Neodymium Block Magnets

High tolerance neodymium rare earth block, cube & square magnets, N42 grade

Guaranteed tolerances for repeatability with exceptional pricing.

Neodymium Block, Square, Cube Magnets

Where indicated, all our neodymium magnets are fully sintered & individually pressed to optimize uniformity of magnetic orientation & are manufactured according to National Magnetic Standards. This ensures that strength variation of +/- 5% between magnets is met both within batches & from batch to batch. You can be certain that our magnets will make your sensors, switches & latches work reliably & according to design.

Coatings

  1. Standard is Cu-Ni-Cu & meets 10 hour salt spray test.
  2. Optional: Epoxy, Parylene, Gold, & more.

Certifications

  1. Certificates of Compliance available on request.
  2. All magnets made in ISO9002 certified facility
  3. ROHS & MSDS certificates available.
Displaying 1 to 30 (of 30 products)
2.5x2.5x1mm Nd Square Magnets

2.5x2.5x1mm Nd Square Magnets

SKU: 44220-1
$0.28USD or lower Each
2.5x2.5x2.5mm Cube Magnets

2.5x2.5x2.5mm Cube Magnets

SKU: 44220-2.5
$0.23USD or lower Each
5x2.5x1mm Thin Nd Block Magnet

5x2.5x1mm Thin Nd Block Magnet

SKU: 44221-1
$0.37USD or lower Each
5x5x2.5mm NdFeB Square Magnets

5x5x2.5mm NdFeB Square Magnets

SKU: 44222-2.5
$0.45USD or lower Each
7.5x7.5x2.5mm Nd Square Magnet

7.5x7.5x2.5mm Nd Square Magnet

SKU: 44225-2.5
$0.46USD or lower Each
7.5x7.5x5mm Square Magnets

7.5x7.5x5mm Square Magnets

SKU: 44225-5
$0.78USD or lower Each
7.5x7.5x7.5mm Cube Magnets

7.5x7.5x7.5mm Cube Magnets

SKU: 44225-7.5
$0.93USD or lower Each
10x2.5x2.5mm Nd Block Magnet

10x2.5x2.5mm Nd Block Magnet

SKU: 44226-2.5
$0.31USD or lower Each
10x5x1mm Nd Rectangle Magnet

10x5x1mm Nd Rectangle Magnet

SKU: 44227-1
$0.35USD or lower Each
10x10x1mm NdFeB Square Magnet

10x10x1mm NdFeB Square Magnet

SKU: 44229-1
$0.69USD or lower Each
10x5x2.5mm Nd Block Magnet

10x5x2.5mm Nd Block Magnet

SKU: 44227-2.5
$0.76USD or lower Each
10x10x2.5mm Square Magnets

10x10x2.5mm Square Magnets

SKU: 44229-2.5
$1.10USD or lower Each
10x10x10mm NdFeB Cube Magnets

10x10x10mm NdFeB Cube Magnets

SKU: 44229-10
$2.05USD or lower Each
12.5x2.5x1mm Block Magnets

12.5x2.5x1mm Block Magnets

SKU: 44230-1
$0.24USD or lower Each
12.5x5x1mm Block Magnets

12.5x5x1mm Block Magnets

SKU: 44231-1
$0.46USD or lower Each
12.5x5x2.5mm Nd Block Magnet

12.5x5x2.5mm Nd Block Magnet

SKU: 44231-2.5
$0.73USD or lower Each
12.5x5x5mm Neo Block Magnet

12.5x5x5mm Neo Block Magnet

SKU: 44231-5
$1.24USD or lower Each
12.5x12.5x2.5mm Square Magnets

12.5x12.5x2.5mm Square Magnets

SKU: 44234-2.5
$1.09USD or lower Each
12.5x12.5x5mm Square Magnets

12.5x12.5x5mm Square Magnets

SKU: 44234-5
$1.61USD or lower Each
12.5x12.5x12.5mm Cube Magnets

12.5x12.5x12.5mm Cube Magnets

SKU: 44234-12.5
$3.49USD or lower Each
20x10x5mm Block Magnets

20x10x5mm Block Magnets

SKU: 44251-5
$1.79USD or lower Each
25x2.5x2.5mm Nd Block Magnet

25x2.5x2.5mm Nd Block Magnet

SKU: 44256-2.5
$0.69USD or lower Each
25x5x2.5mm NdFeb Slab Magnet

25x5x2.5mm NdFeb Slab Magnet

SKU: 44257-2.5
$2.32USD or lower Each
25x10x5mm NdFeB Block Magnet

25x10x5mm NdFeB Block Magnet

SKU: 44259-5
$4.10USD or lower Each
25x12.5x2.5mm Block Nd Magnet

25x12.5x2.5mm Block Nd Magnet

SKU: 44260-2.5
$1.87USD or lower Each
25x12.5x5mm Neo Block Magnet

25x12.5x5mm Neo Block Magnet

SKU: 44260-5
$3.16USD or lower Each
25x25x2.5mm Square Magnets

25x25x2.5mm Square Magnets

SKU: 44265-2.5
$3.55USD or lower Each
25x25x5mm NdFeb Square Magnet

25x25x5mm NdFeb Square Magnet

SKU: 44265-5
$6.12USD or lower Each
25x25x25mm Neo Cube Magnets

25x25x25mm Neo Cube Magnets

SKU: 44265-25
$24.94USD or lower Each
50x5x2.5mm Nd Block Magnet

50x5x2.5mm Nd Block Magnet

SKU: 44402-2.5
$1.30USD or lower Each
More Information

What Customers Say About our Neodymium Magnets

[Actual reviews done on Google Places]

Roman Teliszczuk: Purchased neodymium magnets for work. The quality, price, packaging and delivery were excellent. I highly recommend Indigo Instruments.

Mark Elliott: Great website especially the dimensional and polarity information. Magnets arrived quickly and were as expected. Used to replace weak door alarm sensor magnets.

Ron Bennett: Fantastic support and product. Beats Amazon price with real customer service. After online order was placed, they called and and asked if I had any questions and gave clear instructions on pickup process. Order was ready and in stock and the product was of the highest quality and exactly as described. Will buy other items from Indigo instruments.

Ian Kelly: I've dealt with Indigo Instruments for years now. They have always been personable and very knowledgeable. Most recently I sent them a hand-drawn sketch of my interpretation of something I saw on YouTube and wanted recommendations on what magnets to use. Chris called me up, discussed the project and made some recommendations. His recommendation was bang on. I couldn't be happier with the end product.

Tracy Myerson: Super fast shipping, excellent prices, and great quality product! I purchased N42 Neodymium magnets, they are the real deal. I had previously bought magnets on Amazon that were advertised as N52, they were just another cheap Chinese fake. These folks sell authentic, high quality stuff and get it to you fast. Highly recommended!

Brenda McIntyre: love these guys, high quality, quick service and reasonable pricing!!

Peter Maran: Been doing business with Indigo for many years. Their Neodymium magnets are superb in quality and price. Other items, tools, magnifiers, tweezers, and so on, all quality made withstanding the test of time.

Technical
Specifications for Fully Sintered/Pressed
Neodymium Magnets, N42 Grade
Remanent
Flux Density

(Br)
Coercivity
(bHc)
Intrinsic
Coercivity

(jHc)
Max.
Energy Product

(BHMax)
Curie
Temp.

(Tc)
Working
Temp.

(Tw)
Temp.
Coeff.

(αB)r
13,000G; 1300mT 12.0 Oe; 955 A/m 17.0 Oe; 1353 A/m 42 MGO; 334 kJ/m3 310oC 80oC -0.12%/Co

 

Specifications for Fully Sintered/Pressed
Neodymium Magnets, N42 Grade

RemanentFlux Density
(Br)
13,000G; 1300mT
Coercivity
(bHc)
12.0 Oe; 955 A/m
Intrinsic Coercivity
(jHc)
17.0 Oe; 1353 A/m
Max.Energy Product
(BHMax)
42 MGO; 334 kJ/m3
Curie Temperature
(Tc)
310oC
Working Temperature
(Tw)
80oC
Temp.Coefficient
(αB)r
-0.12%/Co

 

  • nickel-copper-nickel coated
  • size tolerance for dimensions <10mm: +/- 0.05mm
  • size tolerance for dimensions >10mm: +/- 0.1mm
  • size tolerance for dimensions >50mm: +/- 0.2mm
  • magnet strength variance piece to piece: ± 5%
  • axis of magnetization is perpendicular to page

 

This table is a summary of pull forces for all block magnets. It assumes complete saturation & no air gap. 

Field Strength (Gauss) & Pull Forces in Pounds & Kilograms at Surface/Centre of Magnet
SKU Size (mm) Gauss Pounds Kilograms
         
44220-1 2.5 × 2.5 × 1 3786.5 0.2 0.1
44220-2.5 2.5 × 2.5 × 2.5 5666.8 1.0 0.4
44221-1 5 × 2.5 × 1 3192.2 0.36 0.16
44222-1 5 × 5 × 1 2199.2 0.6 0.3
44222-2.5 5 × 5 × 2.5 4333.3 1.5 0.7
44222-5 5 × 5 × 5 5666.8 3.8 1.7
44225-1 7.5 × 7.5 × 1 1516.3 1.0 0.5
44225-2.5 7.5 × 7.5 × 2.5 3335.7 2.6 1.2
44225-5 7.5 × 7.5 × 5 4976.1 5.0 2.3
44225-7.5 7.5 × 7.5 × 7.5 5666.8 8.5 3.9
44226-2.5 10 × 2.5 × 2.5 4870.9 1.16 0.53
44227-1 10 × 5 × 1 1791.7 0.95 0.43
44227-2.5 10 × 5 × 2.5 3723 2.39 1.09
44227-5 10 × 5 × 5 5248.1 4.55 2.07
44229-1 10 × 10 × 1 1151.4 1.4 0.7
44229-2.5 10 × 10 × 2.5 2662.8 3.8 1.7
44229-5 10 × 10 × 5 4333.3 7.9 3.6
44229-10 10 × 10 × 10 5666.8 15.1 6.9
44230-1 12.5 × 2.5 × 1 2900.4 0.69 0.31
44230-2.5 12.5 × 2.5 × 2.5 4800.9 1.72 0.78
44231-1 12.5 × 5 × 1 1725.9 1.09 0.5
44231-2.5 12.5 × 5 × 2.5 3590.7 2.78 1.26
44231-5 12.5 × 5 × 5 5101.1 5.41 2.46
44234-1 12.5 × 12.5 × 1 926.5 1.9 0.9
44234-2.5 12.5 × 12.5 × 2.5 2199.2 5.2 2.3
44234-5 12.5 × 12.5 × 5 3786.5 11.1 5.0
44234-12.5 12.5 × 12.5 × 12.5 5666.8 23.6 10.7
44251-5 20 × 10 × 5 3723 13.2 6.0
44256-2.5 25 × 2.5 × 2.5 4692.6 2.78 1.26
44257-2.5 25 × 5 × 2.5 3380.8 4.46 2.03
44257-5 25 × 5 × 5 4800.9 9.31 4.23
44259-2.5 25 × 10 × 2.5 2105.4 6.88 3.13
44259-5 25 × 10 × 5 3590.7 14.9 6.77
44260-2.5 25 × 12.5 × 2.5 1791.7 7.65 3.48
44260-5 25 × 12.5 × 5 3192.2 17.15 7.8
44265-2.5 25 × 25 × 2.5 1151.4 10.9 5.0
44265-5 25 × 25 × 5 2199.2 25.2 11.4
44265-25 25 × 25 × 25 5666.8 94.5 42.9
44402-2.5 50 × 5 × 2.5 3320.8 6.88 3.13


Imperial/Metric Conversion Table

Inch Decimal mm Rounded
1/32" 0.031 0.8 1
3/32" 0.094 2.4 2.5
5/32" 0.156 4.0 4
1/16" 0.063 1.6 1.5
3/16" 0.188 4.8 5
2/10" 0.200 5.1 5
1/8" 0.125 3.2 3.75
1/4" 0.250 6.4 7.5
5/16" 0.313 7.9 7.5
3/8" 0.375 9.5 10
13/32" 0.406 10.3 10
1/2" 0.500 12.7 12.5
9/16" 0.563 14.3 15
5/8" 0.625 15.9 15
11/16" 0.688 17.5 17.5
3/4" 0.750 19.1 20
13/16" 0.813 20.6 20
7/8" 0.875 22.2 22.5
15/16" 0.938 23.8 25

 

Tolerances Sintered Rare Earth Magnets
 
  Dimensions Tolerances

Size:
Unfinished Surfaces:
Dimensions perpendicular to pressing (die formed)

Inches mm Inches mm
0 to 0.125 0 to 3 +/- 0.006 +/- 0.15
0.126 to 0.625 3 to 16 +/- 0.012 +/- 0.30
0.626 to 0.875 16 to 22 +/- 0.018 +/- 0.45
0.876 and Up 22 and Up +/- 2.5% +/- 2.5%

 

Instructions/Safety
  • Can damage computer gear & credit cards.
  • Handle with care. Magnets can snap together and break skin or a finger or shatter on impact.