Super Strong Countersunk Disc Neodymium Magnet

• Customization: Available
• Application: Industrial Magnet
• Shape: Countersunk Disc
• Model NO.: Countersunk Disc Neodymium Magnet
• Grade: N33-N52 (M, H, Sh, Uh, Eh, Ah)
• Usage: Industrial Usage
• Composite: NdFeB Magnet
• Size: Customized Size
• 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
• HS Code: 8505111000
• Production Capacity: 2000000 Pieces Per Month

Product Description

Product Description

 

Disc neodymium magnet D15 x4 mm with a countersunk borehole can be fastened with a countersunk head screw to hang up signs, tools, etc., especially well-suited for carpentry, metal kitchen utensils, exhibition stand construction, shopfitting, signage technology, etc.

 

Magnet Shape	Countersunk Disc Shape
Dimensions	Customized dimensions (check the size information below)
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 the 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 countersunk disc neodymium magnets sizes we made in the chart below for your reference.

Disc magnet ø15mm, height 4mm, with countersunk borehole

Disc magnet ø18mm, height 4mm, with countersunk borehole

Disc magnet ø23mm, height 4mm, with countersunk borehole

Disc magnet ø27mm, height 4mm, with countersunk borehole

Disc magnet ø34mm, height 4mm, with countersunk borehole

Disc magnet ø42mm, height 4mm, with countersunk borehole

Disc magnet ø50mm, height 4mm, with countersunk borehole

Countersunk neodymium disc magnet OD1/2" x 3/8" thick, with #6 countersunk hole on both sides

Neodymium disc magnet OD5/8"x1/8" thick with #6 countersink

Countersunk neodymium disc magnet OD5/8" x 3/16" thick with #6 countersunk hole

Disc neodymium magnet OD5/8"x1/4" thick, with #6 countersink

OD3/4"x1/8" thick neodymium rare earth disc magnet with #8 countersink

OD3/4"x1/4" thick neodymium rare earth disc magnet with #6 countersink on both sides

OD3/4"x1/4" thick neodymium rare earth disc magnet with #8 countersink

Neodymium rare earth disc magnet OD32mm x 6.4mm thick with #10 countersink

Disc magnet ø15mm, height 4mm, with countersunk borehole

Disc magnet ø18mm, height 4mm, with countersunk borehole

Disc magnet ø23mm, height 4mm, with countersunk borehole

Disc magnet ø27mm, height 4mm, with countersunk borehole

Disc magnet ø34mm, height 4mm, with countersunk borehole

Disc magnet ø42mm, height 4mm, with countersunk borehole

Disc magnet ø50mm, height 4mm, with countersunk borehole

OD25 x 20 thick x ID6mm hole ultra high performance neodymium magnet

Disc neodymium magnet 1/4" OD x 1/8" thick with countersunk hole for #2 screw, nickel plated

Disc neodymium magnet 3/8" OD x 1/8" thick with countersunk hole for #4 screw, nickel plated

Disc neodymium magnet 1/2" OD x 1/8" thick with countersunk hole for #4 screw, nickel plated

Disc neodymium magnet 5/8" OD x 1/8" thick with countersunk hole for #6 screw, nickel plated

Disc neodymium magnet 3/4" OD x 1/8" thick with countersunk hole for #8 screw, nickel plated

Disc neodymium magnet 7/8" OD x 1/8" thick with countersunk hole for #8 screw, nickel plated

Disc neodymium magnet 1" OD x 3/16" thick, countersunk hole for #10 countersunk screw, nickel plated

Disc neodymium magnet 1" OD x 0.194" ID x 0.349" ID x 1/4" thick, with double countersunk hole for #6 screws

Disc neodymium magnet 1 1/4" OD x 0.194" ID x 0.349" ID x 1/4" thick, with double countersunk hole for a #8 screw

Disc neodymium magnet 1 1/4" OD x 0.221" ID x 0.402" ID x 3/8" thick, with double countersunk hole for #10 screws

Disc neodymium magnet 1 1/2" OD x 0.221" ID x 0.402" ID x 3/8" thick, with double countersunk hole for a #10 screw

Disc neodymium magnet 2" OD x 0.281" ID x 0.527" ID x 1/2" thick, with double countersunk hole for a 1/4"-20 screw

 

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. 

 

Add.: No. 66, Leda 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