01 — Overview
About Countersunk Magnets
Countersunk magnets incorporate a mounting hole with a tapered countersink, allowing flush screw attachment directly to a ferromagnetic or non-ferromagnetic substrate. The configuration is widely used in mechanical fixtures, door closures, enclosure latches, tool holding systems, and industrial equipment where magnets must be securely retained by mechanical fasteners in addition to their magnetic attachment.
02 — Production Capability
What we can hold
- OD range: 8mm to 80mm
- Standard countersink angles: 82° (US standard) and 90° (ISO standard)
- M3, M4, M5, M6, and custom screw sizes
- Nickel-plated steel screw hardware included if requested
- Magnetization and screw-head placement customized to application
03 — Typical Use Cases
Where Countersunk magnets go to work
Door and enclosure closures
Tool holding and fixture systems
Cable management
Demountable equipment assemblies
Safety equipment mounting
04 — Dimensions & Tolerances
Typical Dimensions & Tolerances
| Parameter | Specification |
|---|---|
| Typical dimensions | OD 8–80mm, thickness 3–15mm, countersink matched to screw size |
| Tolerances | OD ±0.1mm, hole position ±0.1mm |
Tighter spec?
These are typical production ranges. Send your drawing with the critical surfaces called out and we will confirm what we can hold against your tolerance stack-up.
05 — Recommended Grades
Recommended Grades for Countersunk
N35
80°CEntry-level sintered NdFeB grade for cost-sensitive permanent-magnet applications at or below 80°C.
N38
80°CCost-efficient mid-range sintered NdFeB for general permanent-magnet assemblies up to 80°C.
N42
80°CHigh-performance sintered NdFeB grade widely used in compact motors, generators, and precision actuators.
N45
80°CHigher-flux sintered NdFeB grade suited to compact, high-torque designs where temperature is controlled.
06 — Related Applications
Related Applications
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Medical Devices
Precision NdFeB magnets for MRI equipment, surgical robotics, implantable devices, dental applications, and medical sensors, with the biocompatibility and traceability medical programs require.
Frequently Asked Questions
Can the screw head be recessed below the magnet surface?
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Yes — countersink depth is specified to place the screw head either flush with or recessed below the magnet's working face. For applications where the magnet surface must contact the mating surface directly (no screw-head interference), the countersink is cut deep enough to fully recess the screw head.
Are the screws magnetized along with the magnet?
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The screws provided with countersunk magnets are typically zinc or nickel-plated steel, and they become magnetized through contact with the magnet. This is normal and does not affect function. If your application requires non-magnetic fasteners, we can ship stainless steel (austenitic 316) or brass screws that remain non-magnetic when in contact with NdFeB.
Next step
Request a Quote for Countersunk Magnets
Share dimensions, quantity, grade, and target application. Our engineering team responds within 1 business day with a grade recommendation, followed by pricing and lead time within 2 business days.