High Quality Custom Tempering Steel Torsional Coil Springs Factory
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Product Highlights
- RoHS Compliant Materials: All springs made from high-grade steel comply with RoHS standards for environmental safety.
- Custom Design Support: Engineers provide CAD/3D design assistance and prototype development to lower production costs.
- Flexible Order Quantities: We accept both small quantity and large run orders based on your specific demand.
- Sample Charge Refund: Custom sample charges are refunded upon placement of the formal order.
- Fast Lead Time: Standard springs delivered within 25 days; complex shapes take 30-40 days.
- Multiple Coating Options: Offers Zinc, Nickel, Black Oxide, and Stainless Steel coatings meeting various standards.
- ISO Certified Quality: Certified by ISO9001, SGS, RoHS, CE, and Ts16949 for consistent quality assurance.
- Wide Material Range: Available in Carbon Steel, Stainless Steel, and Music Wire with diameters 0.001-0.075 inches.
Product Attributes
- Customization
- Available
- Function
- Pressed, Buffer
- Material
- Steel
- Model NO.
- DF2204002
- Usage
- Industrial, Auto, Motorcycle, Home Appliance
- Load Type
- Torsion
- Production Process
- Cold Roll
- Shape
- Coil
- Product Name
- Spring Tempering
- Business Mode
- Factory OEM
- Material Standard
- GB 4357-09 or Equivalent
- Wire Range
- From Min 0.1mm(0.004inch) to Max 12mm(0.48inch)
- Winding Direction
- Left and Right
- End Type
- Two Direction
- Surface Treatment
- Zinc Coating
- Coating Thickness
- 8~10 Micrometer
- Testing Method
- Random Sample Inspection
- Tolerance
- GB Standard, Grade II or as Per Your Requirement
- Spring Rate Tolerance
- +-3%~10%
- Aql Level
- Aql 1.0
- Packing Method
- OPP Bags with Blank Carton
- Normal Carton Size
- 23X23X31/Cm with No Mark
- Certificate
- ISO9001, SGS, RoHS, CE, Ts16949
- Transport Package
- Carton and Outer Wooden Case
- Specification
- 8x10x44mm
- Trademark
- DOFO
- Origin
- Wenzhou, China
- HS Code
- 7320909000
- Production Capacity
- 1, 000, 000 Pieces Per Month
- Package Size
- 1.00cm * 1.00cm * 1.00cm
- Package Gross Weight
- 1.000kg
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
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High Quality Custom Tempering Steel Torsional Coil Springs Factory -
High Quality Custom Tempering Steel Torsional Coil Springs Factory -
High Quality Custom Tempering Steel Torsional Coil Springs Factory -
High Quality Custom Tempering Steel Torsional Coil Springs Factory -
High Quality Custom Tempering Steel Torsional Coil Springs Factory -
High Quality Custom Tempering Steel Torsional Coil Springs Factory -
High Quality Custom Tempering Steel Torsional Coil Springs Factory
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Product Description
high quality custom tempering steel torsional coil springs factory
DOFO spring is a leading manufacturer of single & double torsion springs which can be found in clothespins, window shades & more.
#1 ATTN: Read This Before BuyingA. 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 torsion spring manufacturing.
#2 Working Drawing of a torsion spring
#3 Different Shapes of Helical Torsion Springs
There are generally two common types of torsion springs: single and double coil torsion springs. Double torsion springs are two single torsion springs connected. They work together to double the torque that a single spring would produce.
#4 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. Below is a table for reference, you can simply learn the cost of each coating method.
| Coating Method | Cost | Does it Meet the RoHS requirement? | Remark |
| Unplated | None | Yes | |
| Anti Rust Oil | Lowest | Yes | |
| Black Oxide/Oxide | Lower | Yes | |
| Normal Zinc coating | normal | No | |
| Trivalent Zinc coating | High | Yes | Normally 8~10μ thickness, 48 hours without white rust |
| Nickel Plated | normal | Yes | |
| Electrophoresis | Higher | Yes | |
| Painting | Very High | Yes | require a longer delivery time |
| Stainless steel Washing | normal | Yes | |
| Stainless Steel Electro-polish | Highest | Yes | This coating cost more than the others |
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.
Q: Do you support orders in small quantity 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 service OR initial ASSISTANCE ON SPRINGS?
A: Our engineers could give initial assistance on the design 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 layout 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 service 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.
If any question, please contact us directly.
About the Supplier
This supplier has been audited by SGS. Verify the report on the official SGS website with ID "QIP-ASR253661". Items marked "
" are certified.
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Company Profile
DOFO 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.
About Our Factory & Business Background
-
Business Type
- Manufacturer/Factory & Trading Company
- Address
- No. 11 Jing Five Road, Yueqing Economic Development Area, Yueqing, Wenzhou, Zhejiang, China
-
Plant Area
- 7013 square meters
-
Number of Employees
- 97
-
Registered Capital
- 15,000,000 RMB
-
Terms of Payment
- LC, T/T, D/P, PayPal, Western Union, Small-amount payment
-
International Commercial Terms(Incoterms)
- CIF, FOB, CFR, EXW
-
Average Lead Time
-
Peak Season Lead Time: one month
Off Season Lead Time: one month -
Nearest Port
- Ningbo Port
-
Minimum Order Quantity
- 5000 Pcs
-
Supply Chain Partners
- 20
Our Production Capability & Technical Expertise
-
Main Products
- Compression Spring, Extension Spring, Automotive Parts Spring, Torsion Spring, Stainless Steel Spring, Trampoline Spring, Alloy Steel Spring, Switch Spring, Mining Machine Spring, Disc Spring
-
Production Lines
- 7
-
Production Machines
- Spring manufacturing machine, Punching machine, Grinding machine, Heat treatment equipment
-
QA/QC inspectors
- 8 people
-
Inspection Type for Finished Products
- 100% inspection(Visual inspection & Function inspection)
-
Inspection Method for Finished Products
- Have instructions and uniformly followed
-
Customization Options
- Customization from Samples, Customization from Designs, Full Customization, Minor Customization, Flexible customization
-
ODM Service Available
- Yes
-
R&D Engineers
- 2 people
-
Traceability of Raw Materials
- Yes
Our Industry Experience & Global Business Record
-
Year of Establishment
- 1999-05-27
-
Export Year
- 26 Years
-
Main Markets
- Southeast Asia/ Mideast, Australia
-
Repeat Buyers Choice
- 50%~80%
-
Number of Foreign Trading Staff
- 1
-
Overseas Agent/Branch
- No
-
New Products Launched in Last year
- Yes
Our Certifications, Standards & Industry Recognition
-
Cooperated with Fortune 500
- No
FAQ
- Which materials are available and do they meet RoHS certification?
- We manufacture springs using High-Grade Spring Steel, Carbon Steel, Stainless Steel, and Music Wire. All materials comply with the RoHS standard.
- Do you support small quantity orders?
- Yes, we manufacture both large quantity and small quantity springs based on your demand and will help choose the most effective solution.
- Does DOFO offer design service or initial assistance?
- Our engineers provide initial design assistance to lower costs and offer CAD, 3D, and 2D design layouts as well as prototype development.
- What is the typical lead time for custom springs?
- For springs in our mold range, delivery is within 25 days. For complex shapes, the delivery time is around 30-40 days.
- Do you charge for custom spring samples?
- Sample charges are refunded when we receive the formal order. However, additional molds required for samples will be charged separately.
- Do you provide warehousing and shipping services for large orders?
- Yes, our warehouse provides stock services for long-term business, allowing you to schedule shipments annually or monthly.
- What payment terms do you accept?
- We accept T/T, L/C at sight, DP, Western Union, and PayPal.
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