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 · Drawing review
Drawing review and documented scope
- Hole diameter, countersink angle and screw-head recess reviewed on the drawing
- Fastener material and finished permeability specified for the application
- Coating coverage, clamping load and magnetization reviewed together
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
Drawing dimensions and tolerances
| Parameter | Specification |
|---|---|
| Typical dimensions | Magnet size, hole and countersink specified on the drawing |
| Tolerances | Hole position, countersink and face dimensions agreed per drawing |
Tighter spec?
Send your drawing with the critical surfaces called out. We will confirm the dimensions, production route and inspection requirements for your part.
05 · Grade references
Grade references for Countersunk
N35
80°C classN35 reference: 33–36 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N38
80°C classN38 reference: 36–39 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N42
80°C classN42 reference: 40–43 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N45
80°C classN45 reference: 43–46 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
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
NdFeB design considerations for medical equipment mechanisms, sensors and permanent-magnet MRI systems.
Frequently Asked Questions
Can the screw head be recessed below the magnet surface?
+
A drawing can specify a flush or recessed head. Confirm remaining magnet thickness, countersink geometry and fastener load; brittle NdFeB can crack under excessive clamping force.
Are screws magnetized by the magnet?
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Ferromagnetic steel fasteners can become magnetized and change the local field. Austenitic stainless steel can acquire magnetic response through composition and processing, including cold work. Where low magnetic response matters, specify and verify the finished fastener’s permeability rather than relying on the 316 label alone.
Next step
Request a Quote for Countersunk Magnets
Share dimensions, quantity, grade target and operating conditions. We respond within 1 business day. The production route and acceptance requirements are confirmed during drawing review.