Company NameYueqing Dofo Spring Manufacturing Co., Ltd.
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About UsDOFO Spring Story

Our story began in 1998. Back then we are a small business ower of switch springs with a single production line in Liushi market of Yueqing. Mainly supply coal mining machine spring and switch springs.

As we stick to strict quality policy, our product had got a good reputation among the customers. Three years later, we was lucky to be in the supply chain of Chint Group.

Business Development

As the business going, we applied DOFO brand in 2005 and moved to Yueqing Economic Development Industrial Area. Because being part of large supply chain requires better management in the company.

The comapny builds a mature structure in management, design, production, testing and packing. For better competition worldwide, we acquire certification of ISO9001, TS16949, ISO140001, OHSAS18001, BV certification.

After 20s years development, our product range expand a lot. We manufacture all kinds of coil springs for various area, such as automotive parts, micro MCB, electrical cabinet, appliance, oil equipment, industrial machines, etc. The company is authorized Yueqing Famous Brand and green supplier of chint every year. DOFO Spring has been the top supplier in spring manufacturing for electrical apparatus.

Manufacturing Capacity

The company has 106 full time staff. Plant area is over 7000 square meters. The company has more than 200 pieces CNC coiling machines for different product line. Production capacity can reach 1 million pieces a month under full power. We can manufacture compression spring, extension spring, torsion spring, wire forms, disc spring, etc. Our technicians have over 15 years experience in spring manufacturing. They are sophisticated in different kinds of spring prototype. You can take a view at our company gallery to learn more.

Company Vision

Today we are privilleged to connect with thousands of customers everyday with precision coil springs in good reputation. Some of them are international company, such as Panasonic, Messey Ferguson, etc. DOFO strive for "world class green supplier", we welcome challenges and are relentless till we deliver solutions.
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NameMr. Justin Hu
Address No. 11 Jing Five Road, Yueqing Economic Development Area, Yueqing, Wenzhou.
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Products Details
Product Description

x750 DIN2093 standard size disc spring manufacturer in China

#1 ATTN: Read This Before Buying 

A. Due to the internet and computer display solutions. The actual products may differ from
the pictures. Please contact our salesmen for further assistance.
B. All the extension springs, compression springs, torsion springs, wire forms can be made in customized demands.
C. We appreciate Drawing-Guide Production, Please send us a spring drawing as possible as you can when you inquiry.
D. We appreciate your inquiries and you are welcome all the time!

For a better understanding of your demand, please learn the basics of compression spring manufacturing.

#2 Working Drawing of a Compression spring


#3 Different End Types of Helical Compression springs
There are basically four types of ends, closed & ground, closed & not ground ends, open & ground ends, and open & not ground ends. Below is a diagram for illustration. 


#4 Different Shapes and Applications of Helical Compression Spring
Compression springs are helical or spiral-like springs. They demonstrate an open-coiled design and react to axis forces to store and return energy. Manufacturers build compression springs into a variety of products, such as Automobile suspensions, Couches, Mattresses, Vending machines, Medical devices, Pacemakers, Pens, Hydraulic, Medical, Lawn equipment, Firearms, Marine industry, Underwater oil rig piping, Watches
Different products require different shapes to meet their demand. The below diagram covers the common shapes of compression springs, such as conical spring, barrel spring, variable pitch spring, straight coil spring(cylinder spring) which are the most common springs, etc.


#5 Available Coating Method
Due to the government's environment policy, all the coating materials are prior to RoHS standards. Please take RoHS standard coating as possible as you can.
Coating MethodCostDoes it Meet the RoHS requirement?Remark
UnplatedNoneYes 
Anti Rust OilLowestYes 
Black Oxide/OxideLowerYes 
Normal Zinc coatingnormalNo 
Trivalent Zinc coatingHighYesNormally 8~10μ thickness, 48 hours without white rust
Nickel PlatednormalYes 
ElectrophoresisHigherYes 
PaintingVery HighYesrequire a longer delivery time
Stainless steel WashingnormalYes 
Stainless Steel Electro-polishHighestYesThis coating cost more than the others

 
FAQ
DOFO Spring provides a win-win service. Below we list answers to some of the questions our customers frequently asked. For anything unsure, please contact us, and we will respond within 12 hours.

Q: Which kind of materials are available? Do they meet RoHS certification?
A: DoFo Spring is able to manufacture different spring types of compression springs, extension springs, torsion springs, wire forms with a large range of High-Grade Spring Steel - Carbon steel - Stainless steel - Music Wire, all comply to the RoHS standard. The wire diameter is available from 0.001 inches to 0.075 inches, which can meet the requirement of different applications. All the spring materials meet European RoHS certification.

Q: Do you support orders in small quantities or do you only accept large runs?
A: DoFo Spring manufactures large quantity springs, small quantity springs based on your demand.  We will work with you to choose the most effective solution.

Q: Does DOFO spring offer DESIGN OR initial ASSISTANCE ON SPRINGS?
A: Our engineers could help with the design with the drawing and advise to lower the production cost. Our engineer has years of experience in spring design. We could provide drawing format in CAD, 3D, and 2D design layouts as well as prototype development.

Q: What is the typical lead time for custom springs?
A: The lead time varies in custom springs. For compression springs, extension springs, torsion springs, wire forms in our mold range, we are able to deliver within 25 days. However, for some complex shapes of springs, the delivery time would be around 30~40 days.

Q: Do you charge custom spring samples?
A: We make the custom springs sample charge as a subscription of formal order. In other words, the sample charge could be refunded when we receive the order. However, if your sample requires an additional mold, we will charge it.

Q: If we order large quantity springs, will you house the springs, wire forms, and ship to us based on a required basis?
A: Our warehouse provides specific stock services for long-term business. You can make your shipment schedule on an annual, monthly basis. We will ship on a specific schedule.

Q: What payment term do we accept for spring orders?
A: We could accept payment terms based on T/T, L/C at sight, DP, Westunion.
 
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Mainly ProductsX750 DIN2093 Standard Size Disc Spring Manufacturer in China