Nose & Cockpit of modern corporate jet. With years of experience and outstanding service, John Evans’ Sons is a world class manufacturing partner for the aerospace industry.

With years of experience and outstanding service, John Evans’ Sons is a world-class aerospace spring manufacturing partner.

Many of our customers come to us having an understanding of their own products but need assistance designing a spring that will perform the necessary action. We do more than just manufacturing. Our design team is able to assist with developing correct spring calculations and configurations.

In many instances, our standard springs already meet customer specifications. These standard spring products may also be used in custom mechanical assemblies.

Applications and Projects

Some of our most notable projects include Airborne FLIR camera mounting, sub-launch Tomahawk cruise missile, and drone aircraft launch and recovery. We’ve also manufactured suspension components for the Mars Rovers Curiosity and Perseverance.

We offer several counterbalance options that work with aerospace equipment.

Constant Force Springs that are overlaying where they are used on a plane.There are several ways to counterbalance jet stairs or main door/stairs constant force springs can be used in a “gang” arrangement, i.e. side by side in a multi-spring assembly.

There are several ways to counterbalance jet stairs or main door/stairs as shown in the image (right).

Constant force springs can be used in a “gang” arrangement, i.e. side by side in a multi-spring assembly. This allows for hundreds of pounds of counterbalance force to be available to assist in deploying & retracting the main entry door/stairs, or cargo doors. The two uppermost arrangements show cables exiting housings in the bulkhead allowing the force from the spring assembly to be applied to the door/stairs at a point near the lower steps.

The third arrangement shows another option when used in conjunction with a lever rather than a cable assembly, which allows for the use of spiral torsion springs. The main property of this type of spring is great forces generated but in a small amount of deflection. The application shown (at right) requires only 50 degrees of deflection to achieve a given counterbalance force.

Your application may also require a spring sub-assembly consisting of components from different materials. John Evans’ Sons can put together the sub-assembly with a specialty spring and customer-designated or supplied additional parts. Our ability to produce sub-assemblies is one of the reasons we stand apart from other spring manufacturers.

Have a unique aerospace application that requires a spring or assembly? Provide information about your customization needs, and a member of our design engineering team can assist you.

Spring Manufacturing Excellence

John Evans’ Sons is a trusted aerospace spring manufacturer. All of our products align with strict quality standards. We are AS9100 certified, which is the widely adopted and standardized quality management system for the aerospace industry. This certification also includes the requirements of ISO 9001:2008.

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

In addition, we are members of the National Business Aviation Association (NBAA), the leading organization for companies that rely on general aviation aircraft to support their business operations.

John Evans’ Sons is registered and compliant with International Traffic in Arms Regulations (ITAR).

For more information about our aerospace products and capabilities, view additional resources below. Ready to request a quote or talk with a John Evans’ Sons representative? Complete our contact form or call 215-368-7700.

More Information & PDF Downloads

John Evans' Sons Profile Download .pdf
John Evans' Sons Profile

Aerospace Introduction

John Evans' Sons Products Introduction Download .pdf
John Evans' Sons Products Introduction

Aerospace Products

Constant Force Chart Download .pdf
Constant Force Chart

Selection Chart (stock springs)

Vibration Isolators Download .pdf
Vibration Isolators

Isolator Introduction

Enclosed Spring Reels Download .pdf
Enclosed Spring Reels

Aerospace Related Enclosed Reels

Large Spring Reels Download .pdf
Large Spring Reels

Large Reel Information & Charts

Got A Question? Consult our Experts.

Our Technical Team offers a depth of expertise to assist you with all parts of the process. We are ready to answer your questions in a timely manner and will help you define what you need. We produce custom springs for all purposes, and we are here to work with you on any of your customization needs.