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

YEL 204-012-2F is SKF's 19.049999999999997 mm-bore eccentric-locking-collar insert bearing with the inner ring extended on both sides in the YEL2 series — a Y-bearing with a spherically ground outside surface for static self-alignment inside a matching SKF Y-housing, boundary dimensions 19.049999999999997x47x34.2 mm. The deep-groove ball set is built into an extended inner ring carrying a separate eccentric locking collar; turning the collar against its eccentric seat pinches the shaft, and the sphered outer ring self-aligns in the housing. the YEL prefix identifies the eccentric-locking-collar design: a separate eccentric collar turns against a matching eccentric on the extended inner ring to pinch the shaft, extended both sides. the three-digit -012 tail codes the bore in inches for inch-shaft bearings: 0 whole inch 12/16 in = 19.05 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 19.049999999999997x47x34.2 mm (0.75x1.85x1.346 in), outer ring 14 mm wide, C 12.7 kN, C0 6.55 kN, Pu 0.28 kN. Mounted width B1 43.7 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 8,500 r/min; mass 210 g. Static-first planning: the 0.192 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. 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. Pitch-diameter arithmetic: dm = (19.049999999999997+47)/2 = 33.025 mm; at the 8,500 r/min limiting speed the ball set runs at dn approx 2.81x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. Bore-to-OD planning: OD 47 over bore 19.049999999999997 is a 2.467x step, while bore/overall-width gives 0.557; the spherical seat in the matching Y-housing must be specified to the 47 mm OD, not to a cylindrical housing bore. Selection figures for YEL 204-012-2F: C0/C is 0.516, Pu 0.28 kN is 2.205 % of the 12.7 kN dynamic rating, and the 210 g catalogue mass works out to roughly 11.024 g per millimetre of the 19.049999999999997 mm bore. Two-side sealed collar note: after driving the eccentric collar tight, lock the collar set screw against its recess and verify the collar cannot be turned by hand; a collar that was merely pressed on without the eccentric bite spins on the shaft and frets it within hours. Direction rule for YEL-204-012-2F: the eccentric collar self-tightens in the shaft's running direction, so mark rotation at mounting; the 19.049999999999997 mm shaft must be free of burrs under the collar or the eccentric cannot bed flat.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The eccentric collar is handed to running direction; fit it wrong on the 19.049999999999997 mm shaft and self-tightening becomes self-loosening. Mark the shaft rotation before stripping any YEL2 collar unit.
• Never pin or weld the eccentric collar: the controlled eccentric friction is the locking principle, and pinning turns a demountable insert into a shaft-replacement job.
• Overall width 43.7 mm includes collar space — a housing sized for a grub-screw insert of the same OD can be too narrow axially for the YEL collar.
• Catalogue ratings belong to YEL 204-012-2F as the ecc two f execution; other order numbers of the YEL 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.