FAG 4204-BB-TVH Kugellager (20x47x18)

This FAG bearing measures 20x47x18 mm and weighs 0.155 kg; the specification table carries the supplementary technical details. The deep raceway grooves in both rings, closely matched to the ball radius, are the defining feature of this design: they guide the balls laterally and therefore carry axial force in both directions alongside the radial force.

Both consequences follow from this close conformity: a small contact area that widens into an ellipse under load, with correspondingly low rolling friction, and the ability to transmit axial force in both directions through the groove shoulders. That axial capability is tied to the contact angle which establishes itself under axial load — it therefore depends on the clearance remaining in the mounted state and is not a fixed property of the size.

The bearing is non-separable: both rings and the ball set form one unit, which is why the mounting force must always be applied through whichever ring receives the interference fit, and never through the rolling contact. The open form brings no sealing element of its own; sealing, initial filling and relubrication rest with the design, which in exchange is free to use oil, oil-mist or circulating lubrication and to carry heat away with the lubricant.

Through-hardened standard bearing steel provides hardness, dimensional accuracy and fatigue strength across the usual operating temperature range; whether a position may be run above it is to be taken from the designation and the dimensional stabilisation data. The normal radial clearance is matched to one interference-fitted ring and a moderate temperature difference between inner and outer ring; what governs is always the residual clearance in the mounted, warm running state, not the clearance as delivered.

Because no sealing element isolates the bearing position, the cleanliness and lubricant supply of the surroundings decide the achievable service life in practice more often than material fatigue does. Polyamide cage (glass-fiber reinforced) — Dimensional/form-fit equivalent — verify suffix-level details for critical applications. Matching suffixes are also listed by SKF (TN9, ETN9), NSK (T) and NTN (T2).