YAR-204-012-2F 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-204-012-2F model number is decoded

The YAR2 series order number YAR 204-012-2F is a SKF insert bearing (Y-bearing) for a 19.049999999999997 mm (0.75 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 47 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 -012 decodes as 0" +12/16, i.e. 19.05 mm; the metric coded size YAR 204 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 19.049999999999997x47x31 mm (0.75x1.85x1.22 in), outer ring 14 mm wide, C 12.7 kN, C0 6.55 kN, Pu 0.28 kN. The catalogue publishes a single speed ceiling, the limiting speed: 8,500 r/min; mass 160 g. Width accounting on this execution: 31 mm overall and 14 mm outer-ring width leave the housing designer 17 mm of inner-ring projection to accommodate the locking arrangement. The s1 18.3 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. Static-first planning: the 0.211 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 19.049999999999997 mm shaft, not the 12.7 kN L10 value. Spherical-seat note in numbers: the 47 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 33.025 = 103.751 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Load balance for documentation: C0 6.55 kN against C 12.7 kN gives a 0.516 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. 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-204-012-2F: 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 13.975 mm radial section.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not specify the 19.049999999999997 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 18.3 mm s1 dimension is the screw seating geometry inside the 17 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Catalogue ratings belong to YAR 204-012-2F as the grub two f execution; other order numbers of the YAR 204-012 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.