SUS301 Constant Force Spring，Load 3.51 lbs，ID 1.96″,OD 2.2″,Total Length 56″,EXTANDED Length 42″,Material Wideness 1″,Material Thickness 0.015″,Pack of 5

Description

Product Overview

The SUS301 constant force spring is engineered by ShangHai Lijun to deliver a steady pulling force of 3.51 pounds across its full extension range. Constructed from high‑grade spring steel with a 0.015‑inch thickness and a 1‑inch material width, the spring offers exceptional durability and resistance to fatigue. Its inner diameter of 1.96 inches and outer diameter of 2.2 inches provide a compact profile while the total length of 56 inches, with a 42‑inch extended length, allows for versatile integration into a wide variety of mechanisms. The spring is supplied in a convenient pack of five, enabling bulk purchases for manufacturers, maintenance teams, and hobbyists alike.

Usage

Designed for applications that require a constant load, the SUS301 excels in counterbalance systems such as door closers, where it ensures smooth and predictable closing action without the need for complex adjustments. It is also well suited for cable retractors used in industrial equipment, providing reliable tension that prevents cable slack and wear. Hose reel mechanisms benefit from the spring’s consistent force, allowing hoses to retract neatly without jerking. The spring’s robust construction makes it appropriate for outdoor installations, including garden equipment, automotive retractors, and even medical device components where reliability is paramount.

Installation is straightforward: the spring can be mounted using standard brackets or custom‑fabricated housings that accommodate its 1.96‑inch inner diameter. The 56‑inch length provides ample flexibility for designers to route the spring through pulleys or guides, while the 5‑piece pack reduces inventory costs for repeat‑use scenarios.

Why Choose Us

ShangHai Lijun has a reputation for precision engineering and rigorous quality control. Each SUS301 spring undergoes heat treatment and surface finishing processes that meet ISO 9001 standards, guaranteeing consistent performance batch after batch. Our manufacturing facilities employ CNC winding technology to achieve uniform coil spacing, which translates into the reliable constant force that users depend on.

Beyond the product itself, we offer comprehensive technical support, including installation guides, CAD drawings, and responsive customer service. Our after‑sales team is available to assist with any integration challenges, ensuring that your application runs smoothly from day one.

Key Features

• Consistent 3.51 lb pull throughout full extension for reliable operation
• High‑grade spring steel construction resists fatigue and corrosion
• Compact 1.96″ inner diameter fits standard mounting brackets
• Pack of five springs reduces inventory costs for high‑volume projects
• Dedicated technical support and detailed installation documentation

FAQ

What is the maximum extension length of the SUS301 spring?

The spring can be safely extended to 42 inches, providing ample travel for most counterbalance and retracting applications.

Can the spring be used outdoors?

Yes. The spring’s steel composition is treated for corrosion resistance, making it suitable for outdoor environments when installed with appropriate protective hardware.

Is a custom mounting bracket required?

No. The 1.96‑inch inner diameter matches common bracket sizes, allowing for direct installation in many existing systems.

How many springs are included in one pack?

Each package contains five identical SUS301 constant force springs, ideal for bulk projects or spare parts inventory.

What warranty does ShangHai Lijun provide?

We offer a one‑year limited warranty covering material defects and manufacturing errors, backed by responsive customer service.