YET-203-008 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-203-008 model number is decoded

The YEL2 series order number YET 203-008 is a SKF insert bearing (Y-bearing) for a 12.7 mm (0.5 in) 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 40 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. inch bore code -008 decodes as 0" +8/16, i.e. 12.7 mm; the metric coded size YET 203 shares the same envelope but its bore is the metric value, not this one. 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 12.7x40x19.1 mm (0.5x1.575x0.752 in), outer ring 12 mm wide, C 9.56 kN, C0 4.75 kN, Pu 0.2 kN. Mounted width B1 28.6 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 9,500 r/min; mass 130 g. Mass-to-load ratio for YET-203-008: 13.598 g of catalogue mass per rated kN of C, and 10.236 g per millimetre of bore — useful when comparing executions of the same 12.7x40 mm envelope on the drawing. Width accounting: B1 28.6 mm covers the bearing WITH its eccentric locking collar against 19.1 mm for the bearing itself and 12 mm outer-ring width; housing axial space is drawn to B1, seal replacement space to B. Envelope arithmetic: the radial section from 12.7 mm bore to 40 mm OD is 13.65 mm; dividing C 9.56 kN by that section gives 0.7 kN per section millimetre, and the 19.1 mm overall width is 1.399x the section. Load balance for documentation: C0 4.75 kN against C 9.56 kN gives a 0.497 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. Rating split for the maintenance file: dynamic 9.56 kN (L10), static 4.75 kN (s0 shock check), fatigue 0.2 kN (adjusted life) — three separate uses for YET 203-008, none interchangeable with another. 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 12 mm outer-ring width the inner ring runs to 19.1 mm overall (28.6 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 12.7 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 28.6 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 203-008 as the ecc one open execution; other order numbers of the YET 203-008 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.