15mm x 4mm x Hole 4mm N52 Ring Rare Earth Neodymium Magnet 15x4mm H4mm

15mm OD x 4mm ID x 4mm (19/32in OD x 5/32in ID x 5/32in)
Neodymium Ring Magnet – N52 Grade (Pull Force approx. 8.25 lbs).

Key Features:

• Dimensions Metric: 15mm OD × 4mm ID × 4mm thickness
• Dimensions Imperial: 19/32 inch OD × 5/32 inch ID × 5/32 inch thickness
• Magnet to steel pull force: approx. 8.25 lbs
• Magnet Grade: N52
• Coating: Triple-Layer Nickel-Copper-Nickel (Ni-Cu-Ni) - Total: 15 – 25 µm
• Material Composition: Neodymium (Nd), Iron (Fe), and Boron (B) – Nd₂Fe₁₄B formula
• Shape: Ring
• Magnetization Direction: Axial (Through Thickness)
• Surface Magnetic Field (B₀): ~ -3,038 Gauss
• Max Operating Temperature: 80°C (176°F)
• Curie Temperature: 310°C (590°F)
• Residual Induction (Br): 14.3 – 14.8 kGs (1.43 – 1.48 T)
• Max Energy Product ((BH)max): 52.0 MGOe (414 kJ/m³)
• Dimensional Tolerance: ±0.05 mm (±0.002 in)
• Estimated Weight: 4.92 grams (0.174 oz)
• SKU / Part Number: JCN52-RG15-4-H4

Material Description:

Neodymium magnets are made from powerful rare earth metals. These 5/32" thick rings are ultra-low profile, making them perfect for applications where a strong pull is needed without the bulk. They are the strongest commercially available permanent magnets for their size.

Note: Due to their thin profile, these magnets are brittle. Handle with care to prevent them from snapping together and shattering. Always slide magnets apart rather than lifting.

Warnings and Safety Information:

• Keep away from children. Small magnets pose a choking hazard and can cause serious internal injury if swallowed.
• Avoid contact with pacemakers. Magnetic fields can interfere with medical device operation.
• Handle with caution. Magnets may snap together quickly; keep fingers clear and avoid impact.
• Not a toy. Designed for industrial, professional, and hobbyist use only.
• Thermal Sensitivity. Do not heat above 80°C (176°F) to prevent permanent loss of magnetic strength.