N42 Neodymium Disc Magnets — 8 x 1 mm
Nickel-Copper-Nickel coated • Axially magnetised • Packs of 1, 10, 25, 50 and 100
The strongest 1 mm disc we stock. 430 g of hold from a magnet the thickness of a beer mat — for card, board, timber, fabric and every job where you want to glue on rather than drill in.
Why this size
✓ Serious hold, almost no thickness. 430 g from a disc 1 mm tall. Our 5 x 2 mm magnet pulls a comparable 470 g but needs twice the depth. If your material is thin, this is the strongest thing that will fit.
✓ Calculated pull: 430 g at direct contact. Zero gap, clean flat steel. Magnet-to-magnet also 430 g. Reference value, not a guaranteed working load.
✓ Nearly 50% more than our 6 x 1 mm disc. 430 g against 290 g, for two extra millimetres of width and no extra depth at all.
✓ Wide face, stable and flat. An 8 mm disc spreads its grip properly, so a lid, flap or sign sits down evenly instead of pivoting on one point.
✓ Honest N42 grade. We state the grade we actually buy. If you see the same disc advertised as N52 at this size, treat the claim with caution.
What it is
A sintered neodymium (NdFeB) disc, 8 mm across and 1 mm thick, magnetised through its thickness — the poles are the two flat faces, not the edge. Two magnets meet face to face, the join sits flat and closes cleanly.
This shape exists because of a simple piece of physics we lean on throughout the range: holding force follows the area of the pole face far more than it follows how tall the magnet is. Make a disc wider and you gain a great deal. Make it taller and you gain steadily less. An 8 mm disc only 1 mm thick therefore out-pulls magnets several times its height, while taking up almost no space in the material.
That makes it the natural choice for craft and light DIY work, where the constraint is nearly always thickness rather than surface area. It sandwiches between two layers of card, hides under veneer or fabric, and glues flat to the back of a sign or a picture frame without adding any noticeable standoff.
Specifications
| Diameter |
8 mm |
| Thickness |
1 mm |
| Weight per magnet |
0.38 g |
| Material |
Sintered neodymium iron boron (NdFeB) |
| Grade |
N42 |
| Coating |
Nickel-Copper-Nickel (NiCuNi), triple layer |
| Magnetisation |
Axial — poles on the flat faces |
| Pull to steel (calculated) |
430 g / 4.22 N at direct contact, zero gap |
| Magnet-to-magnet pull |
430 g, bare faces in direct contact |
| Shear (sideways) estimate |
Approximately 60 g — sideways load is far weaker than direct pull |
| Drill bit size |
8 mm |
| 3D print hole size |
8.1 mm |
| Maximum working temperature |
Approximately 80°C — standard for N42 |
| Country of manufacture |
China |
Pull figures are calculated reference values for a clean, flat, direct steel contact with no air gap. Paint, varnish, glue layers, fabric, card, curved surfaces and any gap at all will reduce holding force, in some cases substantially. Treat these numbers as a way to compare sizes to each other, not as a guaranteed working load.
What you get
▪ The pack size you select from the dropdown: 1, 10, 25, 50 or 100 magnets
▪ Supplied stacked pole-to-pole in a resealable bag
▪ Every magnet is the same 8 x 1 mm N42 disc — the only difference between variants is the count
What people use this size for
Signage, display and retail
Changeable price tickets and shelf talkers • exhibition and craft fair display boards • menu boards and sandwich board inserts • poster and print holders that swap over without pins • name badges backed onto a steel plate. The wide face is what stops a card sign from sagging at the corners.
Card making, paper craft and bookbinding
Closures on larger cards, folios and portfolios • magnetic flaps on gift and presentation boxes • journal, album and menu covers • sample books and swatch folders • pop-up mechanisms. Glued between two layers of card the join disappears completely.
Home and office
Fridge magnets and photo displays • noticeboards, planners and memo boards • light cupboard, cabinet and jewellery box catches • curtain and blind tie-backs • picture frames and lightweight wall fittings • cable and lead tidies against a steel desk frame.
Sewing, textiles and leatherwork
Bag, purse and satchel closures • clasps hidden inside a lining • cosplay and costume fastenings where a visible popper would spoil the piece • removable trims and appliqué. Encase them in fabric or leather rather than gluing bare metal against cloth.
Woodwork, model making and terrain
Cabinet door and drawer catches • removable panels and access covers in thin ply or MDF • hidden closures on boxes and trinket cases • removable terrain boards and modular display sections • large display bases and plinths.
Choosing between sizes
Choose 8 x 2 mm instead when: you need a much firmer hold and have the depth for it — the same 8 mm footprint, 880 g instead of 430 g.
Choose 6 x 1 mm instead when: 8 mm is wider than the pocket or the part allows. 290 g, same 1 mm thickness.
A note on closures through material: whatever sits between the two magnets counts as a gap, and gaps cost holding force quickly. Two layers of thick card, or a leather flap, can easily halve what you feel compared with the 430 g figure. If a closure needs to feel positive through material, size up rather than settling for a weak click.
Working with them
Mark the stack before you separate it. Put a dot of permanent marker on one face of the whole stack while it is still assembled. Every magnet then carries the same reference face, so paired closures always attract instead of pushing apart. Getting one magnet the wrong way round is the most common mistake by a wide margin, and it is invisible once the magnet is glued in and covered over.
Glue both halves in place while they are stuck together. Fit the first magnet, let its partner snap onto it, apply adhesive to the exposed face, then close the lid or flap and let it cure. The pair aligns itself perfectly and the polarity cannot be wrong. Slip a piece of paper between them if you need to be able to part them again while the glue is green.
One magnet and a steel washer is often the better closure. There is no polarity to get wrong, it costs half as much, and on a flap or lid you will barely notice the difference in feel. Save magnet pairs for joins that need the extra grip.
Choose the adhesive for the material. Thin superglue for a snug recess in plastic, resin or hardwood. Epoxy for a flat surface mount, especially on metal or glazed ceramic. PVA and glue sticks will not hold a magnet of this strength on card — use a tacky craft glue or double-sided foam tape, and cover the magnet with a layer of card or paper rather than relying on the glue alone.
Keep them away from your work. Steel rulers, scissors, craft knives, pins, sewing machine beds and cutting mats with metal edges all attract these across a surprising distance. Keep the pack closed and off the bench while you are cutting.
Honest limitations
▪ Anything between the faces cuts the hold sharply. The 430 g figure is bare magnet against clean flat steel. Through two layers of card, a lining fabric or a coat of varnish you will feel noticeably less. This is normal magnet behaviour, not a fault.
▪ Sideways load is much weaker than straight pull. Around 60 g. A flap that slides across its partner will move far more easily than one that lifts straight off. Design the closure so the load pulls the faces apart.
▪ It needs 8 mm of width. That is a wide footprint on a small piece, and an 8 mm hole is a lot to take out of a narrow rail or a slim frame.
▪ Wide thin discs are the most fragile shape we sell. Neodymium is sintered and brittle, and there is very little material through the middle of an 8 x 1 mm disc. Letting a pair snap together across a gap is the usual way one cracks.
▪ Easy to seat crooked. At 1 mm thick there is almost no side wall to hold the disc square in a recess. Press it flat while the glue grabs — a magnet sitting at a slight angle loses contact area and holding force.
▪ Indoor use. NiCuNi plating resists handling and normal indoor humidity, but it is not a marine or outdoor coating. On an exterior door, in a bathroom or on garden signage, seal the magnet into the material rather than leaving it exposed.
▪ Heat weakens them permanently. Above roughly 80°C an N42 magnet loses strength and does not recover on cooling. Keep them away from ovens, heat guns, curing lamps and hot cars — and do not put a magnetised piece through a laminator.
Important safety information
Warning — strong magnets. For adult hobby, craft and technical use. Not a toy.
Swallowing two or more magnets can cause serious internal injury. Magnets can attract to each other through the wall of the intestine, causing blockage or perforation. Seek immediate medical attention if a magnet is swallowed or inhaled. Keep away from children and pets at all times.
If you are making an item that a child may handle, the magnets must be fully enclosed and securely fixed so they cannot work loose. Loose or surface-mounted magnets are not suitable for anything intended for children.
Keep magnets away from pacemakers, implanted defibrillators and hearing aids. Keep them away from bank cards, hard drives and other magnetic media.
Handle with care — neodymium is brittle and can chip. Store magnets in their bag, away from loose steel and craft blades.
Dispatch
▪ Same-day dispatch on orders placed before 3 PM, Monday to Friday
▪ Sent from our own unit in Derby — we pick and pack everything ourselves
▪ Magnets are shipped within the UK only
Hobby Heaven
By Hobbyists. For Hobbyists.
We are a small family-run business in Derby, run by people who make things themselves. We publish the grade we buy and the test conditions behind every pull figure, because that is the information we wanted when we were sourcing magnets for our own projects. If something is not right, message us and we will sort it.
N42 Neodymium Disc Magnets — 8 x 1 mm
Nickel-Copper-Nickel coated • Axially magnetised • Packs of 1, 10, 25, 50 and 100
The strongest 1 mm disc we stock. 430 g of hold from a magnet the thickness of a beer mat — for card, board, timber, fabric and every job where you want to glue on rather than drill in.
Why this size
✓ Serious hold, almost no thickness. 430 g from a disc 1 mm tall. Our 5 x 2 mm magnet pulls a comparable 470 g but needs twice the depth. If your material is thin, this is the strongest thing that will fit.
✓ Calculated pull: 430 g at direct contact. Zero gap, clean flat steel. Magnet-to-magnet also 430 g. Reference value, not a guaranteed working load.
✓ Nearly 50% more than our 6 x 1 mm disc. 430 g against 290 g, for two extra millimetres of width and no extra depth at all.
✓ Wide face, stable and flat. An 8 mm disc spreads its grip properly, so a lid, flap or sign sits down evenly instead of pivoting on one point.
✓ Honest N42 grade. We state the grade we actually buy. If you see the same disc advertised as N52 at this size, treat the claim with caution.
What it is
A sintered neodymium (NdFeB) disc, 8 mm across and 1 mm thick, magnetised through its thickness — the poles are the two flat faces, not the edge. Two magnets meet face to face, the join sits flat and closes cleanly.
This shape exists because of a simple piece of physics we lean on throughout the range: holding force follows the area of the pole face far more than it follows how tall the magnet is. Make a disc wider and you gain a great deal. Make it taller and you gain steadily less. An 8 mm disc only 1 mm thick therefore out-pulls magnets several times its height, while taking up almost no space in the material.
That makes it the natural choice for craft and light DIY work, where the constraint is nearly always thickness rather than surface area. It sandwiches between two layers of card, hides under veneer or fabric, and glues flat to the back of a sign or a picture frame without adding any noticeable standoff.
Specifications
Diameter
8 mm
Thickness
1 mm
Weight per magnet
0.38 g
Material
Sintered neodymium iron boron (NdFeB)
Grade
N42
Coating
Nickel-Copper-Nickel (NiCuNi), triple layer
Magnetisation
Axial — poles on the flat faces
Pull to steel (calculated)
430 g / 4.22 N at direct contact, zero gap
Magnet-to-magnet pull
430 g, bare faces in direct contact
Shear (sideways) estimate
Approximately 60 g — sideways load is far weaker than direct pull
Drill bit size
8 mm
3D print hole size
8.1 mm
Maximum working temperature
Approximately 80°C — standard for N42
Country of manufacture
China
Pull figures are calculated reference values for a clean, flat, direct steel contact with no air gap. Paint, varnish, glue layers, fabric, card, curved surfaces and any gap at all will reduce holding force, in some cases substantially. Treat these numbers as a way to compare sizes to each other, not as a guaranteed working load.
What you get
▪ The pack size you select from the dropdown: 1, 10, 25, 50 or 100 magnets
▪ Supplied stacked pole-to-pole in a resealable bag
▪ Every magnet is the same 8 x 1 mm N42 disc — the only difference between variants is the count
What people use this size for
Signage, display and retail
Changeable price tickets and shelf talkers • exhibition and craft fair display boards • menu boards and sandwich board inserts • poster and print holders that swap over without pins • name badges backed onto a steel plate. The wide face is what stops a card sign from sagging at the corners.
Card making, paper craft and bookbinding
Closures on larger cards, folios and portfolios • magnetic flaps on gift and presentation boxes • journal, album and menu covers • sample books and swatch folders • pop-up mechanisms. Glued between two layers of card the join disappears completely.
Home and office
Fridge magnets and photo displays • noticeboards, planners and memo boards • light cupboard, cabinet and jewellery box catches • curtain and blind tie-backs • picture frames and lightweight wall fittings • cable and lead tidies against a steel desk frame.
Sewing, textiles and leatherwork
Bag, purse and satchel closures • clasps hidden inside a lining • cosplay and costume fastenings where a visible popper would spoil the piece • removable trims and appliqué. Encase them in fabric or leather rather than gluing bare metal against cloth.
Woodwork, model making and terrain
Cabinet door and drawer catches • removable panels and access covers in thin ply or MDF • hidden closures on boxes and trinket cases • removable terrain boards and modular display sections • large display bases and plinths.
Choosing between sizes
Choose 8 x 2 mm instead when: you need a much firmer hold and have the depth for it — the same 8 mm footprint, 880 g instead of 430 g.
Choose 6 x 1 mm instead when: 8 mm is wider than the pocket or the part allows. 290 g, same 1 mm thickness.
A note on closures through material: whatever sits between the two magnets counts as a gap, and gaps cost holding force quickly. Two layers of thick card, or a leather flap, can easily halve what you feel compared with the 430 g figure. If a closure needs to feel positive through material, size up rather than settling for a weak click.
Working with them
Mark the stack before you separate it. Put a dot of permanent marker on one face of the whole stack while it is still assembled. Every magnet then carries the same reference face, so paired closures always attract instead of pushing apart. Getting one magnet the wrong way round is the most common mistake by a wide margin, and it is invisible once the magnet is glued in and covered over.
Glue both halves in place while they are stuck together. Fit the first magnet, let its partner snap onto it, apply adhesive to the exposed face, then close the lid or flap and let it cure. The pair aligns itself perfectly and the polarity cannot be wrong. Slip a piece of paper between them if you need to be able to part them again while the glue is green.
One magnet and a steel washer is often the better closure. There is no polarity to get wrong, it costs half as much, and on a flap or lid you will barely notice the difference in feel. Save magnet pairs for joins that need the extra grip.
Choose the adhesive for the material. Thin superglue for a snug recess in plastic, resin or hardwood. Epoxy for a flat surface mount, especially on metal or glazed ceramic. PVA and glue sticks will not hold a magnet of this strength on card — use a tacky craft glue or double-sided foam tape, and cover the magnet with a layer of card or paper rather than relying on the glue alone.
Keep them away from your work. Steel rulers, scissors, craft knives, pins, sewing machine beds and cutting mats with metal edges all attract these across a surprising distance. Keep the pack closed and off the bench while you are cutting.
Honest limitations
▪ Anything between the faces cuts the hold sharply. The 430 g figure is bare magnet against clean flat steel. Through two layers of card, a lining fabric or a coat of varnish you will feel noticeably less. This is normal magnet behaviour, not a fault.
▪ Sideways load is much weaker than straight pull. Around 60 g. A flap that slides across its partner will move far more easily than one that lifts straight off. Design the closure so the load pulls the faces apart.
▪ It needs 8 mm of width. That is a wide footprint on a small piece, and an 8 mm hole is a lot to take out of a narrow rail or a slim frame.
▪ Wide thin discs are the most fragile shape we sell. Neodymium is sintered and brittle, and there is very little material through the middle of an 8 x 1 mm disc. Letting a pair snap together across a gap is the usual way one cracks.
▪ Easy to seat crooked. At 1 mm thick there is almost no side wall to hold the disc square in a recess. Press it flat while the glue grabs — a magnet sitting at a slight angle loses contact area and holding force.
▪ Indoor use. NiCuNi plating resists handling and normal indoor humidity, but it is not a marine or outdoor coating. On an exterior door, in a bathroom or on garden signage, seal the magnet into the material rather than leaving it exposed.
▪ Heat weakens them permanently. Above roughly 80°C an N42 magnet loses strength and does not recover on cooling. Keep them away from ovens, heat guns, curing lamps and hot cars — and do not put a magnetised piece through a laminator.
Important safety information
Warning — strong magnets. For adult hobby, craft and technical use. Not a toy.
Swallowing two or more magnets can cause serious internal injury. Magnets can attract to each other through the wall of the intestine, causing blockage or perforation. Seek immediate medical attention if a magnet is swallowed or inhaled. Keep away from children and pets at all times.
If you are making an item that a child may handle, the magnets must be fully enclosed and securely fixed so they cannot work loose. Loose or surface-mounted magnets are not suitable for anything intended for children.
Keep magnets away from pacemakers, implanted defibrillators and hearing aids. Keep them away from bank cards, hard drives and other magnetic media.
Handle with care — neodymium is brittle and can chip. Store magnets in their bag, away from loose steel and craft blades.
Dispatch
▪ Same-day dispatch on orders placed before 3 PM, Monday to Friday
▪ Sent from our own unit in Derby — we pick and pack everything ourselves
▪ Magnets are shipped within the UK only
Hobby Heaven
By Hobbyists. For Hobbyists.
We are a small family-run business in Derby, run by people who make things themselves. We publish the grade we buy and the test conditions behind every pull figure, because that is the information we wanted when we were sourcing magnets for our own projects. If something is not right, message us and we will sort it.
Specifications
-
Choose Quantity
10
-
Brand
Hobby Heaven
-
Thickness
1mm
-
Type
Disc Magnet
-
Shape
Disc
-
Item Diameter
8mm
-
Grade
N42
-
Coating
Nickel-Copper-Nickel (NiCuNi)
-
Magnetisation
Axial
-
Country of Origin
China
-
Colour
Silver
