Extension springs are helical wound coils, wrapped tightly together to create tension. Extension springs are designed to resist a pulling force, returning to a tightly wound coil when the force is removed.
Custom extension springs from Springfield Spring & Stamping are manufactured on state-of-the-art CNC wire forming equipment (for example, the CNC Itaya Wire Former; the CNC Orimec MLS-10V). This allows us to offer a wide variety of custom extension spring options with various end types; our custom extension springs are available with machine, crossover, side, or extended end options.
The highest grades of spring wire are used in manufacturing Springfield Spring & Stamping products. “Spring steel” is a term that includes music wire, hard-drawn wire and oil-tempered wire. Alloy steels for stock extension springs are offered only in 300 series stainless steel. For custom extension springs, we offer several steel and metal options depending on your specifications.
Tolerances for extension spring rates depend upon the body-diameter to wire-diameter but are usually +/- 10% and +/- 5% on the diameter. The initial tension is much more difficult to control and is offered as a reference value only.
The hooks or loops may have an across center transition of the last coil before forming the hook or loop. The angle between hook/loop planes (end position) is random. If you need a specific end configuration on your custom extension spring, please contact our custom spring department directly.
Note: These are sample values, and will be replaced.
|Wire Diameter Min||Wire Diameter Max||Spring End Types|
|Direction of Helix||Spring Materials||Finishes|
Pre Tin-Coated Music Wire
Hard Drawn MB
Duirem Color Code
Phosphate w/ Oil
Zinc (Clear and Yellow)
|Equipment||Secondary Services||Industry Focus|
|CNC Machinery (Itaya Wire Former and Orimec MLS-10V)
22000 sq-ft Facility
Cost Reduction Programs
Statistical Process Control (SPC)
Automative FMEA and PAPP
Printed Circuit Boards
Lawn and Garden Tools
Air Filter Hardware
Laser Toner Recharge
|Production Volume Min||Production Volume Max||Industry Standards|
Speciality Production Shop
Prototype (Rapid Prototyping for Design Qualification)
|Millions of units
ANSI/ASQ National Accreditation Board
American Society for Testing and Materials
International Organization for Standardization (ISO 9001:2008)
International Traffic in Arms Regulations
National Minority Supplier Development Council
Restriction of Hazardous Substances (Compliant)
Registration Evaluation Authorization and Restrictions of Chemicals
Society of Automotive Engineers
Small Business Administration
|We utilize CADKEY Creator and can translate most of the common CAD files for use
AutoCAD (DWG and DXF)
Bit Mapped Graphics
Graphics Interchange Format
JPG or JEPG
Joint Photographic Experts Group
Tagged Image File Format