YSPAG-207-104 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 YSPAG-207-104 model number is decoded

YSPAG 207-104 is SKF's 31.75 mm-bore SKF ConCentra insert bearing with concentric stepped-sleeve locking and symmetrically extended inner ring in the YSP2 series — a Y-bearing with a spherically ground outside surface for static self-alignment inside a matching SKF Y-housing, boundary dimensions 31.75x72x39.7 mm. The ConCentra principle replaces point or eccentric clamping: a stepped sleeve between shaft and inner ring is driven axially to contract uniformly, concentric with the sphered-OD sealed ball insert. the YSP prefix names SKF ConCentra locking: a stepped (multi-diameter) sleeve between shaft and inner ring is driven axially to grip concentrically, avoiding the local shaft fretting of set screws or the imbalance of an eccentric collar. the three-digit -104 tail codes the bore in inches for inch-shaft bearings: 1 whole inch 4/16 in = 31.75 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 31.75x72x39.7 mm (1.25x2.835x1.563 in), outer ring 19 mm wide, C 25.5 kN, C0 15.3 kN, Pu 0.655 kN. The catalogue publishes a single speed ceiling, the limiting speed: 1,100 r/min; mass 490 g. Load balance for documentation: C0 15.3 kN against C 25.5 kN gives a 0.6 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. Fatigue-limit check: Pu 0.655 kN is the equivalent-load threshold under which the SKF adjusted-rating model credits very long life for YSPAG 207-104 — most belt-driven mounted-unit loads sit comfortably under 2.569 % of C. Mass-to-load ratio for YSPAG-207-104: 19.216 g of catalogue mass per rated kN of C, and 15.433 g per millimetre of bore — useful when comparing executions of the same 31.75x72 mm envelope on the drawing. Pitch-diameter arithmetic: dm = (31.75+72)/2 = 51.875 mm; at the 1,100 r/min limiting speed the ball set runs at dn approx 0.57x10^5, reduced from an open bearing mainly by seal lip friction and the life-long grease fill. Speed ceiling of 1,100 r/min is the catalogue mechanical limit for THIS execution; the AG agricultural derate is deliberate, so real fan duty is planned well below it. Reuse note for YSPAG-207-104: the stepped locking sleeve is a one-time clamping component in most over-torque cases; if the 31.75 mm shaft shows a polished sleeve imprint after withdrawal, fit a new sleeve rather than re-driving the old one.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• ConCentra solves run-out and fretting but not gross misalignment — the housing spherical seat still carries that function; do not use the sleeve grip as an excuse to skip housing alignment.
• The SB shortened-inner-ring ConCentra unit needs its matching mounting sleeve and procedure; substituting a standard YSP sleeve or a generic drift is the usual cause of crooked drive-up on the 31.75 mm shaft.
• Inspect the shaft before sleeve mounting: a single deep keyway burr or old screw-point dimple under the 39.7 mm-wide sleeve causes a local unclamped arc that later frets.
• Ordering discipline for the 31.75 mm size: the chapter lists several executions side by side (YSP2 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.