Precisionthat holds.

Nanomag SmCo pole rings set a new benchmark in mechanical precision. The basis is the extremely uniform magnetic layer: applied to a precisely machined stainless-steel carrier with constant thickness around the entire circumference. This is how we achieve geometric runout deviations of ≤ 25 µm — guaranteed, not merely typical.

The cause is mechanical, not a matter of the sensing principle: the eccentricity of a scale feeds straight into the angular error. On a ring of 25 mm radius, 50 µm of runout already produce 413 arcseconds of error — our ≤ 25 µm leave 206. The relationship holds equally for magnetic, optical, inductive and capacitive systems.

For magnetic scales the runout of the delivered ring is usually not specified: of 23 ring products reviewed, none states a guaranteed value. Where a figure does appear it is a precondition — SIKO ties its ±0.1° to 50 µm of runout that the application has to provide. We guarantee ≤ 25 µm on the delivered ring. That makes runout a known quantity in your error budget instead of an assumption.

The result: higher system accuracy at lower manufacturing cost on your side.

Vibration from −273 °C to +300 °C, years of exposure to aggressive media: brake fluid, oils, coolants, saltwater, alkaline solutions. Our SmCo pole rings stay stable.

All of these properties share one cause: there is no binder. The temperature limit, speed capability, media resistance and long-term stability of an elastomer-bonded ring are properties of its binder — not of the magnetic material. Where there is no binder, that limit disappears.

In direct comparative testing they retain more than 94 % of their field strength and show no change in runout.

Sintered NdFeB or ferrite rings as well as elastomer solutions lose significant performance here or fail mechanically.

Nanomag SmCo pole rings combine exceptional delicacy with uncompromised mechanical stability. Because the magnetically active layer is only 0.1 mm thick, the carrier alone determines the wall thickness: we have manufactured rings with a 3 mm wall at ⌀ 44 mm and a 3 mm ring height; walls down to 2 mm are feasible and smaller diameters on request — with no loss of robustness.

This reduces the required installation space, minimises the moment of inertia and enables higher dynamics with lower energy consumption — all at the highest precision and runout stability. Perfectly suited to drones, lightweight robots, cobots and all high-dynamic applications where every gram counts.