Do you offer stock services for large quantity orders?

Yes, we provide specific stock service for long-term business, allowing you to schedule shipments on an annual or monthly basis.

What payment terms do you accept?

We accept T/T, L/C at sight, DP, PayPal, Western Union, and Small-amount payment.

Music Wire Tower Bolt Door Lock Spring

Name: Music Wire Tower Bolt Door Lock Spring
Brand: Yueqing Dofo Spring Manufacturing Co., Ltd.
SKU: 946452685

Zhejiang, ChinaYueqing Dofo Spring Manufacturing Co., Ltd.

US$0.10-1.00

10,000 Pieces

Sample price:US$80.00/piece.Request sample

Product profile

Customization

Available

Function

Pressed, Buffer

Material

Steel

Model NO.

DF2012267

Usage

Industrial, Auto, Motorcycle

Load Type

Compression

Production Process

Cold Roll

Shape

Coil

Product Name

Door Lock Spring

Business Mode

Factory OEM Service

Material Standard

GB 4357-09 or Equivalent

Winding Direction

Right Winding

End Type

Close and Ground

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

Aql1.0

Certificate

ISO9001, SGS, RoHS, CE

Normal Carton Size

23X23X31/Cm with No Mark

Transport Package

OPP Bags with Blank 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 Materials: All spring materials including carbon steel and stainless steel comply with European RoHS certification.

Custom Design Support: Engineers provide CAD, 3D, and 2D design layouts and prototype development to lower production costs.

Flexible Order Quantities: We manufacture both large quantity and small quantity springs based on your specific demand.

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

Fast Lead Time: Delivery within 25 days for standard springs in our mold range; 30-40 days for complex shapes.

Trivalent Zinc Coating: High-quality coating with 8-10 micrometer thickness, ensuring 48 hours without white rust.

Wide Material Range: Available wire diameter from 0.001 to 0.075 inches, covering Music Wire, Carbon Steel, and Stainless Steel.

Professional QA/QC: 100% inspection for finished products including visual and function checks by 8 dedicated inspectors.

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: ≤0.32h

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.