N35 Countersunk Rare Earth Magnets

This N35 countersunk rare earth magnet is a sintered NdFeB disc magnet with a precision countersunk hole designed for mechanical fastening. The recessed hole accommodates flat‑head screws or bolts, facilitating secure attachment to steel or non‑magnetic surfaces without welding or adhesives. Its geometry supports fixed mounting where a flush surface and consistent magnetic performance are required.

Unlike plain disc magnets, the countersunk variant simplifies installation in industrial fixtures, tooling jigs, cabinets, or equipment housings where alignment and repeatability matter.

• Material: Sintered NdFeB (Neodymium‑Iron‑Boron)
• Grade: N35 - balanced magnetic energy and manufacturability
• Shape: Disc with integrated countersunk hole
• Common Sizes: Multiple diameters and thicknesses available (refer to specification table)
• Mounting Feature: Countersunk hole matched to flat‑head fasteners
• Surface Coating: Ni–Cu–Ni (nickel‑copper‑nickel) standard; alternative coatings (epoxy, zinc) by request
• Operating Conditions: Typical working temperatures up to ~80 °C; high temp grades on request

The countersunk hole is produced during fabrication to strict tolerances so that fasteners sit flush with the magnet surface, reducing interference with surrounding components.

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• Secure Mounting: The countersunk hole allows direct mechanical fastening, removing the need for spot welding or adhesive pads, which can be inconsistent under load.
• Compact Force: N35 material delivers reliable holding force for small to medium fixtures where size and weight are constrained.
• Controlled Field: Axial magnetization (standard for these shapes) produces predictable field lines perpendicular to the mounting surface, suitable for clamping or holding applications.
• Installation Ease: Designed for assembly lines and service environments where time and alignment precision are priorities.

Countersunk rare earth magnets are widely adopted across shop floors, production lines, and mechanical systems. Typical use cases include:

• Fixture and jig mounting in machining or inspection stations
• Magnetic catches for doors, panels, covers
• Tool holders and magnetic stops
• Motor housings and assembly fixtures requiring repeatable positioning
• Equipment retaining plates where fasteners must sit flush

This magnet type is beneficial where magnet location needs to be secured without protruding hardware.

We support bulk orders and can customize magnets based on your fastening and performance needs. Common customization options include:

• Countersunk hole size, depth and chamfer specification
• Magnet diameter, thickness, and grade
• Coating type for specific environments (wet, mildly corrosive, high‑abuse)
• Magnetization direction or multi‑pole patterns for advanced field control

For OEM or production projects, provide part drawings or mechanical specifications so we can confirm feasibility and tolerances.

• Choose fasteners compatible with the countersunk profile to avoid distortion.
• Maintain clearances around magnets to prevent unwanted field interference.
• When embedding in assemblies, ensure steel backing plate thickness is sufficient to carry flux without saturation.

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