Strong N52 Countersunk Magnets – Maximum Holding Power with Precision Mounting
When your application requires the absolute highest magnetic force combined with mechanical fastening, strong N52 countersunk magnets are the definitive solution. With a maximum energy product of 50‑52 MGOe and remanence of 1.43‑1.48 T, N52 delivers approximately 30% more holding power than N42 and over 40% more than N35 in the same dimensions – enabling smaller, lighter, and more efficient designs. The precision‑machined countersunk hole (available for M3, M4, M5, M6, or M8 screws) allows flush mounting with standard flat‑head screws, providing a secure, vibration‑resistant attachment that won't loosen over time. Our strong N52 countersunk magnets are manufactured from 100% virgin rare‑earth materials (purity ≥95%) in our vertically integrated, IATF 16949‑certified facility. The Ni‑Cu‑Ni triple coating (13‑18 μm) ensures corrosion resistance (72h salt spray tested) and a professional, bright finish. Diameters range from 12 mm to 60 mm, with thicknesses from 3 mm to 15 mm, and we can produce custom countersink depths, angles (90° or 82°), and even off‑center holes to meet your exact drawing. Typical applications include heavy‑duty magnetic latches, machinery guards, removable panels, industrial jigs, point‑of‑purchase displays, and automotive holding brackets. We also offer alternative coatings (epoxy for electrical insulation, gold for medical devices) and high‑temperature N52SH grades for operation up to 150°C. Every magnet is 100% inspected for magnetic flux, dimensional accuracy (including countersink centering), and coating thickness. Backed by our 20+ years of magnetic engineering expertise, we provide free samples, custom packaging, and fast lead times for wholesale and OEM buyers.
Technical Specifications – Strong N52 Countersunk Magnets
The table below lists standard configurations for our strong N52 countersunk magnets. Custom sizes, thread sizes, and coatings are available.
| Model | Diameter (mm) | Thickness (mm) | Screw Size | Countersink Dia. (mm) | Pull Force* (kgf) | Magnet Grade | Coating |
|---|---|---|---|---|---|---|---|
| CSN52‑12x3‑M3 | 12 | 3 | M3 | 6.0 | 3.5 | N52 | Ni‑Cu‑Ni |
| CSN52‑16x5‑M4 | 16 | 5 | M4 | 8.0 | 8.5 | N52 | Ni‑Cu‑Ni |
| CSN52‑20x6‑M4 | 20 | 6 | M4 | 8.5 | 14.0 | N52 | Ni‑Cu‑Ni |
| CSN52‑25x8‑M5 | 25 | 8 | M5 | 10.0 | 25.0 | N52 | Ni‑Cu‑Ni |
| CSN52‑32x10‑M6 | 32 | 10 | M6 | 12.5 | 45.0 | N52 | Ni‑Cu‑Ni |
| CSN52‑40x12‑M6 | 40 | 12 | M6 | 13.0 | 72.0 | N52 | Ni‑Cu‑Ni |
| CSN52‑50x15‑M8 | 50 | 15 | M8 | 16.0 | 120.0 | N52 | Ni‑Cu‑Ni |
Magnetization Direction
Axial (for round countersunk discs); Through-thickness (for rectangular blocks); Custom orientation based on fastener and mounting surface orientation.
Why N52 Countersunk Magnets Are the Ultimate Choice
Maximum Magnetic Energy Density
At 52 MGOe, N52 represents the highest commercially available neodymium grade. A strong N52 countersunk magnet can replace a much larger N42 or N35 magnet, reducing material costs and assembly space while maintaining or increasing holding force.
Secure, Flush Mechanical Fixing
The countersunk hole accepts standard flat‑head screws, allowing the magnet to be bolted firmly to any surface. The screw head sits flush with the magnet face, ensuring no protrusions that could interfere with mating surfaces or create safety hazards.
Precision Machining & Tight Tolerances
Our CNC countersinking process ensures perfect centering within ±0.05 mm, consistent depth, and a smooth, burr‑free finish. Diameter tolerance: ±0.05 mm; thickness: ±0.03 mm.
Coating / Plating
Neodymium ring shaped magnets require protective coatings to prevent corrosion. Common options include nickel plating (Ni-Cu-Ni), zinc, epoxy, and gold. These thin layers provide durability without compromising magnetic performance, ensuring longevity in various environments while maintaining the magnet's structural integrity and functional characteristics.
Magnetic Grade Parameters
Packaging & Logistics – Ready for Global Shipment
Each magnet is individually wrapped in foam or placed in compartmentalized trays to protect the countersink edge. Outer cartons are reinforced for sea or air freight. Lead times: standard sizes 5‑7 days; custom sizes 10‑12 days. Free samples available for qualified projects. We support mixed orders and small MOQs.
Quality Assurance – Full Process Control for Superior Performance
Achieving consistent N52 performance requires uncompromised process control. Our facility produces the magnetic cores from 100% virgin rare‑earth materials (purity ≥95%) using vacuum induction melting, jet milling, and sintering under precise thermal profiles. After grinding to the required diameter and thickness, each magnet is CNC‑countersunk with diamond‑tipped tools, then Ni‑Cu‑Ni plated in automated barrel lines. Every strong N52 countersunk magnet is 100% inspected for magnetic flux (Helmholtz coil), dimensional accuracy (vision system or CMM), countersink centering and depth, and coating thickness (XRF). We also perform salt‑spray tests (ASTM B117) on sample batches. All products are supplied with a certificate of compliance and test report. Our IATF 16949 and ISO 9001 systems guarantee full traceability and consistent quality for automotive, industrial, and consumer OEMs.
FAQ
Q1: What makes N52 the strongest grade for countersunk magnets?
A1: N52 represents the highest commercially available energy product for neodymium magnets, with a maximum energy product of 52 MGOe (approx. 414 kJ/m³). It delivers the strongest magnetic force per unit volume among standard NdFeB grades, with remanence up to 1.43 T and coercivity around 915 kA/m. For countersunk magnets, this means exceptional holding power in a compact size – critical when space is limited but performance is non-negotiable. However, standard N52 has a maximum working temperature of only 80°C. For higher temperatures, choose temperature-stabilized versions like N52H or N52SH.
Q2: What is the advantage of a countersunk design in strong N52 magnets?
A2: A countersunk hole features a tapered recess that allows a flat‑head screw to sit flush with or slightly below the magnet surface. This creates a smooth, snag‑free finish while enabling secure mechanical fastening to any non‑magnetic surface. Unlike adhesives, screw mounting provides reliable, permanent attachment that won't fail over time. The countersunk design also minimizes the air gap between the magnet and the workpiece, maximizing the effective holding force. This makes N52 countersunk magnets ideal for applications requiring both strong magnetic attraction and secure, low‑profile installation.
Q3: What customization options are available for N52 countersunk magnets?
A3: N52 countersunk magnets can be customized in multiple ways. Shape: round, square, rectangular, or ring. Dimensions: outer diameter up to 240 mm, thickness 3–80 mm. Hole size: compatible with screws from M3 to M8 (e.g., #4, #6, #8 screws). Hole count: single or double holes. Coating: nickel‑copper‑nickel (standard), black epoxy, zinc, or gold. Magnetization direction: axial or radial. Tolerances can be as tight as ±0.004″ (±0.1 mm). Custom orders typically have a lead time of 8–14 days.