If we order large quantity springs, will you house the springs and ship to us based on a required basis?

Yes, our warehouse provides specific stock service for long-term business. You can schedule shipments on an annual or monthly basis, and we will ship according to your specific schedule.

What payment terms do we accept for spring orders?

We accept payment terms including T/T, L/C at sight, DP, Western Union, and PayPal.

ISO9001 Factory OEM High Quality Different Types Helical Extension Spring

Name: ISO9001 Factory OEM High Quality Different Types Helical Extension Spring
Brand: Yueqing Dofo Spring Manufacturing Co., Ltd.
SKU: 944733515

Zhejiang, ChinaYueqing Dofo Spring Manufacturing Co., Ltd.

US$0.20-1.00

10,000 Pieces

Sample price:US$80.00/piece.Request sample

Product profile

Customization

Available

Function

Pressed, Buffer

Material

Steel

Model NO.

DF2012074

Usage

Industrial, Auto, Motorcycle, Home Appliance

Load Type

Extension

Production Process

Cold Roll

Shape

Coil

Product Name

Helical Extension 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

as Per Your Request

End Type

Different Hooks Available

Surface Treatment

Trivalent 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

customized

Trademark

DOFO

Origin

Wenzhou, China

HS Code

7320909000

Production Capacity

1, 000, 000 Pieces Per Month

Key features

RoHS Compliant Coatings: All coating materials meet RoHS standards, including Trivalent Zinc and Nickel Plating.

Custom Design Assistance: Engineers provide initial design assistance, CAD/3D drawings, and prototype development.

Flexible Order Quantities: Supports both small quantity and large run orders based on customer demand.

Sample Charge Refund: Custom spring sample charges are refunded upon receipt of the formal order.

ISO9001 Certified Factory: Factory holds ISO9001, SGS, RoHS, CE, and Ts16949 certifications for quality assurance.

Wide Material Range: Manufactures springs from Carbon Steel, Stainless Steel, and Music Wire (0.001-0.075 inches).

Fast Lead Time: Standard custom springs delivered within 25 days; complex shapes take 30-40 days.

Diverse Hook End Types: Offers various hook ends like machine loop, crossover loop, and teardrop shapes.

Company profile

High Repeat Buyers ChoiceIn-stock Capacity100% Finished Products InspectionQuality Assurance

Yueqing Dofo Spring Manufacturing Co., Ltd.

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 26 Years CertifiedNearest Port: Ningbo PortAverage Response Time: ≤4.45h

AI-Powered supplier vetting

SummaryThe supplier presents itself as a professional technical supplier with 3D design, R&D, ODM, and broad customization capabilities. It reports structured production, testing, packing, quality-control, traceability, corrective-action, and complaint-handling procedures, as well as valid contracts with associated subcontractors and inventory capability. Export experience is stated at 26 years, with self-operated import/export rights and 21%–30% of sales from exports. However, it has no overseas warehouse, showroom, agents, or branches, and reports no offline trade-show participation. Certification holdings are explicitly described in the company profile, but current validity is not independently established. Financial credibility cannot be assessed because the supplied financial fields contain zero values. Customer cases and named customer references are not provided.

Supplier typeThe supplier is explicitly identified as a professional technical supplier and describes a mature structure covering management, design, production, testing, and packing. It also has valid manufacturing contracts with associated subcontractors and self-operated import/export rights, supporting classification as a manufacturing-oriented technical supplier.

CertificationsThe company description states that it obtained ISO9001, TS16949, ISO14001, OHSAS18001, and BV certification. The slice does not provide certificate numbers, validity dates, or verification records, so the assessment is based on the supplier’s stated holdings.

After-Sales capabilityThe supplier reports clear procedures and followed records for corrective and preventive actions and customer complaints, plus quality assurance and material traceability. However, it has no overseas agents or branches, overseas warehouse, or showroom, which limits local service infrastructure.

R&D capabilityThe supplier reports R&D capability, new products in the past year, 3D software design services, and ODM services. It does not have an available SDK and does not provide OEM services for popular brands, but those limitations do not negate the stated product-development capabilities.

Production capacityEvidence includes valid contracts with every associated subcontractor, inventory capability, one-month average lead times in both peak and off-seasons, 20 qualified service-capability suppliers, standardized finished-product inspection instructions, and established production and testing structures. The supplier also reports 26 years of export experience and self-operated import/export rights.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization, together with 3D design and ODM services. This indicates broad design-to-production customization coverage.

Product Q&A

Q:Which materials are available and do they meet RoHS certification?

DoFo Spring manufactures compression, extension, torsion springs, and wire forms using High-Grade Spring Steel, Carbon steel, Stainless steel, and Music Wire. All materials comply with the RoHS standard. Wire diameter ranges from 0.001 to 0.075 inches.

Q:Do you support small quantity orders or only large runs?

We support both small quantity and large run orders based on your specific demand. We work with you to choose the most effective solution for your production needs.

Q:Does DOFO spring offer DESIGN service or initial ASSISTANCE ON SPRINGS?

Yes, our engineers provide initial design assistance to help lower production costs. We offer drawing formats in CAD, 3D, and 2D design layouts, as well as prototype development services.

Q:What is the typical lead time for custom springs?

Lead times vary. For standard custom springs within our mold range (compression, extension, torsion, wire forms), delivery is within 25 days. Complex shapes may take 30-40 days.

Q:Do you charge custom spring samples?

We charge for custom spring samples, but this charge is refunded when you place a formal order. If the sample requires an additional mold, we will charge for the mold separately.