25mm x 5mm x Hole 5mm Neodymium Countersunk Magnet – N52 Grade 

Key Features:

• Dimensions: 25mm Outer Diameter × 5mm Thickness × 5mm Inner Hole Diameter
• Countersink Profile: Accommodates standard #6, #8, or M5 flathead wood/machine screws for flush mounting
• Precision Tolerance: ±0.05mm
• Magnet Grade: N52 
• Pull Force: Approx. 27.5 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 25mm x 5mm countersunk N52 ring magnets provide an exceptionally strong, mechanically anchored fastening solution for the most demanding industrial, architectural, and millwork projects. The 5mm depth provides substantial magnetic volume, allowing a deep field to project through non-magnetic finishes or air gaps. Featuring an integrated 5mm countersunk hole, it accommodates heavier-duty M5 or flathead screws. Because the screw head drops perfectly flush within the recessed pocket, it permits uninterrupted metal-to-magnet surface contact, maximizing the available 26.5 lbs of holding force.

Handling Advice: DANGER: Industrial-scale countersunk magnets require careful, controlled installation. Neodymium is inherently brittle like ceramic. Over-tightening installation screws with power tools can cause the magnet to split or crack at its recessed center point—always hand-tighten with care. These magnets also possess immense snap velocity; never let them free-fly together or snap onto steel tools, as they will shatter violently upon impact.

Warnings and Safety Information:

• Severe Crush Hazard: High risk of serious skin and finger pinching or blood blisters. Handle with industrial focus.
• Fragility Hazard: Do not over-tighten screws. High impact from snapping together WILL fracture the ring wall.
• 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 closures for commercial security doors, heavy panels, and custom cabinetry
• Mechanical anchoring for large removable wall partitions, acoustic panels, and massive graphics
• High-vibration workshop tool organization, heavy-duty jigs, fixtures, and custom workbench hold-downs
• Secure, screw-in fasteners for modular retail displays, heavy signage, and exhibition presentation frames
• Heavy-duty 3D-printed equipment enclosures and removable machine guarding plates