YAR-212-203-2F 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-212-203-2F model number is decoded

The YAR2 series order number YAR 212-203-2F is a SKF insert bearing (Y-bearing) for a 55.5625 mm (2.188 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 110 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 -203 decodes as 2" +3/16, i.e. 55.563 mm; the metric coded size YAR 212 shares the same envelope but its bore is the metric value, not this one. 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 55.5625x110x65.1 mm (2.188x4.331x2.563 in), outer ring 26 mm wide, C 52.7 kN, C0 36 kN, Pu 1.53 kN. The catalogue publishes a single speed ceiling, the limiting speed: 3,400 r/min; mass 1600 g. Grease-life arithmetic is dominated by speed: at dn approx 2.81x10^5 the sealed-for-life fill is planned for the catalogue's grease-life regime, which is why the limiting speed and the relubrication interval move together, and high-temperature mounts shorten both even when load is light. Outer-vs-overall width: the outer ring is 26 mm wide inside the 65.1 mm total, so the extended inner ring accounts for 0.601 of the overall width (19.55 mm of axial projection per side). Selection figures for YAR 212-203-2F: C0/C is 0.683, Pu 1.53 kN is 2.903 % of the 52.7 kN dynamic rating, and the 1600 g catalogue mass works out to roughly 28.796 g per millimetre of the 55.5625 mm bore. Load balance for documentation: C0 36 kN against C 52.7 kN gives a 0.683 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. Imperial procurement cross-check: 2.188 in bore, 4.331 in OD, 2.563 in overall width; the 1600 g mass converts to 1.600 kg (56.4 oz) for the bill of materials. 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. Set-screw geometry on this size: the two 120 deg screws bear on the 55.5625 mm shaft inside the 65.1 mm total width while the outer ring is only 26 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 55.5625 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 39.7 mm s1 dimension is the screw seating geometry inside the 39.1 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Catalogue ratings belong to YAR 212-203-2F as the grub two f execution; other order numbers of the YAR 212-203 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.