Choosing a shape means choosing which published range will govern the inquiry. Each shape family has its own size table, its own tolerances and its own direction list, and the choice should be made by matching the geometry of the part to the geometry of the shape, not by borrowing a dimension from another shape's table. This guide walks through the six ranges in that spirit, without merging them into a single combined range.
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The six ranges side by side
Disc and cylinder: diameter 1.2–220 mm, height 0.5–50 mm, standard ±0.05 mm and minimum ±0.01 mm, directions axial, diametrical and axial in segments. Block and plate: length 2.0–250 mm, width 1.5–150 mm, thickness 0.5–50 mm, standard ±0.05 mm and minimum ±0.02 mm, directions through length, width and thickness. Ring and tube: outer diameter 3.0–200 mm, inner diameter 1.5–150 mm, height 0.5–50 mm, standard ±0.05 mm and minimum ±0.01 mm, directions axial, diametrical and radial. Arc and segment: outer diameter, inner diameter and angle all customized, standard ±0.05 mm and minimum ±0.02 mm, directions diametrical, through thickness and through circumference, with no product photograph published. Sphere: diameter 1–60 mm, standard ±0.05 mm and minimum ±0.02 mm, directions axial and diametrical. Countersunk: round and rectangular forms customized, hole M1–M10, standard ±0.05 mm and minimum ±0.01 mm, directions axial and through thickness. Custom shapes sit outside all six: no size table is published, and the inquiry supplies the geometry.
Once the shape is chosen, the next step is the grade temperature series, discussed against the shared table, and then the magnetization direction exactly as listed for that shape. Reversing that order — choosing a grade name first and then hunting for a shape — is how a buyer ends up asking for a combination the published range does not list. If the combination is not listed, ask whether it can be made. Please confirm minimum order quantity and lead time before ordering.
When none of the six fits
If no published shape matches the geometry, the custom-shape route is the correct next step, not a forced fit into the nearest shape. A custom inquiry should contain a dimensioned sketch or dimension list, the grade series, the direction described in plain words, the operating temperature and the fixing arrangement. A forced fit — ordering a disc when the part needs a ring's inner diameter, for example — produces a magnet that matches the order and fails the part, which is worse than an extra round of questions.