YAT-204-012 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-204-012 model number is decoded

Listed in SKF 17000 chapter 2, YAT 204-012 is a grub-screw insert bearing with the inner ring extended on one side, 19.049999999999997x47x25.5 mm overall, whose convex spherical outer ring pivots in the spherical bore of a Y-pillow, Y-flange or take-up housing. Construction follows the Y-bearing principle: a capped and flinger-protected deep-groove ball insert, inner ring elongated for the screw points, outer ring convex-spherical for the housing seat. YAT is SKF's grub-screw insert design — a single extended inner-ring side housing the two 120 deg set screws. for inch shafts the order number carries the bore as whole-inches plus sixteenths: -012 = 19.05 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 19.049999999999997x47x25.5 mm (0.75x1.85x1.004 in), outer ring 14 mm wide, C 12.7 kN, C0 6.55 kN, Pu 0.28 kN. The catalogue publishes a single speed ceiling, the limiting speed: 8,500 r/min; mass 140 g. Inner-geometry cross-reference: the catalogue shoulder diameters (d1 28.2 mm) set the shaft-abutment and sleeve limits; an abutment larger than these numbers contacts the seal or the inner flinger. Capacity density: 12.7 kN from 0.140 kg of bearing steel is about 90.714 kN per kilogram, and per width millimetre the 25.5 mm unit carries 0.498 kN of dynamic capacity. Width accounting on this execution: 25.5 mm overall and 14 mm outer-ring width leave the housing designer 11.5 mm of inner-ring projection to accommodate the locking arrangement. The s1 18.3 mm dimension is printed for the locking zone — the set-screw/collar seating reference — and it is verified at mounting, not recoverable from d/D/B alone. Selection figures for YAT 204-012: C0/C is 0.516, Pu 0.28 kN is 2.205 % of the 12.7 kN dynamic rating, and the 140 g catalogue mass works out to roughly 7.349 g per millimetre of the 19.049999999999997 mm bore. 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 19.049999999999997 mm shaft inside the 25.5 mm total width while the outer ring is only 14 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

• Do not specify the 19.049999999999997 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.
• 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 18.3 mm s1 dimension is the screw seating geometry inside the 11.5 mm of extended inner ring; a shaft step that crowds that side prevents the screws reaching the shaft squarely.
• Catalogue ratings belong to YAT 204-012 as the grub one open execution; other order numbers of the YAT 204-012 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.