YARAG-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 YARAG-208-108 model number is decoded

YARAG 208-108 is SKF's 38.099999999999994 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 38.099999999999994x80x49.2 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 -108 tail codes the bore in inches for inch-shaft bearings: 1 whole inch 8/16 in = 38.1 mm (first digit whole inches, next two sixteenths of an inch). AG marks the agricultural-machinery application execution, built on the sealed both-sides-extended geometry and tuned for the low-speed, shock-laden duty of harvesters, balers and spreaders — note the catalogue prints a much reduced limiting speed for this variant. Envelope 38.099999999999994x80x49.2 mm (1.5x3.15x1.937 in), outer ring 21 mm wide, C 30.7 kN, C0 19 kN, Pu 0.8 kN. The catalogue publishes a single speed ceiling, the limiting speed: 950 r/min; mass 630 g. Spherical-seat note in numbers: the 80 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 59.05 = 185.511 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Capacity density: 30.7 kN from 0.630 kg of bearing steel is about 48.73 kN per kilogram, and per width millimetre the 49.2 mm unit carries 0.624 kN of dynamic capacity. Imperial procurement cross-check: 1.5 in bore, 3.15 in OD, 1.937 in overall width; the 630 g mass converts to 0.630 kg (22.2 oz) for the bill of materials. Mass-to-load ratio for YARAG-208-108: 20.521 g of catalogue mass per rated kN of C, and 16.535 g per millimetre of bore — useful when comparing executions of the same 38.099999999999994x80 mm envelope on the drawing. Grease-life arithmetic is dominated by speed: at dn approx 0.56x10^5 the sealed-for-life fill is planned for the catalogue's grease-life regime, which is why the AG variant caps speed so aggressively, and high-temperature mounts shorten both even when load is light. Service tip for YARAG-208-108: 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 20.95 mm radial section.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Do not specify the 38.099999999999994 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 30.2 mm s1 dimension is the screw seating geometry inside the 28.2 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 YARAG 208-108 as the grub two ag execution; other order numbers of the YARAG 208-108 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.