12mm x 3mm x Hole 3mm Neodymium Countersunk Magnet – N52 Grade 

Key Features:

• Dimensions: 12mm Outer Diameter × 3mm Thickness × 3mm Inner Hole Diameter
• Countersink Profile: Accommodates standard #2 or M3 flathead wood/machine screws for flush mounting
• Precision Tolerance: ±0.05mm
• Magnet Grade: N52 
• Pull Force: Approx. 6.5 lbs 
• Coating: Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer plating
• Magnetization: Axially magnetized (Poles on the flat circular faces, countersunk on the North or South face)

Material Description:

Our 12mm x 3mm countersunk N52 ring magnets provide a high-performance, mechanically anchored fastening solution for demanding environments where adhesives might fail. The integrated 3mm countersunk hole allows the magnet to be screwed securely into solid wood, acrylics, or metal framework. Because the flathead screw drops perfectly flush within the recessed pocket, it permits uninterrupted metal-to-magnet surface contact, delivering a crisp, high-strength "snap" with zero clearance gaps.

Handling Advice: DANGER: Countersunk ring profiles require careful installation. Sintered neodymium is brittle and can crack if subjected to excessive stress. Always hand-tighten installation screws with care—over-tightening will split the magnet at its thinnest recessed center point. Due to the high snap velocity of the N52 grade, never allow these rings to smash together or strike steel tools directly.

Warnings and Safety Information:

• Fragility Hazard: Do not over-tighten screws. High impact from snapping together WILL fracture the ring wall.
• Pinch Hazard: Strong enough to cause painful skin pinches or blood blisters. Handle with industrial focus.
• CHOKING HAZARD: Keep securely stored and out of reach of children and pets.
• Medical Safety: KEEP AWAY from pacemakers and sensitive medical implants at all times.

Applications:

• Heavy-duty hidden latches for commercial cabinetry, large wardrobes, and thick secret doors
• Mechanical mounting for heavy removable wall panels, acoustic partitions, and architectural displays
• High-vibration shop-tool organization, jigs, fixtures, and custom workbench hold-downs
• Secure, screw-in fasteners for modular retail displays, signage, and exhibition presentation frames
• Heavy-duty 3D-printed equipment enclosures and removable machine guarding plates