---
product_id: 731906474
title: "40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets"
brand: "diymag"
price: "2474257 kr"
currency: ISK
in_stock: false
reviews_count: 5
category: "Diymag"
url: https://www.desertcart.is/products/731906474-40x40x20mm-super-strong-neodymium-block-magnet-permanent-magnet-the-worlds
store_origin: IS
region: Iceland
---

# N52 grade - strongest rare earth 40x40x20 mm compact size 132.2 lbs pull force 40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets

**Brand:** diymag
**Price:** 2474257 kr
**Availability:** ❌ Out of Stock

## Summary

> 🧲 Feel the pull of power — the magnet that means business!

## Quick Answers

- **What is this?** 40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets by diymag
- **How much does it cost?** 2474257 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/731906474-40x40x20mm-super-strong-neodymium-block-magnet-permanent-magnet-the-worlds)

## Best For

- diymag enthusiasts

## Why This Product

- Trusted diymag brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Premium N52 Grade:** Top-tier neodymium ensures maximum magnetic strength and reliability.
- • **Compact Yet Mighty:** 40x40x20 mm size fits perfectly in your toolkit without bulk.
- • **Versatile Applications:** Ideal for tool organization, industrial demos, and magnetic experiments.
- • **Unmatched Magnetic Power:** Hold up to 132.2 lbs per magnet—serious grip for serious pros.
- • **Engineered for Professionals:** Not a toy—designed for expert use with safety and precision in mind.

## Overview

This 40x40x20mm N52 grade neodymium block magnet delivers an extraordinary 132.2 lbs of pull force per piece, making it one of the strongest permanent rare earth magnets available. Designed for professional use, its compact square form factor balances power with portability. Ideal for industrial, educational, and precision tool applications, it demands careful handling due to its intense magnetic strength and brittleness.

## Description

Product description This is not a toy. Do not give to children. Legal Disclaimer Not for purchase under 18

Review: This is an interesting review because the number of stars for easy to remove and durability are both one. Normally, a one-star review is bad. But in this case, less starts is good news! Easy to remove would mean a weak magnet, and neodymium magnets are not durable. These are facts. The product advertisement on desertcart covers some of these points. But the question should have been "magnetic grip" and that would have been five stars. Complaining about a neodymium magnet being fragile is like saying an eggshell is fragile. It is the way it is. So, first off, you want powerful magnets? Order these. Good price, fast shipping, good product. You will get what you want. But there is more to the story. These are dangerous in even in experienced hands. I am experienced - and still had troubles. This is not the manufacturers or vendors fault. These are powerful magnets, and any difficulties are the responsibility of the user. Don't order these as toys. To avoid disappointment, you should know in advance exactly what you wish to do with these. I did know, and I had difficulties, because these magnets are so strong they are actually annoying!! I did not want multiple powerful magnets because of the need to avoid crashing magnets together which breaks them, creating sharp shards of metal, crushing fingers in the process. I knew I wanted a single magnet, to demonstrate the long distance effects of a powerful magnet. Other websites had what are probably better magnets at a similar price, but nobody could beat desertcart's shipping costs and time. So I bought four of these. They are shipped two to a small box, together, with a small spacer between them. I knew already I wanted these magnets stuck together into one big one. I knew I wanted to put them into a larger piece of metal to make handling easier and safer. When you order two, they come packed in the same box, separated by a piece of plastic and cushioned in styrofoam. Getting a magnet pair separated was difficult, but doable. I knew that bringing two pairs together in a controlled manner would be very difficult. Knowing that these magnets will accelerate towards each other in an instant, I put one pair outside the cardboard they shipped in, placed a magazine inside the box for extra spacing and cushioning, and brought them together. As expected, they flew together. But I could not move them enough to get the magazine out or slide them to the edge of the cardboard. The attractive force was so great the cardboard was compressed to nothing. I ended up cutting around the magnet outline, through the cardboard and the magazine. I decided to put the magnets into a vice, gripping the two lower magnets only. It took 20 minutes to get them properly oriented in the vice. Sliding and twisting the magnets required the use of a crowbar and vice grips. Using the bench vice and large water pump pliers, I was able to get enough separation to slide a wooden shim between them. Using the shim, I was able to get all the paper out between the magnet pairs, then slide the shim out, thus bringing the magnets together in a controlled fashion. This took another hour! I brought the four magnets into the house to tinker. From 18 inches away, a 3" diameter ceramic magnet, with a couple small disc magnets attached, slammed into my new big magnet. All three ceramic magnets broke and chipped my new big magnet. I was pretty confident 18" was enough separation. There is a very nice set of smart phone apps written by Keuwlsoft. Go to the play store, search for Keuwlsoft, scroll down and look for the "Gauss Meter." It is free, but you get ads. They are not bad, but I always buy the apps because I want to reward the creative minds that create these tools. The app turns the magnetometer inside your smartphone into a Gauss meter, allowing you to measure and quantify the intensity of magnetic fields. This Gauss meter picks up my new big magnet from a few feet away. Bringing the phone closer, hits the 45 gauss limit of the meter. It affects compasses and other magnets at a similar distance, which is exactly what I want to demonstrate to my students. 45 Gauss is a lot! The earths magnetic field average 1/2 a Gauss. Since I do not want to ever separate these magnets, I decided to put them into a protective metal sleeve. I used a 3" long piece of 2" x 2" x 1/8th" piece of square tubing. It was my intention to center the magnets in the tube by driving wooden wedges into place. The magnets had other ideas, and simply getting them into the tube required a hydraulic press. Driving a wedge between the magnet and the wall of the tubing was not possible, so I settled for putting wedges down the two remaining sides. See the photo. This magnet will serve my classroom demonstrations very nicely. The price is reasonable, shipping was free with Prime, and the two-day shipping time was fantastic. I urge you to pursue reading on magnet safety. Have fun, enjoy these, and be safe! +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.......................................................................................................................................................................... +.3
Review: This magnet is extremely magnetic, nearly got my fingers pinched through the gloves when I was testing putting some tools on the magnet! Thankfully, I was wearing some thick gloves and prevented any bruising from happening from the pinch! I compared this to some fish magnets claiming to be "300 lbs" pull force and holy gawd this thing is even way stronger than that magnet! I suspect this might be because those fish magnets have a magnetic shield from their outer shell and the actual magnet is smaller than the shell itself. Anyway, this magnet is really thick even though it is small in your hands, this will literally crush fingers if not properly handled. A reminder when removing these 2 magnets apart though, do not let yourself be distracted after separating these 2 magnets apart. Once apart from each other put the one on the table far away from the one in your hand. If you do not do this it will fling itself to the other magnet and cause a powerful impact potentially breaking 1 or even both magnets, it may even pinch a finger! These types of magnets that are this powerful are known to be brittle and break easily if impacted by another magnet, so be in your best mind to follow precautions. Overall, this is a great magnet, helps me find screws, nails, and old tools that may be sticking out on the ground. Very useful and strong! Maybe sometimes too STRONG!

## Features

- This is a work tool, not a toy. Not for purchase under 18
- Super Strong Square Magnet Set of 2, 1.6 x 1.6 x 0.8 inches (40 x 40 x 20 mm)
- Suction Power: 132.2 lbs (60 kg) (per piece)
- Magnetization Direction, Thickness Direction (Strongest side is the largest)
- Grade N52

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B082WGD8XW |
| Batteries Included | No |
| Batteries Required? | No |
| Customer Reviews | 4.5 4.5 out of 5 stars (939) |
| Date First Available | December 26, 2019 |
| Item Dimensions LxWxH | 40 x 40 x 20 mm |
| Item Shape | Square |
| Item Weight | 449 g |
| Manufacturer | DIYMAG Store |
| Material | Neodymium |
| Number Of Pieces | 2 |
| Part number | F40x40x20 2P |
| Product Dimensions | 4 x 4 x 2 cm; 449 g |

## Product Details

- **Brand:** DIYMAG
- **Manufacturer:** DIYMAG Store
- **Material:** Neodymium
- **Number of Pieces:** 2
- **Shape:** Square

## Images

![40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets - Image 1](https://m.media-amazon.com/images/I/31c6t32MxTL.jpg)
![40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets - Image 2](https://m.media-amazon.com/images/I/41-uGZHgDpL.jpg)
![40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets - Image 3](https://m.media-amazon.com/images/I/41H4h2ferjL.jpg)
![40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets - Image 4](https://m.media-amazon.com/images/I/41LfYyiyP-L.jpg)
![40x40x20mm Super Strong Neodymium Block Magnet, Permanent Magnet, The World's Strongest and Most Powerful Rare Earth Magnets - Image 5](https://m.media-amazon.com/images/I/41uhTr4UiUL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by O***Y on April 25, 2024*

This is an interesting review because the number of stars for easy to remove and durability are both one. Normally, a one-star review is bad. But in this case, less starts is good news! Easy to remove would mean a weak magnet, and neodymium magnets are not durable. These are facts. The product advertisement on Amazon covers some of these points. But the question should have been "magnetic grip" and that would have been five stars. Complaining about a neodymium magnet being fragile is like saying an eggshell is fragile. It is the way it is. So, first off, you want powerful magnets? Order these. Good price, fast shipping, good product. You will get what you want. But there is more to the story. These are dangerous in even in experienced hands. I am experienced - and still had troubles. This is not the manufacturers or vendors fault. These are powerful magnets, and any difficulties are the responsibility of the user. Don't order these as toys. To avoid disappointment, you should know in advance exactly what you wish to do with these. I did know, and I had difficulties, because these magnets are so strong they are actually annoying!! I did not want multiple powerful magnets because of the need to avoid crashing magnets together which breaks them, creating sharp shards of metal, crushing fingers in the process. I knew I wanted a single magnet, to demonstrate the long distance effects of a powerful magnet. Other websites had what are probably better magnets at a similar price, but nobody could beat Amazon's shipping costs and time. So I bought four of these. They are shipped two to a small box, together, with a small spacer between them. I knew already I wanted these magnets stuck together into one big one. I knew I wanted to put them into a larger piece of metal to make handling easier and safer. When you order two, they come packed in the same box, separated by a piece of plastic and cushioned in styrofoam. Getting a magnet pair separated was difficult, but doable. I knew that bringing two pairs together in a controlled manner would be very difficult. Knowing that these magnets will accelerate towards each other in an instant, I put one pair outside the cardboard they shipped in, placed a magazine inside the box for extra spacing and cushioning, and brought them together. As expected, they flew together. But I could not move them enough to get the magazine out or slide them to the edge of the cardboard. The attractive force was so great the cardboard was compressed to nothing. I ended up cutting around the magnet outline, through the cardboard and the magazine. I decided to put the magnets into a vice, gripping the two lower magnets only. It took 20 minutes to get them properly oriented in the vice. Sliding and twisting the magnets required the use of a crowbar and vice grips. Using the bench vice and large water pump pliers, I was able to get enough separation to slide a wooden shim between them. Using the shim, I was able to get all the paper out between the magnet pairs, then slide the shim out, thus bringing the magnets together in a controlled fashion. This took another hour! I brought the four magnets into the house to tinker. From 18 inches away, a 3" diameter ceramic magnet, with a couple small disc magnets attached, slammed into my new big magnet. All three ceramic magnets broke and chipped my new big magnet. I was pretty confident 18" was enough separation. There is a very nice set of smart phone apps written by Keuwlsoft. Go to the play store, search for Keuwlsoft, scroll down and look for the "Gauss Meter." It is free, but you get ads. They are not bad, but I always buy the apps because I want to reward the creative minds that create these tools. The app turns the magnetometer inside your smartphone into a Gauss meter, allowing you to measure and quantify the intensity of magnetic fields. This Gauss meter picks up my new big magnet from a few feet away. Bringing the phone closer, hits the 45 gauss limit of the meter. It affects compasses and other magnets at a similar distance, which is exactly what I want to demonstrate to my students. 45 Gauss is a lot! The earths magnetic field average 1/2 a Gauss. Since I do not want to ever separate these magnets, I decided to put them into a protective metal sleeve. I used a 3" long piece of 2" x 2" x 1/8th" piece of square tubing. It was my intention to center the magnets in the tube by driving wooden wedges into place. The magnets had other ideas, and simply getting them into the tube required a hydraulic press. Driving a wedge between the magnet and the wall of the tubing was not possible, so I settled for putting wedges down the two remaining sides. See the photo. This magnet will serve my classroom demonstrations very nicely. The price is reasonable, shipping was free with Prime, and the two-day shipping time was fantastic. I urge you to pursue reading on magnet safety. Have fun, enjoy these, and be safe! +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.......................................................................................................................................................................... +.3

### ⭐⭐⭐⭐⭐ Review
*by A***I on November 19, 2024*

This magnet is extremely magnetic, nearly got my fingers pinched through the gloves when I was testing putting some tools on the magnet! Thankfully, I was wearing some thick gloves and prevented any bruising from happening from the pinch! I compared this to some fish magnets claiming to be "300 lbs" pull force and holy gawd this thing is even way stronger than that magnet! I suspect this might be because those fish magnets have a magnetic shield from their outer shell and the actual magnet is smaller than the shell itself. Anyway, this magnet is really thick even though it is small in your hands, this will literally crush fingers if not properly handled. A reminder when removing these 2 magnets apart though, do not let yourself be distracted after separating these 2 magnets apart. Once apart from each other put the one on the table far away from the one in your hand. If you do not do this it will fling itself to the other magnet and cause a powerful impact potentially breaking 1 or even both magnets, it may even pinch a finger! These types of magnets that are this powerful are known to be brittle and break easily if impacted by another magnet, so be in your best mind to follow precautions. Overall, this is a great magnet, helps me find screws, nails, and old tools that may be sticking out on the ground. Very useful and strong! Maybe sometimes too STRONG!

### ⭐⭐⭐⭐⭐ Review
*by A***Y on December 7, 2025*

Super strong be careful with your fingers. If they get stuck together it is nearly impossible to get apart.

## Frequently Bought Together

- DIYMAG 40x40x20mm Super Strong Neodymium Block Magnet Cubes N52 Permanent Magnet Disc
- LOVIMAG Super Strong Neodymium Disc Magnets, Powerful N52 Rare Earth Magnets - 1.26 inch x 1/8 inch, Pack of 12

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-05*