For the engineers, makers, and repair pros out there, these SUS301 constant force springs are seriously impressive pieces of precision engineering! This pack gives you five identical springs made from high-quality Type 301 Stainless Steel that provides consistent performance and corrosion resistance. The specifications are precise: they exert 0.93 lbs of load, with an inner diameter of 1.07 inches, outer diameter of 1.2 inches, and total length of 37.99 inches. What makes constant force springs special is how they maintain nearly the same force throughout their extension range - unlike regular springs that get stronger the more you stretch them. Once you extend them to about 1.25 times their diameter, they hit their full rated load and then stay remarkably consistent regardless of how much further you extend them. This makes them perfect for applications where you need predictable, constant tension - think retractable cords, counterbalance systems, tool returns, or any mechanism requiring smooth, consistent force. The stainless steel construction means they'll hold up in various environments without rusting or degrading, and the pack of five gives you extras for prototyping or replacements. The manufacturing quality is evident in the consistent coil formation and smooth edges. Whether you're building custom machinery, repairing existing equipment, or working on innovative projects, having these precision springs on hand can solve so many design challenges. They're the kind of component that looks simple but represents serious engineering sophistication - absolutely essential for anyone working with mechanical systems that require reliable, constant force applications!
Free 30-day returns 
Free 30-day returns
