OEM High Precision Constant Force Spiral Wound Torsion Spring

• Customization: Available
• Function: Pressed, Buffer
• Material: Steel
• Model NO.: DF2202055
• Usage: Industrial, Auto, Motorcycle, Home Appliance
• Load Type: Torsion
• Production Process: Cold Roll
• Shape: Coil
• Product Name: Force Spiral Spring
• 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: Customized Shapes Available
• Surface Treatment: Black Oxide
• 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: customized
• Trademark: DOFO
• Origin: Wenzhou, China
• HS Code: 7320909000
• Production Capacity: 1, 000, 000 Pieces Per Month

Product Description

Product Description

OEM high precision constant force spiral wound torsion spring

#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 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

 

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.

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.
 

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