YAR-212-204-2F 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-212-204-2F model number is decoded

YAR 212-204-2F is SKF's 57.15 mm-bore grub-screw insert bearing with the inner ring extended on both sides in the YAR2 series — a Y-bearing with a spherically ground outside surface for static self-alignment inside a matching SKF Y-housing, boundary dimensions 57.15x110x65.1 mm. Wide-inner-ring deep-groove ball geometry carries the load: the extended inner ring gives the shaft grip and the seal lands, while the outer ring stays narrow and spherically ground on its outside surface. the YAR prefix names SKF grub-screw Y-bearings: two set screws in the extended inner ring lock the shaft at a 120 deg angle, and the inner ring extends symmetrically on both sides. the three-digit -204 tail codes the bore in inches for inch-shaft bearings: 2 whole inch 4/16 in = 57.15 mm (first digit whole inches, next two sixteenths of an inch). suffix -2F means an NBR rubber contact seal plus a plain pressed-steel flinger on EACH side: the lip rides the extended inner ring while the flinger sheds coarse contamination before it reaches the lip. Envelope 57.15x110x65.1 mm (2.25x4.331x2.563 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 1550 g. 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). Envelope arithmetic: the radial section from 57.15 mm bore to 110 mm OD is 26.425 mm; dividing C 52.7 kN by that section gives 1.994 kN per section millimetre, and the 65.1 mm overall width is 2.464x the section. Fillet discipline: the printed r_min 1.5 mm limit means shaft and housing fillets must stay under that radius; a fillet that bottoms the 57.15x110 mm insert on its chamfer tilts the whole spherical seat. Static-first planning: the 0.553 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 57.15 mm shaft, not the 52.7 kN L10 value. Pitch-diameter arithmetic: dm = (57.15+110)/2 = 83.575 mm; at the 3,400 r/min limiting speed the ball set runs at dn approx 2.84x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. 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-212-204-2F: 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 26.425 mm radial section.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not specify the 57.15 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 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.
• 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 212-204-2F as the grub two f execution; other order numbers of the YAR 212-204 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.