Coiling Technologies, Inc. designs and manufactures custom suspension springs to meet your requirements. From the suspension of high-performance cars, trucks, and military vehicles, our ISO 9001-certified suspension coil springs are trusted across all types of automotive and defense platforms. We collaborate directly with clients to configure and create custom coil springs precisely to their specifications.
Our coil springs are primarily manufactured with high-tensile Chrome Silicon (CrSi) alloy wire, an ideal material for delivering the lightest possible spring using carbon-based steel. When reducing mass is critical, we also offer Titaniums and other exotic alloys. Contact us to start your custom suspension spring project today.
Suspension Springs for Vehicles
Suspension springs are a key component in your vehicle’s dynamic performance; they can be designed to improve handling and ride quality while enhancing performance and safety. Our custom coil springs support a wide range of vehicle markets:
- High-performance race cars and trucks — Our customers include former Baja 500 and Baja 1000 winners, as well as some of the most respected racing industry suppliers.
- Military — We produce suspension springs for numerous U.S. government and military vehicles, including HMMWV up-armor kits and MRAP (mine-resistant ambush-protected) platforms.
- Jeeps and Trucks — We supply coil springs for lifted suspensions used in heavy-duty and off-road vehicles.
- Utility Task Vehicles (UTVs) — We build customized suspension springs for this growing market.
- Motorcycles — We develop custom coil springs for both motocross and road bikes.
- OEMs — We design and produce custom suspension springs for limited-run and low-volume niche vehicles.
Please note: We typically do not do one-off jobs for single-vehicle suspension systems. However, if your application is critical for a custom job, contact us, and we can discuss a solution.
Custom Coil Spring Sizes
Our experts can configure and create custom suspension springs to your exact specifications—from small springs for lighter UTV and sports-car applications to extreme heavy-duty springs destined for emergency and military vehicles.
| Technical Specification | Suspension Springs |
|---|---|
| Material diameter size |
From 0.093 inches to 2.50 inches (2.40 – 63.50 mm) |
| Maximum outside diameter |
23.5 inches (600 mm) |
| Maximum length |
72 inches (1830 mm) |
| End types |
Squared, ground, blunt end, reduced ends (pigtailed) |
| Shapes |
Squared, barrel, conical, hourglass, and straight |
Suspension Spring Materials
Coiling Technologies sources only the best raw materials globally to manufacture our custom suspension springs. The materials we use meet, and nearly always exceed, OEM standards. We offer an extensive array of alloys so you can select the ideal spring material for your application. Contact us today to determine the best material for your coil spring.
High-strength carbon alloys are engineered to offer superior mechanical properties compared to low-carbon steels. These steels are often subjected to tempering, a heat treatment process that can improve ductility and toughness by reducing brittleness after hardening. Many of these high-strength steels are developed for applications where weight reduction is crucial, such as in the automotive industry, due to their favorable strength-to-weight ratio. These alloys typically have tensile strengths that can exceed traditional limits, reaching well above 235 ksi, allowing for enhanced performance in demanding applications.
Chrome Silicon Steel is recognized for its exceptional tensile strength and resilience to moderate temperatures of up to 400 °F (204 °C), making it ideal for high-performance vehicle springs. This material complies with standards such as ASTM A401, A1000; SAE 9250/9254; DIN 54SiCr6; EN 1.7102; and JIS SUP12. Designed for high hardness and fatigue resistance, it is capable of significant mass reduction, comparable to titanium springs when optimized correctly. It is important to note that while Chrome Silicon Steel boasts high tensile strength, the primary advantage of superalloys lies in their superior high-temperature performance rather than room-temperature tensile strength. Limitations in design apply to coil diameters under 0.812" (20.6 mm).
Outstanding toughness, ductility, and fatigue resistance in larger diameters above 1.00" (25 mm). Compliant with ASTM A689, A29, A304; DIN 55Cr3; EN 1.7176; JIS SUP9. Common for heavy-duty suspension springs in trucks and military vehicles.
6150 Chrome Vanadium Alloy Steel
Superior toughness and ductility; excellent fatigue resistance above 0.75" (19 mm). Meets ASTM A108, A331; DIN 50CrV4; EN1.8159; JIS SUP10. Typically used in dynamically loaded suspensions in large trucks and commercial/military applications.
Non-ferrous, exotic alloy used in high-performance racing vehicles. Offers a high strength-to-weight ratio, with density just 56% that of high-carbon steel. Excellent corrosion and high-temperature resistance (beyond 600 °F/316 °C). Common grades include ASTM Grade 5 (Ti-6Al-4V) AMS 4928, UNS R56401; Beta-C grades (15V-3Cr-3Al-3Sn, AMS 4914) offer 15–20% higher tensile strength (~210 ksi). Be aware that titanium’s lower modulus of rigidity (~5.6×10⁶ psi vs. 11.5×10⁶ psi for steel) means fewer active coils must be used. Availability is limited and cost ranges from 10–50× that of steel.
Engineering Considerations
Designing custom suspension springs requires detailed consideration of ride frequency, damping characteristics, and fatigue endurance. Our engineering team applies rigorous methods—including finite element analysis, material fatigue testing, and prototype validation—to ensure optimal performance across the spring life cycle.
Industries and Applications
Our suspension spring specialists serve a diverse range of markets, including:
- Automotive performance and OEM tiers
- Defense and military suspension systems
- Off-highway and industrial machinery
- Motorsports, UTVs, and specialized vehicle platforms
Each application benefits from tailored material selection, spring geometry, and manufacturing processes.
Quality, Testing, and Manufacturing
Coiling Technologies manufactures custom suspension springs with full in-house capabilities:
- Heat treating, powder coating, and special finishes
- Magnetic particle inspection and shot peening
- Cycle testing, stamping, and wire forming
- ISO 9001-2015–certified quality systems ensuring repeatability and tight tolerances
- Prototype to high-volume production runs executed from our 110,000 sq ft Houston facility
Why Work with Coiling Technologies, Inc.
We are not just a suspension spring manufacturer—we are your engineering partner. With over 45 years of experience, state-of-the-art production methods, and a deep material sciences foundation, we deliver custom suspension springs that meet even the most exacting performance criteria.
Request a Quote
Ready to specify custom springs for vehicle suspension or need technical support for your next design phase? Request a quote or contact us to discuss your requirements.
