Renton Coil Spring

Renton Coil Spring Company is a spring maker in Renton, Washington. It makes springs and wire forms for the aviation, space, defense and industrial markets. The company opened in 1949, a few blocks from the Boeing headquarters in Renton. It also serves the motorsport market.

The company offers complete spring services. It can develop its own designs, make small run prototypes and run cycle and fatigue tests in house. A full tooling department makes any changes needed. The site says it works well from a source controlled drawing and can turn the specification into a detailed design. Order sizes run from a single part to large runs.

The history on the site shows steady growth. In 1979 the company led the use of Beta-C titanium as a spring material, working with Boeing and McDonnell Douglas. It earned ISO 9001 certification in 1998. In 1999 it moved to a 46,000 square foot plant nearby. It expanded into motorsport in 2001. It became an FAA approved MRO facility in 2015 and an EASA approved MRO facility in 2026.

Today the company is registered to ISO 9001:2015 and certified to AS9100D. It is also Nadcap certified for heat treating of steel and titanium alloys. The site lists business lines for aviation, space, defense, MRO and commercial customers.

The website lists open jobs for a manufacturing associate, an aerospace CNC machinist and an MRO planning and customer coordinator. The contact page has separate email routes for quotes, orders, engineering and quality documents. The phone number is 425-255-1453.