What is the minimum order quantity?

MOQ is negotiable, and a small first order is accepted to confirm fit and quality.

How long is production and delivery?

Samples take 5 to 7 days, and bulk orders take 15 to 30 days depending on quantity.

How do you ensure quality before shipment?

They are packed in polybag, paper carton and a wooden case after testing by an ISO 9001 certified factory.

Tension Ext Extension Spring for Industrial Use ISO9001 Certified

Name: Tension Ext Extension Spring for Industrial Use ISO9001 Certified
Brand: Jinan Chenji International Trade Co., Ltd.
SKU: 2191478342

Shandong, ChinaJinan Chenji International Trade Co., Ltd.

US$9.90

20-99 Sets

US$7.90

100-299 Sets

US$6.90

300+ Sets

Sample price:US$58.00/piece.Request sample

Product profile

Customization

Available

Function

Buffer, Drive

Material

Steel

Model NO.

CS-SP-495

Usage

Auto, Home Appliance

Load Type

Extension

Production Process

Cold Roll

Shape

Coil

Spring Material

Carbon Steel Spring Wire

Structure

Double Hook Extension Coil

Package

Polybag-Paper Carton-Wooden Case

Custom HS Code

73202010

Wire Diameter

0.1-80 mm

MOQ

Any Small Trial Order Is Welcome

End Type

Double Hook Ends

Application 1

Industrial Door Tensioner, Counterbalance

Application 2

OEM/ODM Custom Applications

OEM Service

Available

Factory Since

2014

Production Equipment

35 Sets of Spring Manufacturing Equipment

Transport Package

100X100X100cm Wooden Case, 1100kg, Seaworthy

Specification

standard

Trademark

chenji

Origin

China

HS Code

7320209000

Production Capacity

49000PC/Week

Key features

ISO 9001 certified tension ext extension spring manufacturer since 2014 with 35 sets of production equipment

tension ext extension spring engineered for Industrial Door Tensioner, Counterbalance and OEM/ODM Custom Applications with 0.1-80 mm wire diameter

Offered in 0.1-80 mm wire diameter with 18 mm inside diameter for the tension ext extension spring

100% pre-shipment inspection with load and fatigue testing on every CHENJI-EXT-09 production lot

Shot peened and poly coated surface treatment for corrosion protection on the tension ext extension spring

OEM and ODM private-label manufacturing for CHENJI-EXT-09 with custom branded packaging

35 sets of production equipment producing tension ext extension spring to ISO 9001 standards

Custom wire diameter, free length, end form and finish available for the tension ext extension spring

Company profile

Years of Export ExperienceImporters and Exporters

Jinan Chenji International Trade Co., Ltd.

Shandong, China

Business Type: Manufacturer/Factory, Trading CompanyExport Year: 2014-09-17Nearest Port: QingdaoAverage Response Time: ≤3.63hTerms of Payment: T/T, PayPal, Western UnionInternational Commercial Terms(Incoterms): FOB, CFR, CIF

AI-Powered supplier vetting

SummaryThe supplier is identified as a professional technical supplier offering 3D software design, SDK support, ODM, OEM, and multiple customization options. It reports brewing-equipment production of 1,000 sets annually, exports to a broad range of regions, and generally states lead times of within 15 working days off-season and one month during peak season, although another slice reports within 15 working days during peak season. CE certification and regular fire drills are documented. After-sales services include installation, debugging, maintenance, repair, and training. Financial records are indicated for 2021–2023, but no financial performance values are provided. Innovation evidence is weak because no new products were launched in the past year, and quality-control test equipment is reported as zero. The supplier states OEM service for popular brands, but no specific customer names or case details are provided.

Supplier typeThe supplier is explicitly identified as a professional technical supplier and provides 3D software design services. This supports classification as a technical and design-capable supplier rather than only a standard product manufacturer.

CertificationsThe supplier reports sustainable-development and product certification capability through CE certification. This is explicit certification evidence, although no additional certification types are listed.

After-Sales capabilityThe supplier has documented procedures and records for handling customer complaints and service corrective/preventive actions. It offers installation, debugging, maintenance, repair, and training, with service coverage determined by customer demand; however, it has no overseas warehouses, showrooms, agents, or branches.

Production capacityThe supplier reports annual brewing-equipment production of 1,000 sets, exports to numerous global regions, and an off-season lead time within 15 working days. It also reports one month for peak-season fulfillment in one slice, while another states within 15 working days during peak season, so peak-season capacity information is inconsistent.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization. This is direct evidence of broad customization capability.

Product Q&A

Q:What kind of spring is this double hook extension spring?

The double hook extension spring is a double hook extension coil supplied with double hook ends, made from carbon steel spring wire, sized for counterbalance use.

Q:Which sizes can you supply for this spring?

It offers a 18 mm inside diameter and a 0.1-80 mm wire diameter range.

Q:What is this double hook extension spring used for?

It is made for industrial door tensioner, counterbalance and oem/odm custom applications work, including counterbalance use.

Q:Is this spring under constant tension?

It is a double hook tension spring for counterbalance and industrial door tensioning duty.

Q:Is private label manufacturing available?

Yes, custom wire diameter, free length, rate and finish are available on request.