2,000 r/min; mass 4000 g. Load balance for documentation: C0 72 kN against C 95.6 kN gives a 0.753 ratio; mounted-unit positions with shock and standstill loading are normally checked on C0, while conveyor and fan duty are evaluated on the L10 figure. Width accounting on this execution: 89 mm overall and 36 mm outer-ring width leave the housing designer 53 mm of inner-ring projection to accommodate the locking arrangement. Imperial procurement cross-check: 3.543 in bore, 6.299 in OD, 3.504 in overall width; the 4000 g mass converts to 4.000 kg (141.1 oz) for the bill of materials. Envelope arithmetic: the radial section from 90 mm bore to 160 mm OD is 35 mm; dividing C 95.6 kN by that section gives 2.731 kN per section millimetre, and the 89 mm overall width is 2.543x the section. Inner-geometry cross-reference: the catalogue shoulder diameters (d1 112 mm) set the shaft-abutment and sleeve limits; an abutment larger than these numbers contacts the seal or the plain flinger. Both-sides sealed order-number note: the two set screws clamp through dimpled recesses in the extended inner ring; tighten alternately to the catalogue procedure and retighten after the first run-in period, because the -2F flingers keep dust out but cannot compensate for a screw that walked loose. Service tip for YAR-218-2F: 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 35 mm radial section.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The 54 mm s1 dimension is the screw seating geometry inside the 53 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.
• Do not specify the 90 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 95.6/72 kN figures belong specifically to YAR 218-2F; 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.