YET-208-108 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-208-108 model number is decoded

Listed in SKF 17000 chapter 2, YET 208-108 is a eccentric-locking-collar insert bearing with a one-side-extended inner ring, 38.099999999999994x80x29.7 mm overall, whose convex spherical outer ring pivots in the spherical bore of a Y-pillow, Y-flange or take-up housing. Construction pairs capped deep-groove geometry with a one-piece eccentric locking collar and a convex outer ring — quick to mount on plain commercial shafts and tolerant of initial static misalignment. reading YET: an eccentric locking collar does the shaft clamping (popular where shaft tolerance and quick removal matter), inner ring extended on one side. for inch shafts the order number carries the bore as whole-inches plus sixteenths: -108 = 38.1 mm, which is why this row sits beside, not on, the metric bore size. the bare designation means no factory seal package: unlike the -2F executions this bearing relies on enclosure by the Y-housing and its own re-greasing path, which is why it is normally specified inside well-sealed plummer and flange units. Envelope 38.099999999999994x80x29.7 mm (1.5x3.15x1.169 in), outer ring 21 mm wide, C 30.7 kN, C0 19 kN, Pu 0.8 kN. Mounted width B1 43.2 mm includes the eccentric collar. The catalogue publishes a single speed ceiling, the limiting speed: 4,800 r/min; mass 640 g. Selection figures for YET 208-108: C0/C is 0.619, Pu 0.8 kN is 2.606 % of the 30.7 kN dynamic rating, and the 640 g catalogue mass works out to roughly 16.798 g per millimetre of the 38.099999999999994 mm bore. Load balance for documentation: C0 19 kN against C 30.7 kN gives a 0.619 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. Imperial procurement cross-check: 1.5 in bore, 3.15 in OD, 1.169 in overall width; the 640 g mass converts to 0.640 kg (22.6 oz) for the bill of materials. Static-first planning: the 0.64 kN of C0 per overall-width millimetre is the figure for belt tension peaks and rotor imbalance standstill loads on the 38.099999999999994 mm shaft, not the 30.7 kN L10 value. Grease-life arithmetic is dominated by speed: at dn approx 2.83x10^5 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. 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. Direction rule for YET-208-108: the eccentric collar self-tightens in the shaft's running direction, so mark rotation at mounting; the 38.099999999999994 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

• 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.
• The eccentric collar is handed to running direction; fit it wrong on the 38.099999999999994 mm shaft and self-tightening becomes self-loosening. Mark the shaft rotation before stripping any YEL2 collar unit.
• Overall width 43.2 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.
• Ordering discipline for the 38.099999999999994 mm size: the chapter lists several executions side by side (YEL2 locking style x seal package x application variant); a bare-number substitution needs a fresh dimension, speed and rating check rather than a like-for-like assumption.