The Small Disc with Hole Magnet for Miniature Devices is a precision-engineered magnetic component tailored to the compact, high-performance needs of miniature electronics, medical devices, and micro-mechanical systems. Typically ranging in outer diameter from 3mm to 15mm, inner hole diameter from 1mm to 5mm, and thickness from 1mm to 3mm, this tiny magnet is designed to fit within the tight spaces of devices like smartwatches, hearing aids, micro-sensors, and miniaturized robots. Crafted from high-grade neodymium (often grade N42 or higher) for exceptional magnetic strength relative to its size, it delivers controlled holding force (ranging from 0.5kg to 5kg) that secures components without adding unnecessary bulk—critical for devices where every millimeter of space matters.

A key advantage of this small disc magnet is its precision-machined hole, which enables seamless integration into miniature device assemblies. The hole is drilled using computer numerical control (CNC) technology, ensuring a tolerance of ±0.02mm—small enough to accommodate micro-screws, pins, or wires that fasten the magnet to circuit boards, plastic housings, or metal brackets. For example, in a smartwatch’s battery compartment, a 5mm outer diameter, 2mm inner hole neodymium disc magnet is used to hold the battery cover in place. The magnet’s small size fits within the watch’s slim profile, while the hole allows a tiny screw to secure it to the watch case, ensuring the battery cover stays closed during daily wear but can be easily removed for battery replacement.

In medical devices, such as hearing aids or insulin pumps, the Small Disc with Hole Magnet plays a vital role in component alignment and actuation. A 3mm disc magnet with a 1mm hole might be integrated into a hearing aid’s speaker module, where it helps position the speaker diaphragm precisely. The magnet’s magnetic force ensures the diaphragm remains stable, while the hole allows for electrical wire passage, enabling the speaker to receive signals from the device’s circuit board. The magnet’s biocompatible coating (often epoxy or PTFE) prevents skin irritation, making it safe for close contact with the user’s body.

Micro-sensors, which are used in applications like environmental monitoring or wearable fitness trackers, also rely on this magnet. A 8mm disc magnet with a 3mm hole can be mounted near a sensor to create a reference magnetic field. As the sensor detects changes in this field (caused by motion or external factors), it converts the data into electrical signals—essential for tracking steps in a fitness tracker or measuring air quality in a portable sensor. The hole in the magnet allows for precise mounting, ensuring the distance between the magnet and sensor remains consistent, which is critical for accurate readings.

Durability is another priority, as miniature devices are often subjected to frequent handling and environmental stress. The neodymium core is coated with a thin layer of nickel-copper-nickel or epoxy, which resists corrosion, scratches, and wear. This coating protects the magnet from moisture (like sweat in wearable devices) or dust (in industrial micro-sensors), ensuring it maintains its magnetic strength and performance over the device’s lifespan. Whether used in consumer electronics, medical devices, or micro-sensors, the Small Disc with Hole Magnet for Miniature Devices combines miniaturization, precision, and reliability—making it a foundational component in the growing field of micro-technology.