Coiling Technologies Inc. designs and develops customized suspension springs to your requirements.

Our engineers work closely with you to configure and create custom suspension springs that meet your exact specifications. The suspension springs are primarily manufactured with high tensile grade Chrome Silicon (CrSi) alloy wire. It is an ideal material for providing the lightest spring possible when utilizing carbon-based steel. However, there are many alloys available to produce a custom suspension spring including Titanium if you are seeking the lightest spring possible. 

Suspension Springs for Vehicles

Suspension springs are a key component in your vehicle’s dynamic performance; they can be designed to improve the handling and ride quality along with increasing performance and safety. Our custom suspension springs can be produced for a wide range of vehicle markets:

High-performance race cars and trucks: Our customers include former Baja 500 and Baja 1000 winners, and some of the most respected suppliers in the racing industry.

Military: We produce suspension spring for numerous U.S government and military vehicles which include HMMWV (Hummer) up armor kits and MRAP (mine resistant ambush protected) vehicles.

Jeeps and Trucks: We produce suspension springs for lifted suspensions for heavy-duty and off-road vehicles.

Utility Task Vehicles (UTVs): We produce customized suspension springs for this popular and growing market.

Motorcycles: We develop customized suspension springs for both motocross and road bikes.

OEMs: We can design and produce customized suspension springs for limited production 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 necessary for a custom job, contact us and we can discuss work with you. 

Custom Suspension Spring Sizes

Our experts can configure and create customized suspension springs to your exact specifications – from small springs for use in lighter UTV and sports car applications to extreme heavy-duty springs slated for emergency and military vehicles. We can produce suspension springs to almost any configuration:

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)


Squared, barrel, conical, hourglass, and straight


Suspension Spring Materials

Coiling Technologies sources only the best raw materials around the globe to manufacture our customized suspension springs. The materials we use meet – and almost always – exceed OEM standards. We offer an extensive array of materials to choose from to ensure the best possible spring for a given application.

High-Strength Carbon Alloys: Provides better mechanical properties and tensile strength than low carbon steel. These alloys have high hardness and strength, but still retain their ductility due to the induction tempering process. These materials are used for springs that do not require the lightest possible weight and when cost is a consideration. These materials fall under the ASTM A229 and UNS K08500 for high carbon alloy wire specifications. Usually the material tensile is less than 235 Ksi.

Chrome Silicon Steel: Has high tensile strength properties beyond most super alloys and have resilience to temperatures of 400 F, making it ideal for springs used in high-performance vehicles like race cars. These alloys fall under the ASTM A401 and ASTM A 1000 grades and SAE 9250 and SAE 9254, BIS 685 A57, DIN 54SiCr6, EN 1.7102, and JIS SUP12 specifications. The induction tempered properties allow for a high hardness beyond conventional high carbon steels. When properly designed high tensile chrome silicon springs can approach the mass reduction of a titanium alloy spring. The primary reason for this is that the material tensile can exceed 300 Ksi and still provide the ductility necessary for excellent fatigue performance. The limiting factor is restricted material sizes to less than 0.812” (20.6 mm)

5160 Alloy Steel:  Provides outstanding toughness, good ductility, and good fatigue resistance in larger material diameters that exceed 1.00” (25 mm). This alloy falls under ASTM A689, ASTM A29, and ASTM A304, DIN 55Cr3, EN 1.7176, and JIS SUP9. The most common use is for heavy-duty spring applications in large vehicle suspension such as truck lifts and commercial or military vehicle applications.

6150 Chrome Vanadium Alloy Steel: Provides superior toughness, tremendous ductility, providing excellent fatigue resistance in larger material diameters that exceed 0.75” (19 mm). ASTM A108, ASTM A331, BS 735A50, DIN 50CrV4, EN1.8159 and JIS SUP10 specifications are common for this alloy. The most common use in the automotive industry is for high dynamic spring loading applications in large vehicle suspension such as truck lifts and commercial or military applications.

Titanium: Ti is an exotic no ferrous alloy usually used for springs found in high-performance racing cars. It has a high strength-to-weight ratio with a density that is 56% of high carbon steel. It has a high resistance to corrosion and elevated temperatures beyond 600 F. A strong, lightweight, and durable option for applications requiring low mass and high strength. The most common grades to use in suspension applications are ASTM Grade 5, Ti-6Al-4V, AMS 4928, UNS R56401. This is typically a lower strength grade however, one of the most common Titanium grades hence its prolific commercial use. The Beta C grades offer higher strength and performance but are less common commercially but have a 15-20% higher tensile strength than the more common Grade 5 alloy. The Beta alloy grade specifications are 15V-3Cr-3Al-3Sn and AMS 4914. The tensile capabilities are as high as 210 Ksi for spring application. An important aspect to keep in mind when specifying Titanium material is that the wire diameter needs to be significantly larger than steel as the modulus of rigidity is nearly ½ the value of carbon steel (5.6x106 psi vs. 11.5x106 psi). However, the lower modulus also dictates there will be fewer active coils in a titanium spring vs. an equivalent steel spring. The largest drawback to Titanium is the material availability and its cost typically runs 10 – 50 X that of a steel spring.

Custom Coil Spring Manufacturer

Coiling Technologies Inc. has the technical expertise, industry experience, and manufacturing capability to meet your suspension spring needs.

  • Certified ISO 9001-2015 manufacturer of custom-crafted small or large coil springs, compression springs, extension springs, suspension springs, wave springs, and torsion springs
  • More than 45 years’ experience in the spring making industry
  • Cutting-edge technology and efficient manufacturing methods to shorten production times and improve product consistency
  • Capacity to deliver any size order out of our 110,000 square-foot facility in Houston, TX from prototype runs to high-volume orders
  • On-site Coiling Technologies has other capabilities which include heat treating, powder coating, special coatings, magnetic particle inspection, shot peening, cycle testing, stamping, and wire forms.

Coiling Technologies designs and develops customized suspension springs to your requirements. Our engineers work closely with you to configure and create customized suspension springs that meet your exact specifications.  Contact us today for a quote!