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N52 sintered NdFeB for maximum holding power in compact disc form
Countersunk hole enables flush screw mounting for clean, secure installations
Custom diameter/thickness/hole specs, coatings, and tolerances for EU/US industrial supply
N52 countersunk disc neodymium magnets are high-performance sintered NdFeB magnets designed for secure, flush screw mounting in industrial assemblies. The countersunk hole allows the screw head to sit flush with the magnet surface, improving stability and reducing interference in tight installations.
Typical grade values shown below. Actual holding force depends on magnet size, countersunk geometry, mating steel thickness/flatness, and air gap.
| Property | Typical Value | Unit |
|---|---|---|
| Remanence (Br) | 14.2 – 14.8 | kGs |
| Coercivity (Hcb) | ≥ 10.8 | kOe |
| Intrinsic Coercivity (Hcj) | ≥ 12.0 | kOe |
| Max Energy Product (BHmax) | 50 – 52 | MGOe |
| Max Working Temperature | 80°C (standard N grade) | °C |
| Parameter | Option / Range | Notes |
|---|---|---|
| Disc Diameter (D) | Custom | Common: small to medium sizes for fixtures and mounting |
| Thickness (T) | Custom | Magnetized axially through thickness |
| Hole Type | Countersunk (standard) | Optional: straight hole / counterbore by request |
| Countersunk Angle | 82° / 90° (custom) | Match screw standard (US/EU) |
| Hole Diameter | Custom | Matched to screw size (e.g., M3/M4/M5 or #6/#8) |
| Dimensional Tolerance | ±0.05 mm to ±0.10 mm | Depends on size and machining route |
Engineering note: Countersunk machining reduces magnet cross-section. For maximum holding force, confirm thickness and steel mating surface conditions (flatness, coating, and air gap).
| Coating | Protection Level | Typical Use | Notes |
|---|---|---|---|
| Ni-Cu-Ni | Standard | Indoor / general industrial | Most common finish |
| Epoxy | High | Humidity / mild outdoor | Improved corrosion resistance |
| Zinc (Zn) | Basic | Cost-sensitive applications | Lower corrosion resistance vs Ni/Epoxy |
| Black Nickel / Other | Custom | Appearance or special needs | By requirement |
Countersunk means the hole is conical so a flat-head screw can sit flush with the magnet surface. This improves mounting stability and keeps the assembly profile low.
Yes. We can customize the countersink angle (commonly 82° or 90°) and hole diameter to fit metric screws (M3/M4/M5, etc.) or imperial sizes (#6/#8, etc.). Please specify your screw standard.
NdFeB magnets are brittle. To reduce risk, use proper screw fit, avoid overtightening, and ensure the countersink matches the screw head angle. For high mechanical shock, consider protective housings or bonded/encapsulated designs.
N52 provides maximum strength at room temperature, but if operating temperature exceeds 80°C, high-temperature grades (H/SH/UH/EH/AH) may be more suitable depending on your environment.
Please provide disc diameter and thickness, screw size/standard, countersink angle, coating requirement, operating temperature/environment, and quantity.
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