10mm x 3mm x Hole 3mm Neodymium Straight Ring Magnet – N52 Grade | Precision Uniform Torque Ring

Key Features:

• Dimensions: 10mm Outer Diameter × 3mm Thickness × 3mm Inner Hole Diameter
• Straight Hole Profile: Uniform 3mm cylindrical inner diameter (no countersink) for axle-mounting and pinning
• Precision Tolerance: ±0.05mm 
• Magnet Grade: N52 
• Pull Force: Approx. 5 lbs 
• Coating: Nickel-Copper-Nickel (Ni-Cu-Ni) triple-layer plating for superior durability
• Magnetization: Axially magnetized (Poles on the flat circular faces, providing uniform flux distribution)

Material Description:

Our 10mm x 3mm uniform N52 ring magnets are engineered specifically for precision mechanical, automation, and electronics projects where a non-countersunk through-hole is mandatory. The straight 3mm inner bore allows this magnet to be seamlessly pressed onto small steel shafts, utilized as a magnetic guide sleeve, or held securely via straight machine pins. Because both circular faces remain entirely flat, this ring can be stacked back-to-back to compound magnetic force or arranged in alternating arrays for micro-magnetic couplings and contactless sensory drive systems.

Handling Advice: DANGER: Precision ring profiles require careful installation. Neodymium is inherently brittle like ceramic. Unlike countersunk holes, straight holes distribute mechanical clamping force evenly, but over-tightening bolts or pins can still crack the core—always hand-tighten with care. These magnets also possess high snap velocity; never let them free-fly together or snap onto steel tools, as they will shatter upon impact.

Warnings and Safety Information:

• Fragility Hazard: Highly brittle. High impact from snapping together WILL fracture the cylindrical ring wall.
• Pinch Hazard: Strong enough to cause sharp skin pinches or small blood blisters if handled carelessly.
• CHOKING HAZARD: Small size is dangerous for children and pets. Keep strictly secured.
• Medical Safety: KEEP AWAY from pacemakers and sensitive medical implants at all times.

Applications:

• Precision magnetic couplings, rotary encoders, and contactless drive linkages for micro-automation
• Shaft-mounted rotational assemblies, small magnetic bearings, and guide rollers
• Pass-through sensor rings for miniature pneumatic cylinders and Hall-effect electronics assemblies
• Secure bolt-through anchoring for custom electronic housings, small enclosures, and presentation cases
• Compact workshop tool organization, custom mounting jigs, and removable positioning blocks