8mm x 3mm x Hole 3mm Neodymium Countersunk Magnet – N52 Grade | Precision Micro Screw-Mount Fastener

Key Features:

• Dimensions: 8mm Outer Diameter × 3mm Thickness × 3mm Inner Hole Diameter (7.94mm × 3.18mm × 3.18mm)
• Countersink Profile: Accommodates standard M3 or #2 flathead screws for perfectly flush mounting
• Precision Tolerance: ±0.05mm 
• Magnet Grade: N52
• Pull Force: Approx. 3.4 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 8mm x 3mm countersunk N52 ring magnets provide a high-performance, mechanically anchored fastening solution for compact engineering, custom cabinetry, and precision fabrication projects where adhesives fail. The 3mm thickness provides ample magnetic volume, allowing the flux field to project through thin non-magnetic barriers like plastics, veneers, or leather. Featuring an integrated 3mm countersunk opening, it permits standard flathead mounting screws to sit completely flush with the magnet's face. This ensures seamless magnet-to-metal contact, maximizing the available 3.2 lbs of holding force with zero clearance gaps.

Handling Advice: CRITICAL NOTICE: High-performance countersunk rings require careful handling. Sintered neodymium is inherently brittle like ceramic. Over-tightening mounting screws with manual or power drivers can exert too much outward force and instantly split the magnet across its recessed center hole—always hand-tighten with care. These magnets also have a high snap velocity; never allow them to slam together or strike steel tools freely, as they will fracture upon impact.

Warnings and Safety Information:

• Fragility Hazard: Highly brittle. Do not over-tighten screws. High impact from snapping together WILL shatter the ring wall.
• Pinch Hazard: Strong enough to cause sharp skin pinches or small blood blisters if handled carelessly in groups.
• CHOKING HAZARD: Small profile is a severe danger to children and pets. Keep strictly secured.
• Medical Safety: KEEP AWAY from pacemakers and sensitive medical implants at all times.

Applications:

• Concealed magnetic catches for premium custom cabinetry, cigar boxes, and luxury presentation cases
• Mechanical anchoring for swappable component systems and heavy weapons rigs in high-end scale miniatures
• Flush-mounted removable panels and high-strength access doors for low-clearance 3D-printed enclosures
• Discreet, screw-in fasteners for high-end leathercraft, removable straps, and tactical gear mockups
• Deep-reach proximity sensor targets and mechanical alignment blocks for small-scale robotics and automation