YET-204 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 YET-204 model number is decoded

The YEL2 series order number YET 204 is a SKF insert bearing (Y-bearing) for a 20 mm shaft: eccentric-locking-collar insert bearing with a one-side-extended inner ring, built to the ISO 15 diameter-series envelope with a sphered OD of 47 mm. Inside sits a sealed ball insert with an eccentric collar on the extended ring: collar bite locks the shaft, the contact seals retain the life grease, and the spherical OD floats in the Y-housing. YET means collar locking instead of grub screws — fit the eccentric collar, turn it in the rotation direction until it grips, then lock the collar's own setscrew; the inner ring is extended on one side. the size code 204 carries the usual bore arithmetic — 20 mm — while the leading 2 marks the ISO 15 diameter series 2 sphered-OD envelope. with no -2F/-2RF suffix the order number denotes the open external execution of the YEL2 size — add external exclusion at the housing and plan relubrication intervals for dusty or wet surroundings. Envelope 20x47x21 mm (0.787x1.85x0.827 in), outer ring 14 mm wide, C 12.7 kN, C0 6.55 kN, Pu 0.28 kN. Mounted width B1 30.5 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 8,500 r/min; mass 160 g. Bore-to-OD planning: OD 47 over bore 20 is a 2.35x step, while bore/overall-width gives 0.952; the spherical seat in the matching Y-housing must be specified to the 47 mm OD, not to a cylindrical housing bore. Pitch-diameter arithmetic: dm = (20+47)/2 = 33.5 mm; at the 8,500 r/min limiting speed the ball set runs at dn approx 2.85x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. Outer-vs-overall width: the outer ring is 14 mm wide inside the 21 mm total, so the extended inner ring accounts for 0.333 of the overall width (7 mm of axial projection on the locking side). Envelope arithmetic: the radial section from 20 mm bore to 47 mm OD is 13.5 mm; dividing C 12.7 kN by that section gives 0.941 kN per section millimetre, and the 21 mm overall width is 1.556x the section. Imperial procurement cross-check: 0.787 in bore, 1.85 in OD, 0.827 in overall width; the 160 g mass converts to 0.160 kg (5.6 oz) for the bill of materials. One-side collar note: the eccentric collar mounts on the extended side only and must turn in the shaft rotation direction to self-tighten; on reversing drives this design can loosen by design intent — choose grub-screw or ConCentra locking for true bidirectional shafts. Collar geometry for this size: over the 14 mm outer-ring width the inner ring runs to 21 mm overall (30.5 mm including the eccentric collar width), giving the collar its eccentric seating face clear of the seal.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The eccentric collar is handed to running direction; fit it wrong on the 20 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 30.5 mm includes collar space — a housing sized for a grub-screw insert of the same OD can be too narrow axially for the YET collar.
• Catalogue ratings belong to YET 204 as the ecc one open execution; other order numbers of the YET 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.