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Find N35 20mm neodymium ring magnets for prototyping and sensors. Compare bore, thickness, coating, and local stock info for South African makers.
N35 grade ring magnet with central bore for shafts and fixings.
Confirm inner bore, thickness, coating and operating temperature.
Check Samrand stock, request VAT invoices and consider protective coatings.
The N35 neodymium ring magnet with a 20 mm outside diameter is a compact, high-remanence rare-earth magnet commonly used in electronics projects: encoding wheels, hall-effect sensor targets, small motor assemblies, magnetic latches, and custom fixtures. N35 denotes a grade with strong magnetic energy for its size; the ring form (with a central hole) lets you pass fasteners, shafts, or alignment pins through the centre for secure mechanical integration.
| Spec | Typical Value (20 mm ring) | Notes |
|---|---|---|
| Outer diameter | 20 mm | Primary size used for mounts and wheels |
| Inner diameter (bore) | 6 mm / 8 mm (SKU dependent) | Verify to match shaft or screw |
| Thickness | 2-5 mm | Thicker = stronger pull force |
| Coating | Ni-Cu-Ni common | Improves corrosion resistance for hobby/indoor use |
Practical note: when sourcing in South Africa, confirm bore size and thickness on the product page. Many Communica SKUs list dimensions and coating; stock and lead times vary between Samrand, Pretoria CBD, and Cape Town branches.
Choose the specific 20 mm ring magnet variant based on three primary factors: mechanical fit (inner bore and thickness), magnetic performance (grade and thickness determine pull force), and environment (coating and operating temperature). For sensor applications, align the pole face so the field at the sensor meets the required flux density - small changes in distance dramatically change the reading.
Exact pull-force calculations require vendor data or finite-element analysis. As a rule of thumb, doubling thickness roughly increases pull force significantly; halving air gap between magnet and ferrous plate increases the flux coupling substantially. For quick planning, assume a 20 mm x 3 mm N35 ring on a flat 6 mm steel plate might produce a holding force on the order of 1-4 kg under ideal contact (estimate only). In South African projects, budget for higher-than-estimated forces when designing latches or motor couplings.
Shaft or screw through bore
|
[===] <--- 20 mm ring magnet (face towards sensor or plate)
|||
---- <--- mounting plate or wheel
Place hall sensor ~1-5 mm from magnet face; adjust for expected switching point.
Communica stocks a range of magnets and small hardware suited to makers, students, and engineers. Typical price ranges for a single 20 mm N35 ring magnet are approximately ZAR 15-60 per piece depending on bore, thickness, and coating; actual pricing varies and is indicative only. Check the Samrand branch for the deepest component stock; alternate branches may have limited quantities or lead times. For education and institutional purchases, request a VAT invoice and quote through account services if required.
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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