Spring Design Guide
Wire diameter, end configurations, and stress calculations for compression, extension, and torsion springs.
Resource Center
Engineering resources & design guides
Free design references, material guides, and technical answers — drawn from seven decades of spring manufacturing.
Material Selection
When to specify music wire, stainless, chrome silicon, Inconel, or Elgiloy — and how to avoid over-spec.
Engineering Resources
DFM checklists, tolerance recommendations, and design templates from our engineering team.
FAQ
Answers to common questions about lead times, MOQs, tooling, and quoting.
Technical Articles
Deep-dive articles on spring fatigue, life testing, and material treatments.
Manufacturing Insights
How CNC coiling, fourslide, and secondary ops affect cost, lead time, and quality.
FAQ
Frequently asked questions
What's your typical lead time?+
Prototypes ship in 48 hours to 2 weeks depending on complexity. Production lead times average 3–6 weeks, with Kanban programs available for shorter intervals.
Do you have a minimum order quantity?+
No hard MOQ. We routinely produce prototype runs of 5–50 pieces and production runs from a few hundred to several million pieces per year.
Can you work from a sketch instead of CAD?+
Absolutely. Send a sketch, photo, or even a sample spring — our engineers will reverse-engineer the geometry and produce CAD for your approval.
Are you ITAR registered?+
Yes. Rockford Spring is ITAR-registered and routinely supports US aerospace and defense programs that require controlled-distribution components.