SUS301 Constant Force Spring by ShangHai Lijun – 0.93 lb Load, 5 Pack

Description

Product Overview

The SUS301 constant force spring is engineered by Lijun to deliver a precise and unvarying 0.93 lb (0.42 kg) pulling force throughout its entire range of motion. Constructed from high‑grade spring steel, the coil features a 0.5″ material wideness and a thin 0.0079″ wall thickness that together provide exceptional flexibility while maintaining structural integrity. The spring measures 1.07″ in inner diameter and 1.2″ in outer diameter, with a total relaxed length of 37.99″ and an extended length of 30″ when fully loaded. Each package contains five individual springs, allowing manufacturers and repair technicians to stock a ready supply for multiple assemblies or to replace worn components without delay. The design incorporates a patented constant‑force mechanism that eliminates the need for additional tensioning hardware, reducing overall system complexity and cost. This product meets rigorous industrial standards, as reflected in its ranking among the top mechanical constant force springs on major e‑commerce platforms. Its compact footprint and lightweight construction (approximately 4 ounces per unit) make it suitable for integration into space‑constrained equipment, while the durable coating resists corrosion in humid or chemically aggressive environments.

Usage

Constant force springs like the SUS301 are widely employed in applications where a steady pulling force is required over a long travel distance. Typical uses include counterbalancing mechanisms in office furniture, automatic door closers that need a consistent torque to ensure smooth operation, and cable retractors for tools, medical devices, and consumer electronics. The spring’s reliable 0.93 lb load makes it an excellent choice for hose reels that must unwind without jerking, as well as for tensioning systems in agricultural equipment where variable loads can otherwise cause wear. Because the spring operates without friction‑inducing components, it delivers silent performance, an advantage in noise‑sensitive environments such as libraries, laboratories, and hospitality venues. Installation is straightforward: the spring can be anchored at one end to a fixed point while the opposite end attaches to the moving component, allowing the spring to expand and contract freely. Its dimensions are compatible with standard mounting brackets, and the 5‑pack packaging ensures that spare parts are readily available for routine maintenance schedules. Engineers often select the SUS301 for prototype development because its predictable force curve simplifies design calculations and reduces the need for extensive testing.

Why Choose Us

Choosing the SUS301 constant force spring from Lijun means selecting a product backed by decades of spring‑manufacturing expertise and a commitment to quality assurance. Each spring undergoes a multi‑stage inspection process that includes dimensional verification, load testing, and surface finish analysis to guarantee that it meets or exceeds the specifications listed in the product data sheet. Lijun’s state‑of‑the‑art production facilities employ precision winding equipment that ensures uniform coil geometry, which directly translates to the consistent force output that customers rely on. In addition to the robust physical attributes, the company provides comprehensive technical support, offering design assistance, custom‑size options, and rapid response to any performance inquiries. The SUS301 is also covered by a limited warranty that protects against material defects, reinforcing confidence in long‑term reliability. By sourcing this spring from Lijun, purchasers benefit from competitive pricing, especially when buying in bulk, and from a supply chain that prioritizes on‑time delivery and transparent communication. The brand’s reputation for environmental responsibility further adds value, as the manufacturing process adheres to eco‑friendly practices and waste‑reduction protocols.

Key Features

• Provides a steady 0.93 lb load, eliminating the need for additional tensioning devices.
• Compact 5‑pack packaging saves space and ensures you always have spares on hand.
• High‑grade spring steel construction offers excellent durability and corrosion resistance.
• Precise dimensions (1.07″ ID, 1.2″ OD) fit a wide range of standard mounting brackets.
• Backed by Lijun’s technical support and warranty for peace of mind.

FAQ

What is the maximum travel distance for the SUS301 spring?

The spring can extend from its relaxed length of 37.99 inches to an extended length of 30 inches while maintaining the constant 0.93 lb load, giving a usable travel range of about 7.99 inches.

Can the SUS301 be used in outdoor or marine environments?

Yes. The spring is fabricated from corrosion‑resistant steel and can operate reliably in humid or salty conditions, provided it is installed with appropriate protective hardware to avoid direct exposure to seawater.

Is it possible to order the SUS301 in a different load rating?

Lijun offers a family of constant force springs with various load capacities. Customers can request a custom load rating, and the engineering team will work to match the required specifications while maintaining the same form factor.

How do I install the spring to achieve the constant force effect?

Mount one end of the spring to a fixed anchor point and attach the opposite end to the moving component. Ensure the spring is aligned with the direction of motion and that there are no obstructions that could impede its expansion or contraction.

What warranty does Lijun provide for the SUS301 spring?

The spring comes with a limited one‑year warranty covering material defects. If a defect is identified within this period, Lijun will replace the spring at no additional cost, subject to the terms and conditions outlined in the warranty documentation.