Every quote states the grade, the coating, the magnetization direction and the tolerance we will hold. Here is what that means in numbers.
| Feature | Process | Held to |
|---|---|---|
| Magnet pocket position | Injection molding | ±0.05 mm |
| Assembly overall length | Fixture bonding | ±0.10 mm |
| Pole face to mounting datum | Post-machining | ±0.05 mm |
| Pull force, per lot | 100 % gauge | ±5 % of golden sample |
| Salt spray, finished part | NSS, ASTM B117 | 48 h default, 500 h on request |
| Cosmetic | Visual, 300 mm / 1000 lux | No sink marks on Class A faces |
| Coating | Layers | Salt spray | Choose when… |
|---|---|---|---|
| Ni-Cu-Ni | 3 layers, bright | 24–48 h | Default; smooth, conductive, cosmetic |
| Ni-Cu-Ni + epoxy | 4 layers, black | 48–96 h | Humid or outdoor-adjacent use |
| Zinc | 2 layers, matte | 12–24 h | Cost-sensitive dry environments |
| Phosphate | 1 layer | — | Temporary protection before overmolding |
North and south on the two large faces — the default for catches, holders and pot magnets.
For rings and discs mounted on a shaft or around a sensor axis.
Alternating poles at 2–48 pole counts for Hall and AMR sensor targets.
For motor rotors — skew angle specified to your cogging requirement.
Dimensional report, flux report and pull-force check ship with every production lot — against the golden sample agreed at approval, not against a catalogue promise.
Tighter tolerances are possible with grinding, priced per face — we will tell you which faces actually need it.