Can you provide samples?

Yes, we can send samples for your approval within 7 days. Samples are free of charge if we have available tools.

What is the supply ability?

The supply ability is 30,000 Pieces per week.

What is the validity period of the product?

The period validity is one year.

What's the payment term?

TT 30% in advance,the balance before shipment

Ss301 OEM Constant Force Spring Fire Negator Shutter Damper Torque Force Spring for HVAC System

Name: Ss301 OEM Constant Force Spring Fire Negator Shutter Damper Torque Force Spring for HVAC System
Brand: Dongguan Weihui Hardware Spring Products Co., Ltd.
SKU: 1972160071

Guangdong, ChinaDongguan Weihui Hardware Spring Products Co., Ltd.

US$0.09

1,000 Pieces

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Function

Balance

Material

Stainless Steel

Usage

Industrial, Motorcycle

Load Type

Bend

Production Process

Hot Roll

Shape

Leaf

Surface Treatment

Natural

Application

Fire Damper

Transport Package

Inner Plastic Bag and Outer Carton

Specification

CUSTIOMIZED

Trademark

N/A

Origin

China

HS Code

7320909000

Production Capacity

30000 Pieces/Week

Key features

Constant Force Output: Provides consistent and highly reliable force over the spring's travel length for smooth extension and retraction.

Customizable Color: Color is available as per customer customization requirements.

Fire Damper Application: Ideal for actuating metal curtains in fire dampers to prevent smoke or fire spread in ductwork.

High Endurance Limit: Endurance limit reaches up to 100,000 cycles for long-term reliability.

Material: Stainless Steel 301: Constructed from high-quality Stainless Steel 301 for durability and corrosion resistance.

Custom Dimensions: Load and size are determined by material thickness, width, and coil diameter; drawings accepted.

Fast Sample Delivery: Samples available for approval within 7 days; free of charge if tools are available.

OEM/ODM Service: Full customization, minor customization, and flexible customization available from samples or designs.

Company profile

Years of Export ExperienceHigh Repeat Buyers Choice

Dongguan Weihui Hardware Spring Products Co., Ltd.

Guangdong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 10 years CertifiedNearest Port: Guangzhou Port, Shenzhen PortAverage Response Time: ≤4.33h

AI-Powered supplier vetting

SummaryThe supplier is identified as a combined company and a professional technical supplier with manufacturing, export, service, quality-control, and R&D capabilities. It supports extensive customization, ODM, OEM for well-known brands, and reported new product development in the past year. Production exceeds 10 lines, with 6–10 quality-control staff, but only one year of total R&D engineer experience is stated. Service-support infrastructure is limited: no overseas warehouse, showroom, agents, branches, or offline trade-show participation, and no overseas service countries are reported. The supplier has quality assurance, but lacks written service procedures and an approved-supplier list. Financial records are identified by year, but no performance values are provided. No certification information or specific customer cases is supplied.

Supplier typeThe supplier is explicitly described as a professional technical supplier and a growing manufacturer, while its company type is listed as Combined. It reports more than 10 production lines and offers manufacturing, export trade, service, quality-control, and R&D functions.

R&D capabilityThe supplier is identified as a professional technical supplier, reported new products during the past year, and offers ODM services. However, it has no available SDK, and the stated total experience of R&D engineers is only one year, so the evidence supports product-development activity but not a conclusively strong innovation position.

Production capacityThe supplier operates more than 10 production lines, has 6–10 quality-control staff, and reports peak- and off-season lead times ranging from within 15 workdays to one month. Finished products are checked by packing staff, indicating an inspection step, although the stated inspection method appears limited.

Customization capabilityThe supplier explicitly supports customization from samples, designs, full customization, minor customization, and flexible customization. It also provides ODM and OEM services, including OEM service for well-known brands, directly demonstrating broad customization capability.

Product Q&A

Q:What is a constant force spring used for?

It is an excellent device for applications requiring a constant load, such as counterbalances, door closers, cable retractors, hose retrievers, tool head returns, cabinet furniture, gym equipment, hair dryers, toys, electric motors, appliances, space vehicles, and other long-motion functions. It generates constant force to lift goods at an even speed.

Q:What size is the constant force spring?

The constant force spring can be customized. The load is determined by the thickness and width of the material and the diameter of the coil. Please send us the size or drawing to check manufacturing feasibility.

Q:What information is needed for customization?

Please provide the following basic information: 1. Material type, 2. Thickness, 3. Width, 4. Length, 5. Outer diameter or inner diameter.

Q:What is the minimum order quantity?

The minimum order quantity is 1000 Piece/Pieces.

Q:What is the lead time for production?

The lead time is 6-10 days.