1. Product Introduction

Countersunk hole SmCo magnets are sintered high-temperature rare-earth magnetic steels with integrally machined tapered countersunk screw holes. After screw fastening, the screw heads are fully embedded to ensure a completely flat surface. Featuring excellent high-temperature resistance and natural corrosion resistance, SmCo magnets require no electroplating treatment. They are specially designed for mechanical fixing in working environments above 180℃.

For detailed grades and parameters, please refer to our SmCo Magnet Performance Chart.

2. Product Classification

Round Countersunk Hole SmCo MagnetsDisc magnets with central countersunk holes, widely used for miniature sensors and high-temperature testing equipment.

Block Countersunk Hole SmCo MagnetsSquare magnets with single or double countersunk holes, ideal for high-temperature tooling fixtures and mold positioning.

Special-shaped Countersunk Hole SmCo MagnetsArc and step-shaped SmCo magnets with customized countersunk holes, applied in high-temperature servo motors.

3. Magnetic Grades & Performance

SmCo5 (1:5 Series): Max working temperature 250℃, suitable for low-temperature and medium-small power high-temperature devices.

Sm2Co17 (2:17 Series): Max working temperature 300℃–350℃, applied in military, aerospace and long-term high-temperature equipment.

Core Characteristics: Extremely low temperature coefficient, excellent oxidation and corrosion resistance, no coating protection required.

4. Core Advantages

Super High Temperature ResistanceNo demagnetization under continuous high-temperature conditions, far exceeding the performance of high-temperature NdFeB magnets.

Reliable Mechanical FixingIntegrated countersunk hole design allows firm screw locking, avoiding glue failure and displacement in high-temperature environments.

Natural Rust & Oxidation ResistanceNo electroplating process required, saving processing steps and improving durability.

High Precision CustomizationSupport non-standard dimensions and various customized countersunk hole specifications.

Stable Magnetic PerformanceStable output from low temperature to ultra-high temperature with minimal magnetic fluctuation under temperature difference changes.

5. Application Scenarios

Widely used in high-temperature sensors, aerospace accessories, military instruments, high-temperature magnetic tooling, petrochemical magnetic components, microwave devices, high-temperature motors, vacuum equipment and medical high-temperature testing instruments.

6. Usage Precautions

SmCo material is brittle. Apply gentle torque during screw locking to prevent cracking. Edge chamfering is recommended for sharp corners to avoid chipping.

Select Sm2Co17 (2:17) series for long-term working temperatures above 180℃.

Countersunk hole angles can be customized at 82° or 90° according to matching screw specifications.

7. Our Service

We support sample customization for round, block and special-shaped countersunk SmCo magnets. Our professional engineers provide targeted grade selection and hole size optimization solutions. OEM mass production and one-stop customized supply are available.