Audited Supplier
D18 x 3/4/5/10 - d4 mm
Industrial Magnet
Disc
N33-N52 (M, H, Sh, Uh, Eh, Ah)
Industrial Usage
NdFeB Magnet
D18 X 3/4/5/10 - D4 mm
0.05mm ~ 0.1mm
7.4-7.8g/cm3
ISO9001, ISO14001 & RoHS
Permanent
22-30 Days
Pallet/Air Carton/Express Packaging
Nickel/Epoxy Resin/Zinc, etc.
Through Thickness
SYM Magnets
Pallet/Air Carton/Express Packaging
Zhejiang, China
8505111000
Product Description
Disc neodymium magnet 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 Name | D18 x 3/4/5/10 mm Thick With d4 mm Strong Countersunk Disc Neodymium Magnets In Stock |
Magnet Shape | Countersunk Disc Shape |
Dimensions | D18 x 3/4/5/10 - d4 mm |
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 thickness |
Country Of Origin | China |
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.
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 |
- 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.
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.
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.
CONTACT 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.
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.
-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?
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).
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
