Updated June 24, 2026
Run the calculator for cylindrical axially magnetized magnets, including the 1 dia x 2/10 thick nickel plated disc alias. Check whether the on-axis field gives enough sensor margin before you freeze the air gap or RFQ.
Quick sizing tool
Calculates the free-space on-axis field for a cylindrical axial magnet. Adjust dimensions, gap, grade, and sensor type to screen your target distance before fixture testing. Includes the standard 1" dia x 0.2" thick preset.
Decimal or fraction.
Decimal or fraction. (e.g. 0.2 for 2/10)
On-axis distance to the sensor element.
Result
Likely workable
Estimated field
189.0 mT
The estimated field is above the selected sensor target with usable margin. The mT target is a screening baseline. Confirm the selected sensor threshold, field direction, and temperature drift before committing. Note: nickel-plating (Ni-Cu-Ni) typically adds about 10-25 um total coating thickness.
Metric size
25.40 mm x 5.08 mm
Sensor target
10.0 mT screening baseline
A "1 dia x 2/10 thick nickel plated axially magnetized" magnet is a large axial disc preset for end-on sensing. The model gives strong margin for many Hall and reed baselines, but the exact switching distance still depends on the sensor threshold, package offset, steel nearby, and temperature.
Next step
Prototype simple sealed switching with high durability; Reed switch operate and release lobes are part-specific. Test the final fixture.
The north and south poles are located on the flat circular faces. This provides a strong, straightforward field projecting outwards, ideal for sensing along the central axis.
For the default N52 preset, the free-space on-axis model estimates about 61 mT at a 15 mm gap. Treat that as a screening result; sensor thresholds, package offset, nearby steel, and temperature must still be tested.
Standard Ni-Cu-Ni plating is typically about 10-25 micrometers total. That is tiny compared with a millimeter-scale sensor gap, but it is conductive and needs sealing or a coating upgrade in wet or salt environments.
Axial magnets are designed to approach a sensor head-on. If the sensor needs to read a rotating field from the side, diametric magnetization is required instead.
The default N52 model estimates about 189 mT at 5 mm, 61 mT at 15 mm, and 14 mT at 30 mm. Use the calculator to compare those values with the real sensor BOP/BRP or operate/release window.
Axial magnetization is the most common form for a cylinder magnet. The magnetic poles are situated on the large flat faces, creating a uniform, strong field extending outward.
| Magnetization | Best for | Trade-off |
|---|---|---|
| Axial cylinder magnet | End-on proximity, reed switch actuation, push-button mechanisms, high-gap sensing | Not suitable for rotary angle encoding from the side |
| Diametric cylinder magnet | Rotary angle index, side-mounted Hall sensing | Orientation must be controlled during assembly; lower throw distance |
| Ring magnet, axial | Shaft-through linear sensing, speakers, magnetic levitation | Requires center tooling; slightly weaker than a solid cylinder |
The query "1 dia x 2 10 thick nickel plated axially magnetized" is a common manufacturing descriptor. It corresponds to a 1 inch diameter, 0.2 inch thick cylinder. Ni-Cu-Ni plating is the default for neodymium, providing essential corrosion protection without degrading the sensor-triggering field strength.
Uses the cylinder on-axis equation with representative Br by grade. The default 1" x 0.2" N52 preset estimates about 189 mT at 5 mm, 61 mT at 15 mm, and 14 mT at 30 mm.
Uses representative Br values by grade; our material guide lists NdFeB remanence across about 11.5-14.8 kGs, with N52 near the upper end of common grades.
Uses a 10-25 um total Ni-Cu-Ni thickness range and treats the coating as a dimensional and corrosion-control detail, not as a magnetic shield at sensor-scale gaps.
The final procurement path should include magnetization direction, pole reference, air gap, sensor family, operating temperature, coating, and acceptance method.
| Air gap | Model estimate | Decision use |
|---|---|---|
| 0 mm | 274.8 mT | Check sensor saturation. |
| 5 mm | 189.0 mT | Usually large margin. |
| 15 mm | 60.6 mT | Verify BOP/BRP and offset. |
| 30 mm | 14.4 mT | Prototype before release. |
Standard N-grade neodymium is commonly treated as an 80°C class material. Above the rated temperature, especially with opposing fields, irreversible loss can occur.
The 1" diameter provides a large surface area, but at 0.2" thick, the Ni-Cu-Ni plated edges are brittle and prone to chipping upon high-impact attraction.
Mounting the magnet directly inside a steel cup or near ferrous metal will shunt the magnetic field, significantly reducing the throw distance.
Next decision
A 1 inch by 0.2 inch nickel plated axial disc can be a strong starting point, but the purchase-ready requirement is the field at the sensor element, operating temperature, coating exposure, and acceptance test. Use these adjacent resources to close the missing drawing details.
Prepare an RFQ packageThis refers to a cylinder magnet with a 1 inch diameter and a 0.2 inch (2/10") thickness. It is plated with nickel (Ni-Cu-Ni) for corrosion resistance, and its north and south poles are located on the flat circular faces (axially magnetized).
No. The standard Ni-Cu-Ni plating is extremely thin (typically 15 to 25 micrometers). While nickel is ferromagnetic, this microscopic layer is fully saturated by the neodymium core and does not reduce the effective macroscopic field strength at the sensor.
Axial magnets are preferred when the sensor faces the flat end of the magnet (end-on sensing) or for simple push/pull and reed switch applications. Diametric is only needed when the sensor reads from the curved side to detect rotation.
Often yes, if the reed capsule faces the pole on-axis and the operating temperature is within the magnet grade. The default N52 model estimates about 61 mT at 15 mm, but reed operate and release windows are part-specific, so validate the final fixture before freezing the distance.
You can use a known magnet, a compass, or a gaussmeter. The flat faces will strongly attract or repel. The poles are on the large circular faces, not the curved edges.
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