Custom High-Precision Extension Springs with Controlled Initial Tension & ±0.5mm Length Tolerance

1.Tension Spring Quick Detail

Tingfeng Hardware provides professional custom tension (extension) spring manufacturing services, with 15 years of precision wire forming experience. Our production line is optimized for tension springs with wire diameters ranging from Φ0.1–12mm, capable of handling various complex end loops. We support everything from single-piece prototype verification to mass production of 500,000 pieces daily, with comprehensive surface finish options. Backed by an ISO/IATF dual-certified quality system and a library of 200+ proven molds, we ensure functional samples within 48 hours and trial production initiation within 72 hours, serving as your reliable extension force solution provider.

2.Tension Spring  Product Description

Tension springs, by storing energy in the stretching direction, are widely used in mechanisms that provide return force, maintain tension, or balance weight. As your deep manufacturing partner, we not only manufacture springs but also provide comprehensive engineering analysis. Our expertise spans from miniature, high-precision tension springs to medium-sized, high-load tension springs, with a wide range of materials to choose from, including stainless steel, high-carbon steel, and copper alloys, complemented by targeted heat treatments and surface finishes (such as galvanizing and nickel plating). Through advanced equipment and the collaboration of our engineering team, we can transform your designs into products with stable initial tension, accurate load profiles, and excellent fatigue life, thereby enhancing the reliability of your final components.

3.Tension Spring  Product Features & Advantage

4. Tension Spring  Product Specification

5.Tension Spring  Product Application

Our custom tension springs are ideal for high-reliability applications:

Automotive Field: Used in brake pedal return, trunk lid assist, seat adjustment mechanisms, requiring long life and fatigue resistance.

Appliances & Tools: Applied in washing machine door locks, power drill switch return, lawn mower recoil starters, needing stable pull force and reliable end connections.

Fitness & Medical Equipment: Such as weight stack balancing systems in gym equipment, medical traction devices, demanding extremely high standards for force smoothness and safety.

Industrial & Commercial Equipment: Used for automatic door return, conveyor belt tensioning, cash register drawers, often operating under frequent cycling conditions.

6. Frequently Asked Questions (FAQ)
Q: Can you handle complex custom designs and provide design optimization suggestions?
A: Absolutely. This is our core expertise. We provide free DFM analysis within 3-5 days, often helping clients achieve 15-30% cost reduction through design for manufacturability.
Q: How do you ensure quality consistency and handle defect issues?
A: We implement a rigorous 4-stage QC system with 100% full inspection. Our track record shows 99.99% qualification rate.
Q: What are your lead times and how do you handle urgent orders?
A: Standard lead times: 3-7 days for prototypes, 7-15 days for mass production. We offer VIP prioritization cutting lead times by up to 30%.
Q: Will I get timely responses and professional support throughout the project?
A: Yes. You get a 1v1 exclusive consultant with 1-hour initial response commitment and 24-hour technical support.
Q: Can you provide material certifications and environmental compliance reports?
A: Yes. We provide material certifications and environmental test reports (RoHS, REACH compliant) upon request.
Q: How do you protect my designs and intellectual property?
A: We start with mutual NDA and implement strict mold ownership protection and confidential data security measures.
Q: What are your payment terms and MOQ requirements?
A: We offer flexible payment terms (T/T, L/C at sight) and MOQ from 1 piece for prototyping.