YAT-203-010 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 YAT-203-010 model number is decoded

YAT 203-010 is SKF's 15.875 mm-bore grub-screw insert bearing with the inner ring extended on one side 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 15.875x40x22.1 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 YAT 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 is extended on one side only. the three-digit -010 tail codes the bore in inches for inch-shaft bearings: 0 whole inch 10/16 in = 15.875 mm (first digit whole inches, next two sixteenths of an inch). this suffix-free execution is listed without the sealed external design: the 22.1 mm width is the one-side-extended inner ring alone, so protection depends on the housing seals and the relubrication routine rather than bearing-mounted contact seals. Envelope 15.875x40x22.1 mm (0.625x1.575x0.87 in), outer ring 12 mm wide, C 9.56 kN, C0 4.75 kN, Pu 0.2 kN. The catalogue publishes a single speed ceiling, the limiting speed: 9,500 r/min; mass 90 g. Pitch-diameter arithmetic: dm = (15.875+40)/2 = 27.938 mm; at the 9,500 r/min limiting speed the ball set runs at dn approx 2.65x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. Spherical-seat note in numbers: the 40 mm OD is ground spherical, so the self-aligning pivot happens on a circle roughly pi x 27.938 = 87.77 mm in mean circumference — keep that interface greased, because corrosion locking turns the pivot into a fixed misaligned mount. Fatigue-limit check: Pu 0.2 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YAT 203-010 — most belt-driven mounted-unit loads sit comfortably under 2.092 % of C. Bore-to-OD planning: OD 40 over bore 15.875 is a 2.52x step, while bore/overall-width gives 0.718; the spherical seat in the matching Y-housing must be specified to the 40 mm OD, not to a cylindrical housing bore. Speed ceiling of 9,500 r/min is the catalogue mechanical limit for THIS execution; seal lip and flinger drag, not steel fatigue, are normally what cap it, so real fan duty is planned well below it. Single-extension fitting note: with the inner ring extended only on the locking side, orient the open (non-extended) face toward the shaft step or housing shoulder as the drawing shows — reversed, the set screws end up unsupported by the abutment and the shortened side offers no seal land at all. Set-screw geometry on this size: the two 120 deg screws bear on the 15.875 mm shaft inside the 22.1 mm total width while the outer ring is only 12 mm wide, leaving the extended ring to carry the screw points clear of the ball track.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Replacement discipline: a one-side YAT 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.
• The 15.9 mm s1 dimension is the screw seating geometry inside the 10.1 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Do not specify the 15.875 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.
• Ordering discipline for the 15.875 mm size: the chapter lists several executions side by side (YAR2 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.