Super Strong Ring Neodymium Magnet

• Application: Industrial Magnet
• Shape: Ring
• Grade: N33-N52 (M, H, Sh, Uh, Eh, Ah)
• Usage: Industrial Usage
• Composite: NdFeB Magnet
• Size: Customized Size
• Model NO.: Ring Neodymium Magnet
• Tolerance: 0.05mm ~ 0.1mm
• Density: 7.4-7.8g/cm3
• Certification: ISO9001, ISO14001 & RoHS
• Type: Permanent
• Delivery Time: 22-30 Days
• Packaging: Pallet/Air Carton/Express Packaging
• Plating/Coating: Nickel/Epoxy Resin/Zinc, etc.
• Magnetism Direction: Through The Thickness
• Transport Package: Pallet/Air Carton/Express Packaging
• Trademark: SYM Magnets
• Origin: Zhejiang, China
• Production Capacity: 2000000 Piece/Pieces Per Month

Product Description

Product Description

 

Ring neodymium magnets are used to make high end speakers, electric motors, magnetic levitation, magnetic jewelries and magnetic bearings, etc. It can be nickel/zinc plating, black epoxy resin coating, etc.

 

Magnet Shape	Ring Shape
Dimensions	OD10 x ID4 x 5mm thick
Magnet Material	NdFeB
Grade	N33-N52 (M, H, SH, UH, EH, AH)
Tolerance	0.05mm ~ 0.1mm
Plating/Coating	Nickel/Epoxy Resin/Zinc, etc.
Magnetism Direction	Through 5mm thickness
Country Of Origin	China

 

Technical Data

 

Size Information

As almost all the magnets are customized according to customers' requirement, below we list the maximum size and minimum size we can make for some typical shapes of magnets for your reference.

Magnets Shapes	Max. Size (mm)	Min. Size (mm)	Remarks
Block	240 x 100 x 50	2 x 2 x 1	Optional customized countersunk boreholes
Cylinder/Disc	D240 x 50	D2 x 1
Ring	OD240 x 50 (ID customized)	D5 x 1 x 1
Arc/Tile	Customized

 

Some ring neodymium magnets sizes we made in the chart below for your reference.

Ring Magnet Ø6/2mm, Height 2mm, Neodymium, N45, Gold Plated

Ring Magnet Ø6/2mm, Height 2mm, Neodymium, N45, Nickel Plated

Ring Magnet Ø8/2mm, Height 6mm, Neodymium, N50, Nickel Plated

Ring Magnet Ø9/7mm, Height 11mm, Neodymium, N50, Nickel Plated

Ring Magnet Ø10/4mm, Height 5mm, Neodymium, N42, Gold Plated

Ring Magnet Ø10/4mm, Height 5mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø10/4mm, Height 10mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø10/4mm, Height 15mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø10/5mm, Height 5mm, Neodymium, N45, Nickel Plated

Ring Magnet Ø10/7mm, Height 3mm, Neodymium, N45, Nickel Plated, Diametrically Magnetised

Ring Magnet Ø12/5mm, Height 12mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø12/9mm, Height 1.5mm, Neodymium, N45, Nickel Plated

Ring Magnet Ø15/6mm, Height 6mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø19.1/9.5mm, Height 6.4mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø20/4.2mm, Height 5mm, Neodymium, N45, Nickel Plated

Ring Magnet Ø25/4.2mm, Height 5mm, Neodymium, N45, Nickel Plated

Ring Magnet Ø26.75/16mm, Height 5mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø40/23mm, Height 6mm, Neodymium, N42, Nickel Plated

Ring Magnet Ø60/6mm, Height 30mm, Neodymium, N45, Nickel Plated

N52 1/2" OD x 1/4" ID x 1/8" Neodymium Rare Earth Ring

N52 1/2" OD x 1/8" ID x 1/2" Neodymium Rare Earth Ring

Neodymium Ring Magnet N52 OD2"x ID 1/4"x1"

1/8" OD x 1/16" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N42

1/8" OD x 1/16" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1/8" OD x 1/16" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N52

3/16" OD x 1/16" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N35

3/16" OD x 1/16" ID x 3/16" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

1/4" OD x 1/16" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1/4" OD x 1/16" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1/4" OD x 1/16" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N52

1/4" OD x 1/8" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N42

1/4" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1/4" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N52

1/4" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1/4" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N42

1/4" OD x 1/8" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N48M

3/8" OD x 3/32" ID x 3/8" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N35

3/8" OD x 1/8" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N45

3/8" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N45

3/8" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N48M

3/8" OD x 3/16" ID x 3/8" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1/2" OD x 1/8" ID x 1/32" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1/2" OD x 1/8" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1/2" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1/2" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N52

1/2" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42

1/2" OD x 1/8" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1/2" OD x 1/8" ID x 1/2" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N35

1/2" OD x 3/16" ID x 1/4" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N42SH

1/2" OD x 1/4" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1/2" OD x 1/4" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1/2" OD x 1/4" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N52

1/2" OD x 1/4" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N40H

1/2" OD x 1/4" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N52

1/2" OD x 1/4" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1/2" OD x 1/4" ID x 1" Thick, Nickel Plated, Ring Neodymium Magnet, N35

5/8" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N48M

5/8" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N45

5/8" OD x 1/8" ID x 5/8" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N35

3/4" OD x 1/8" ID x 1/16" Thick, Nickel Plated, Ring Neodymium Magnet, N42

3/4" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N42

3/4" OD x 1/4" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

3/4" OD x 1/4" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N52

3/4" OD x 1/4" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N45

3/4" OD x 1/4" ID x 3/4" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N45

3/4" OD x 1/4" ID x 3/4" Thick, Nickel Plated, Ring Neodymium Magnet, N48M

3/4" OD x 3/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N42

3/4" OD x 1/2" ID x 3/8" Thick, Nickel Plated, Ring Neodymium Magnet, N42

7/8" OD x 1/4" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

1" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N42

1" OD x 3/16" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1" OD x 1/4" ID x 1" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1" OD x 1/4" ID x 1" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N42

1" OD x 5/16" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1" OD x 5/16" ID x 1/4" Thick, Epoxy Coated, Ring Neodymium Magnet, N45

1" OD x 5/16" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1" OD x 3/8" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N35

1" OD x 1/2" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1" OD x 1/2" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1" OD x 1/2" ID x 1" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

1 1/4" OD x 1/8" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42

1 1/4" OD x 3/4" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1 1/2" OD x 1/8" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N42

1 1/2" OD x 1/8" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1 1/2" OD x 1/4" ID x 1 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1 1/2" OD x 1/4" ID x 1 1/2" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N35

1 1/2" OD x 3/8" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

1 1/2" OD x 1/2" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

1 1/2" OD x 3/4" ID x 1/8" Thick, Nickel Plated, Ring Neodymium Magnet, N48H

1 1/2" OD x 3/4" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N40H

1 1/2" OD x 3/4" ID x 3/4" Thick, Nickel Plated, Ring Neodymium Magnet, N45

1 3/4" OD x 1/4" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

1 3/4" OD x 1/2" ID x 1/2" Thick, Nickel Plated, Ring Neodymium Magnet, N48M

2" OD x 1/4" ID x 3/8" Thick, Nickel Plated, Ring Neodymium Magnet, N45

2" OD x 1/4" ID x 1" Thick, Nickel Plated, Ring Neodymium Magnet, N45

2" OD x 1/4" ID x 2" Thick, Nickel Plated, Ring Neodymium Magnet, N35

2" OD x 1/4" ID x 2" Thick, Nickel Plated, Diametrically Magnetized, Ring Neodymium Magnet, N48H

2" OD x 1/2" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42SH

2" OD x 1" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N42

3" OD x 1/4" ID x 1/2" Thick, Nickel Plated, Axially Magnetized , Ring Neodymium Magnet, N35

3" OD x 1 1/2" ID x 1/4" Thick, Nickel Plated, Ring Neodymium Magnet, N45

3" OD x 2" ID x 1" Thick, Nickel Plated, Ring Neodymium Magnet, N35

Neodymium Magnets Production Process

Neodymium Magnets Performance Datasheet

Neodymium Magnets Magnetization Directions

Neodymium Magnets Surface Treatment

Surface Treatment	Process	Thickness	Color	SST	PCT
		(μm)		(Hours)	(Hours)
Nickel	Ni	10 ~ 20	Bright Silver	> 24 ~ 72	> 24 ~ 72
	Ni+Cu+Ni
Black Nickel	Ni+Cu+Ni	10 ~ 20	Bright Black	> 48 ~ 96	> 48
Cr3+Zinc	Zn	5 ~ 8	Bright Blue	> 16 ~ 48	---
	Cr3+Zn		Shining Color	> 36 ~ 72
Sn	Ni+Cu+Ni+Sn	10 ~ 25	Silver	> 36 ~ 72	> 48
Au	Ni+Cu+Ni+Au	10 ~ 15	Gold	> 12	> 48
Ag	Ni+Cu+Ni+Ag	10 ~ 15	Silver	> 12	> 48
Epoxy	Epoxy	10 ~ 20	Black/ Grey	> 96	---
	Ni+Cu+Epoxy	15 ~ 30		> 120	---
	Zn+Epoxy	15 ~ 25		> 120	---
Passivation	---	1 ~ 3	Dark Grey	Temporary Protection	---
Phosphate	---	1 ~ 3	Dark Grey	Temporary Protection	---

Remarks:
1. The SST results differ from coating. In general, Salt Spray Test result for the magnets with barrel plating (normally for small size of magnets), is better than the ones with rack plating (normally for big size of magnets).
2. Salt Spray Test (SST) condition: 5% NaCl, 35°C, continuously spray a certain time, test whether there is corrosion on plating/coating surface.
3. Pressure Cooking Test (PCT) condition: 2 atm, 95% RH (Relative Humidity), 121°C to test the plating/coating adhesion. (Zinc, Passivated/Phosphated, and Epoxy not suitable for PCT).
4. Other test methods for plating/coating: Drop Test, Cross Cut Test, Heating and Spilling Test, Constant Temperature, Humidity Test, etc. 

 

Physical Properties of Neodymium Magnets

Curie Temperature (°C)	310~380
Maximum Working Temperature (°C)	80~230
Electrical Resistivity (µ.cm)	110~170
Hardness (Hv)	560~580
Density (g/cm3)	7.4~7.8
Relative Recoil Permeability (µrec)	1.05
Saturation Field Strength (kOe/kA/m)	(30-40)/(2,400-3,200)
Temp. Coefficient of Br (T.C.α (Br)) (%/°C)	-0.12 ~ -0.10
Temp. Coefficient of Hcj (T.C.β (Hcj)) (%/°C)	-0.6

 

Packing & Shipping

 

Packing - Inner Packaging

- Standard Air and Express Packaging

- Standard Sea Packaging

Shipping

-When the gross weight is below 50kgs, we recommend to send it after packed in magnetism shielded cartons by express. 

-When the gross weight is between 50-100kgs, it can be sent by express or air. 

-When the gross weight is over 100kgs, we recommend to ship it by sea. 

Remarks: We have good contract prices with FedEx, DHL, UPS and TNT. Of course you can choose freight collect with your international courier's account no. For air and sea shipping, we have an experienced logistics team to handle the delivery and our own forwarders that we have been cooperating with for many years. If you would like to ask your forwarder to deal with the delivery, it is also okay with us.

 

Company Introduction

 

Hangzhou Shengyuan Machinery Co., Ltd. is specialized in manufacturing permanent magnets and magnetic assemblies. Our main products include neodymium magnets, SmCo magnets, AlNiCo magnets, ferrite magnets, pot magnets, magnetic hooks, fishing magnets, magnetic lifters, magnetic rods & grates, magnetic pushpins, magnetic tool holders and magnetic chucks, etc. We have a professional R&D team with plenty expertise and a sales team with rich experience in overseas business. Furthermore, all our products are manufactured with advanced equipment and strict QC procedures in order to ensure high quality. Our company's core value is "Building A Good Reputation With Quality Products And Excellent Service". 

With the advanced management concepts and experienced team, we have exported our products to many countries and regions all over the world, especially to North America and Europe. Our products enjoy a good reputation among our customers. 

We welcome customers, business associations and friends from all parts of the world to contact us and seek cooperation for mutual benefits. 

 

CONTACT US 

Add: No. 200, Jianshe 1st Rd., Xiaoshan Economic & Technological Development Zone, Hangzhou City, Zhejiang Province, 311200 China.   
 

 

 

Why Choose Us

 

1. Factory direct price makes our customers more competitive in the market. 

2. OEM and customization is welcome.
3. Quick response to customers.
4. Professional R&D team with extensive expertise in the area of magnets and magnetic assembies . Most of our engineers at least have 10 years experience.
5. Advanced production and inspection equipment.
6. Strict quality control system. ISO9001:2015 and RoHS
7. Experienced logistics team to deal with FOB, CIF and DDU terms. 

 

FAQ

 

-What information should I provide in my inquiry?

1. Maximum working temperature.  

2. Magnet's grade or magnetic flux density at the center.
3. Magnet dimensions and tolerance.
4. Any surface treatment on the magnet?
5. Order quantity.
6. Any special requirements for the packaging and transportation?

 

-How soon can I expect to get your reply?
Normally you can receive our reply within 1 hour during our work time 08:00 - 18:00(UTC-8).

 

-How will you ship the samples to me?

We will use international express such as FedEx, DHL, UPS and TNT. We have a good contract price with them.

 

-What is the normal delivery time for the customized magnet's order?

The normal delivery time is about 20 days.

 

-How about the payment methods?

We accept T/T, PayPal, Western Union and L/C