About

About John Evans’ Sons LLC John Evans’, an international leader in spring design & production with proven expertise in precision. We manufacture a variety of precision springs, wire forms, and spring assemblies. We are dedicated to fully understanding and exceeding customer expectations through teamwork and the ongoing pursuit of technical and manufacturing excellence. We are committed to satisfying the requirements of, maintaining the effectiveness of, and continually improving our quality management system, which is based on the principles of ISO 9001:2015, AS9100, and ISO 13485:2016. Our Engineering staff is eager to discuss the design requirements & challenges in your design & prototype phase. Many choices of counterbalances, springs & reels are stock items & can ship quickly to aid in your product evaluation. John Eavns' Sons is a part of The Lesjöfors Group, which encompasses a vast network of production facilities worldwide. We bring exceptional expertise and state-of-the-art equipment dedicated exclusively to the medical sector. John Evans’, an international leader in spring design & production with proven expertise in precision, utilizing advanced design & manufacturing technology. Offering several counterbalance options to assist/enhance articulated instruments & assemblies, many medical equipment designers utilize constant force springs, constant force spring motors, spiral torsion springs or spring reels. The capabilities of these products have significant benefits compared to traditional helical & gas springs. Constant Force Springs: constant load, smooth range of motion, minimal starting force. Spiral Torsion Springs: develop high torque, rotation in two directions, compact & mounts easily in many designs. Spring Powered Reels: wide range of forces, cable lengths, & travel, mounts quickly & easily, metal and plastic available. Our Engineering staff is eager to discuss the design requirements & challenges in your design & prototype phase. When precision movement defines performance, the springs inside your robotic systems can't be an afterthought. At John Evans' Sons, we bring nearly two centuries of spring manufacturing expertise to the Robotics Summit & Expo — delivering custom-engineered springs and wire forms built for the demands of modern industrial, medical, and aerospace robotics. As America's First Springmaker, we've spent 175+ years perfecting the craft of precision spring design and manufacturing. Today, that legacy powers robotic arms, grippers, actuators, cable management systems, counterbalancing assemblies, and high-energy deployment mechanisms — including applications for NASA. We don't just manufacture springs, we engineer solutions. Our team works directly with OEMs and design engineers from the earliest stages of development, evaluating load conditions, space constraints, material requirements, and cycle life to recommend the right spring type for your application. Whether you need standard springs, fully custom designs, or integrated mechanical assemblies, we reduce development costs and lead time by getting the specification right the first time. Our in-house tooling capabilities, rapid prototyping, and rigorous quality assurance process ensure every component performs consistently across thousands of cycles — with no unscheduled downtime and no compromises. Our product range includes spring types optimized for the unique motion control challenges found in robotic systems: Constant Force Springs — Deliver a consistent load across extending and retracting motions, replacing bulky or expensive motors to keep assemblies compact and cost-effective. Spiral Torsion Springs — Provide reliable rotary motion for applications requiring less than 360 degrees of rotation, generating high torque with minimal angular displacement. Spring Reels, Power Springs, Wire Forms, Vibration Isolators, and Custom Assemblies — Engineered to your exact specifications for balance, tension management, and sensitive component protection. John Evans' Sons upholds ISO 9001:2015, ISO 13485:2016, and AS9100 quality standards. We meet the rigorous demands of aerospace, medical device, and defense robotics applications. Every spring we produce is backed by traceable materials, documented processes, and a quality system built around your industry requirements. Visit Us Our Booth! If your robotic systems depend on precise, repeatable motion — and they do — talk to our team at the Robotics Summit & Expo in Boston. We'll help you identify whether off-the-shelf or custom-designed springs are the right fit for your next project, and show you why engineers and OEMs across aerospace, healthcare, logistics, and manufacturing have trusted John Evans' Sons as their spring manufacturing partner for generations. John Evans’, an international leader in spring design & production with proven expertise in precision. We manufacture a variety of precision springs, wire forms, and spring assemblies. We are dedicated to fully understanding and exceeding customer expectations through teamwork and the ongoing pursuit of technical and manufacturing excellence. We are committed to satisfying the requirements of, maintaining the effectiveness of, and continually improving our quality management system, which is based on the principles of ISO 9001:2015, AS9100, and ISO 13485:2016. Our Engineering staff is eager to discuss the design requirements & challenges in your design & prototype phase. Many choices of counterbalances, springs & reels are stock items & can ship quickly to aid in your product evaluation. John Eavns' Sons is a part of The Lesjöfors Group, which encompasses a vast network of production facilities worldwide. We bring exceptional expertise and state-of-the-art equipment dedicated exclusively to the medical sector. John Evans’, an international leader in spring design & production with proven expertise in precision, utilizing advanced design & manufacturing technology. Offering several counterbalance options to assist/enhance articulated instruments & assemblies, many medical equipment designers utilize constant force springs, constant force spring motors, spiral torsion springs or spring reels. The capabilities of these products have significant benefits compared to traditional helical & gas springs. Constant Force Springs: constant load, smooth range of motion, minimal starting force. Spiral Torsion Springs: develop high torque, rotation in two directions, compact & mounts easily in many designs. Spring Powered Reels: wide range of forces, cable lengths, & travel, mounts quickly & easily, metal and plastic available. Our Engineering staff is eager to discuss the design requirements & challenges in your design & prototype phase.