John Evans’ Sons, is the international leader in the design and manufacturing of constant force springs, constant force spring assemblies and precision specialty springs for motion control requirements for the aerospace industry.

We are a trusted spring designer and supplier, as evident by our commitment to manufacturing excellence. All of our products align with strict quality standards. We are ISO 9001, AS9100 certified and International Traffic in Arms Regulations (ITAR) registered.

Our custom design and precision manufacturing capability are supported by a complete machine shop staffed by a professional crew of toolmakers who utilize Dessault Systemes Solid Works for design, and Charmilles EDMs for tool and die production. This allows us to build, maintain, and repair all tools utilized in our production areas. We design and build many of our own high speed, automated, spring manufacturing machines. This “on-site” capability further reduces cost and lead time for our customers.

Major aerospace and defense corporations have recognized our quality manufacturing. Kaman Aerospace has presented our company with its top award for outstanding quality and on-time delivery by a component vendor to a major defense contractor.

Some of our most notable projects include:

• Airborne FLIR camera mounting
• Sub-launch Tomahawk cruise missile
• Aircraft door counterbalance mechanisms
• Suspension components for the Mars rover Curiosity.

With respect to motion control applications, we offer several counterbalance options to assist/enhance articulated instruments and assemblies. Many aerospace 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 with traditional helical springs and gas springs.

Constant Force Springs

• Constant load
• Smooth range of motion
• Minimal starting force

Helical Vibration Isolators

• Maintenance free
• Three axes protection (compression, shear and roll)
• Optimal performance in extreme temperature and corrosive environments

We provide impeccable service from start to finish and set the standard for world-class precision spring products.