Custom OEM Titanium Suspension Springs Factory & Suppliers

For extreme-stroke chassis suspension springs (motorsport coilover shocks, downhill mountain bikes, and snowmobile suspensions), Metastable Beta Titanium alloys such as Beta-C (Ti-3Al-8V-6Cr-4Mo-4Zr / Grade 19) and Ti-15V-3Cr-3Sn-3Al are the gold standard. When solution heat-treated and aged (STA), Beta-C achieves yield strengths above 1,300 MPa with a lower shear modulus ($G \approx 40\text{ GPa}$) than Ti-6Al-4V ($G \approx 43\text{ GPa}$). This maximizes deflection without coil-bind. For smaller valve springs or low-stroke actuation springs, standard Grade 5 Ti-6Al-4V (TC4) is widely employed due to its exceptional strength-to-weight ratio and elevated thermal resilience up to 400°C.

Permanent setting occurs when localized shear stress during maximum stroke exceeds the proportional elastic limit of the material. At Velnora, we eliminate this through a rigorous hot and cold scragging (pre-setting) process. After vacuum aging and shot peening, the springs are compressed beyond their solid height multiple times under controlled thermal conditions. This induces beneficial residual stresses that counteract operating torsional loads. Once scragged, our titanium springs exhibit zero settling loss across tens of thousands of race cycles.

Yes, provided internal damper clearance and stroke are accounted for. Because titanium's shear modulus is roughly half that of steel, the wire diameter ($d$) of a titanium spring must be slightly thicker, or the active coil count ($n$) adjusted to match the exact steel spring rate ($k$). Consequently, outer diameter ($OD$) and solid height ($H_s$) can differ. Velnora's engineering team provides full 3D CAD clearance checks (STEP/IGES) to verify that the spring clears the shock body, reservoir piggyback, and mounting preload collar collars without rubbing.

Spring surge is a dangerous harmonic phenomenon where dynamic stress waves bounce back and forth between the spring ends, causing surging internal loads, valve float, and premature fatigue rupture. Because the natural frequency of a spring is governed by $f_n \propto \sqrt{k/m}$, reducing the mass of the spring by ~50% shifts the natural resonance frequency to a much higher spectral range. This places the surge harmonics far above the maximum cycle frequencies generated by vehicle chassis motions or engine valve speeds.

Titanium naturally forms a tough, self-healing titanium dioxide ($\text{TiO}_2$) passivation film, rendering it completely impervious to road salt, mud, moisture, and chemical washes. For aesthetic identification and surface hardness, we offer electrolytic anodizing (available in royal blue, gold, purple, bronze, and teal), PVD (Physical Vapor Deposition) ceramic coatings (TiN gold, TiAlN charcoal, Rainbow spectrum), and Micro-Arc Oxidation (MAO) for ultra-tough ceramic abrasion resistance.

For standard custom suspension springs where tooling is calibrated, rapid prototype samples can be completed, scragged, and dyno-verified within 7 to 10 business days. Typical production MOQs range from 10 to 50 pieces per spring rate specification for race teams and boutique suspension builders. For high-volume automotive OEM supply agreements, our factory scales production to thousands of units monthly with full material test certificates (MTR according to EN 10204 3.1) and live video inspection prior to shipment.