Penn-Elkco Spring • 1017 Delaum Road • St. Marys, PA 15857 • Toll Free: 1.800.854.4658 • Local: 814.834.4304 • Fax: 814.834.1284
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Penn-Elkco is a leading manufacturer specializing in the production of high-quality Extension Springs. Extension springs are close-coiled, helical springs designed to provide exceptional resistance against tensile loads. Their unique construction sets them apart from compression springs, as the coils are wound tightly together with a built-in initial tension. This initial tension plays a crucial role in regulating the force required to deflect the spring.

Penn Elkco Compression Springs

Our expertise lies in manufacturing a wide range of extension springs, with a particular focus on those that require loops or hooks. Our offerings include single-loop, double-loop, half-loop, and side-loop designs, as well as offset loops, half loops, swivel hooks, long round ends, threaded plugs, and v-hooks. We cater to diverse industries and applications, ensuring that our extension springs meet the specific requirements and expectations of our clients.

At Penn-Elkco, we prioritize precision, quality, and customer satisfaction in the production of extension springs. Our experienced team of engineers and technicians utilize advanced manufacturing techniques and state-of-the-art equipment to ensure consistent and reliable results. We understand the importance of delivering customized solutions, taking into account factors such as load capacity, deflection range, material specifications, and environmental considerations.

When you choose Penn-Elkco for your extension spring needs, you can trust in our commitment to excellence and expertise in the field. We are dedicated to providing high-performance extension springs that meet the demands of various industries. Rely on our exceptional products to deliver optimal performance, durability, and reliability for your specific applications. Experience the difference of working with a trusted leader in extension spring manufacturing—choose Penn-Elkco.

Applications for Extension Springs Include:

  • Automotive Interiors
  • Automotive Exteriors
  • Garage Door Assemblies
  • Vise-grip Pliers
  • Carburetors
  • Trampolines
  • Washing Devices
  • Farm Machinery
  • Toys
  • And so many more...

Emergency Replacment Extension Springs
We can react immediately to custom fabricate that critical broken extension spring to get your equipment back up and running. Contact Us first.


Contact Penn Elkco Spring Company today via our General Contact Form or our Request For Quote Form.

Feel free to contact us by telephone at 1 (800) 854-4658 or e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. We look forward to serving you and your spring manufacturing needs.

iso 9001 ISO 9001:2015 Certified • View Certificate