25mm x 3mm x Hole 4mm Neodymium Countersunk Magnet – N52 Grade | Ultra-Wide Low-Profile Fastener

Key Features:

• Dimensions: 25mm Outer Diameter × 3mm Thickness × 4mm Inner Hole Diameter
• Countersink Profile: Accommodates standard #4 or M4 flathead wood/machine screws for flush mounting
• Precision Tolerance: ±0.05mm 
• Magnet Grade: N52 
• Pull Force: Approx. 14.4 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 3mm countersunk N52 ring magnets provide an expansive, stable surface footprint for demanding installation environments where traditional adhesives fail. The 1-inch broad outer diameter significantly increases lateral stability, preventing the magnet from shifting or spinning under heavy shear loads. Designed with an integrated 4mm countersunk hole, it allows a flathead screw to sit completely flush with the magnet's surface, facilitating seamless metal-to-magnet contact and maximizing the available 14.8 lbs of holding force.

Handling Advice: DANGER: Wide, thin countersunk magnets require precise handling. Sintered neodymium is inherently brittle like ceramic. Over-tightening mounting screws with power tools will crack or split the magnet across the center hole—always hand-tighten with care. These magnets also possess high snap velocity; never let them free-fly together or strike steel surfaces violently, as they will shatter into sharp fragments.

Warnings and Safety Information:

• Pinch Hazard: Strong enough to cause painful skin pinches or blood blisters. Handle with professional care.
• Fragility Hazard: Do not over-tighten screws. High impact from snapping together WILL fracture the ring profile.
• 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:

• Low-profile hidden latches for commercial cabinetry, display cases, and heavy secret doors
• Mechanical anchoring for large removable wall panels, acoustic partitions, and ceiling signage
• Flush-mounted signage systems and quick-swap retail exhibition presentation frames
• High-vibration workshop tool organization, custom jigs, and removable machine guards
• Heavy-duty 3D-printed enclosure mounts requiring wide-area structural attachment