Pack of 1 - single 10 x 3 mm N42 neodymium disc magnet on a half-inch reference grid

10mm x 3mm N42 Neodymium Disc Magnets

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$3.52
$3.52
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Pack of 1 - single 10 x 3 mm N42 neodymium disc magnet on a half-inch reference grid
  • Pack of 1 - single 10 x 3 mm N42 neodymium disc magnet on a half-inch reference grid
  • Overview panel for 10 x 3 mm N42 neodymium disc magnets - 1900 g calculated pull to steel at zero gap, NiCuNi plating, axial magnetisation
  • Stacked rows of 10 x 3 mm N42 neodymium disc magnets shown at real size on a half-inch reference grid
  • Infographic - calculated pull reference of 1900 g for a 10 x 3 mm N42 disc magnet on clean flat steel with zero gap
  • Wargaming miniature parts laid out on a cutting mat with 10 mm disc magnets scattered for magnetising
  • Miniature figure and shoulder pad parts on a cutting mat with 10 mm disc magnets ready for fitting
  • Rows of 10 x 3 mm neodymium disc magnets stacked into long columns on a dark background
  • Angled view of 10 x 3 mm neodymium disc magnets stacked in parallel rows on a dark background
  • Long stacked rows of 10 x 3 mm neodymium disc magnets viewed end-on on a dark background
  • Magnet safety warning panel: swallowing two or more magnets can cause serious internal injury; keep away from children and medical devices, handle and store with care
  • Infographic - separating small disc magnets safely: slide sideways, keep the stack controlled, mind loose steel and blades
  • Infographic - how diameter and thickness affect disc magnet holding strength and how to read the D x H size format
  • Size chart comparing 2 x 1 mm, 3 x 2 mm and 5 x 3 mm disc magnets on a cutting mat with calculated zero-gap pull of 50 g, 210 g and 650 g
  • Infographic explaining magnet holding force: full pull at direct contact, weaker shear under sideways load, reduced hold across a gap
10mm x 3mm N42 Neodymium Disc Magnets
Hobby Heaven

10mm x 3mm N42 Neodymium Disc Magnets

$3.52
$3.52
Shipping calculated at checkout.
Pack Size
Number of packs

In stock · same-day dispatch before 3pm

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DWG · Product Information

PROJ: MAG/D10X3/1 · SHEET 2 / 4

View · Overview

Product overview

These 10 x 3 mm N42 neodymium disc magnets form the heavy-duty end of the 10 mm ladder. Their broad, axially magnetised faces concentrate the connection across the full diameter, while the NiCuNi coating supports normal indoor workshop, scenery and transport-case use.

With a calculated, zero-gap pull reference figure of 1,900 g, this size is intended for large modular scenery sections, transport boxes and fixed workshop mounts that must resist movement during handling. The sideways shear estimate is approximately 280 g, so a locating edge or mechanical stop is still useful where the load tries to slide the parts apart. Choose this depth when the 10 x 2 mm format does not provide enough hold and the material can accept the larger socket without weakening the surrounding structure.

Drill a 10 mm opening to a depth of 3.2 mm, or design a 10.1 mm hole into a 3D-printed component. Keep the recess flat and square, verify polarity before adding adhesive and anchor the magnet along the socket wall rather than leaving a thick glue layer beneath the face. Allow the bond to cure fully before testing. For broad panels, include a locating feature so the magnets hold the assembly closed without being responsible for alignment. Available in packs of 1, 10, 25, 50 and 100 magnets.

Notes · Q & A

Which magnet size should I choose for miniatures?

A 2×1 mm disc suits infantry weapon swaps, while 3×1 mm is a practical step up for arms and small components. Sizes around 3×2 to 5×2 mm work well for basing and larger parts, with 5×3 mm and above better suited to vehicles, large models and army transport. Each listing includes a calculated pull figure in grams so you can compare sizes on the same basis.

What does the N42 magnet grade mean?

The grade describes the magnetic material: at identical dimensions, a higher number generally produces more pull. N52 is typically around 20–25% stronger than N42 at the same size, but increasing the magnet's diameter or thickness usually makes a larger practical difference than changing grade alone. Our range is clearly specified as N42.

How do I keep the polarity consistent?

Before separating the stack, mark one face with a permanent marker and use that mark as your polarity reference. Dry-fit every pair before applying adhesive, and glue the two halves while the magnets are still attracting each other in the intended orientation. Reversing one magnet is one of the most common magnetisation mistakes.

What size hole should I drill for a magnet?

Use a drill matching the magnet diameter; for a designed 3D-printed socket, allow roughly 0.1 mm extra diameter. Make the recess approximately the magnet thickness plus 0.2 mm for adhesive so the face can sit level with the surrounding surface. CA adhesive is suitable for fixing these magnets into plastic, resin or metal parts.

How should neodymium magnets be handled safely?

Swallowing two or more magnets can cause serious internal injury, so keep loose magnets away from children and use them only for adult hobby work. Neodymium magnets are also brittle and may chip if allowed to snap together. Bring them together slowly from the edge rather than letting their flat faces strike each other.

Notes · Logistics

Shipping

Orders placed before 3pm (Mon–Fri) are dispatched the same day. UK delivery is by Royal Mail 24 Tracked. Free UK delivery on orders over £70. International delivery available via Royal Mail International Tracked or courier.

Returns

If you're not happy with your purchase, contact us within 30 days for a full refund or exchange. Items must be unused and in original packaging.

Table · Specification

Technical specifications

Product details
Brand
Hobby Heaven
Product code
MAG/D10X3/1
Type
Accessories
Shipping weight
60 g
Made in
China
Dimensions & contents
Diameter
10 mm
Thickness
3 mm
Weight per magnet
1.79 g
Magnetic properties
Grade
N42
Pull to steel (calculated, zero gap)
1900 g
Pull to steel
18.63 N
Magnet-to-magnet pull
1900 g
Shear resistance (estimate)
280 g
Magnetisation
Axial
Max working temperature
80 °C
Coating
Nickel-Copper-Nickel (NiCuNi)
Usage & compatibility
Drill bit
10 mm
Hole in 3D prints
10.1 mm
Recess depth
3.2 mm
Size comparison
10 mm — a 5p coin is 18 mm across
Related sizes
Also consider
8mm x 3mm N42 Neodymium Disc Magnets
12mm x 2mm N42 Neodymium Disc Magnets
15mm x 3mm N42 Neodymium Disc Magnets
20mm x 3mm N42 Neodymium Disc Magnets

Product

10mm x 3mm N42 Neodymium Disc Magnets

Code (proj)

MAG/D10X3/1

Ship. weight

60 g

Brand

Hobby Heaven

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