High-speed roll-up doors balance their curtain weight with tension (extension-type) spring systems so the servo drive can run fast with minimum motor load. Sizing is physics: force at the balancing radius follows F = τ/r, with stored energy U = ½ktθ² in the spring system [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator] — under-sized springs overwork the drive, over-sized ones fight the brake.
RAX builds high-speed doors and their spring systems in one factory — servo motor assembly line, 100,000-cycle fatigue lab, and wind-resistance engineering that reaches Class 12 for spiral high-speed doors. Spring wire, length and end fittings are made to your curtain weight and cycle duty, with SGS material reports for every OEM order.
Balancing engineering relations are verified [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. Spring construction details for high-speed doors follow industry convention [ESTIMATE] pending per-project datasheet. RAX-specific claims are from the approved brand brief.
Custom width × height, RAL color and configuration. Large industrial doors from prototype to container-load, full flexibility on order quantity.
Validated against a 100,000-cycle fatigue testing protocol in our in-house lab.
ISO 9001:2015 and CE to EN 13241 / EN 12453, with SGS material reports.
English manual + wiring diagrams; operators pre-set before dispatch.
| Product | High Speed Door Tension Spring |
| Category | OEM Door Components |
| Size range | Tension spring made to your curtain weight, travel and cycles/day; wire gauge and length engineered per door. Compatible with RAX high-speed door systems (wind resistance up to Class 12 on spiral doors) and third-party assemblies. |
| Materials | Spring steel wire with corrosion protection; double-loop or custom end fittings [ESTIMATE]; matched to PVC-coated fabric curtains 0.9–1.2 mm or aluminum curtain constructions. |
| Color / finish | Full RAL custom (common RAL9006 / 9010 / 7016 / 5010), wood-grain, PVDF, anodizing |
| Power | Not applicable — passive, unpowered component. RAX can supply matched operators, servo drives and smart controls from its full-category one-factory range. |
| Certification | CE EN 13241 / EN 12453; product-specific test data confirmed per project |
| Order | Custom engineered to your exact opening, specification and RAL color |
The spring balances the curtain: give curtain material, size and weight — force follows F=τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator].
High-speed doors run thousands of cycles; specify cycles/day so wire gauge targets the right fatigue class.
RAX pairs springs with its own servo drive line — balanced systems cut motor heat and extend service.
Double-loop ends and containment are standard conventions [ESTIMATE]; confirm fitting type against your track.
RAX supports full private-label production of the High Speed Door Tension Spring: custom RAL panel colors, operator matching, packaging printing and installation-manual translation (EN/ES/FR/AR/RU). Start with an OEM sample and scale to container-load branded production. Custom molds, Tooling records are archived for up to 5 years — no extra tooling fee on repeat orders, all under strict NDA.
Industrial, commercial and garage doors and gates — the harmonized basis for CE marking.
Safety in use of power-operated doors — force limits and test methods for operators.
Wind (EN 12424), thermal (EN 12428), fire (EN 1634-1) etc. confirmed per product during enrichment.
High-speed door tension springs are made to your curtain weight, travel and cycles/day, with force engineered from F=τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. They pair with RAX high-speed door systems — wind resistance up to Class 12 on spiral doors — or third-party assemblies. Send your door model and duty cycle; RAX quotes from prototype to container-load, small batches OK.
We are a pure manufacturer and do not provide on-site installation. Every order ships with an English installation manual, wiring diagrams for your local installation team; operators are pre-set and tested before dispatch.
RAX holds ISO 9001:2015 and CE to EN 13241 (industrial door product standard) and EN 12453 (operator safety), with SGS material reports and product liability insurance. Components are engineered to help the finished door satisfy EN 12604 (mechanical aspects: strength, cycle durability, finger-pinch and spring/cable safety), and product-specific test data (fire, wind, thermal) is confirmed per project against the matching standard.
Yes. RAL panel colors, operator matching, packaging printing and manual translation (EN/ES/FR/AR/RU) are all supported, from an OEM sample to container-load branded production.
Sample 7–15 days; standard container 12–20 days; custom first order 20–35 days. Door body 2-year warranty, operator/motor 3 years (servo 5 years), with spare parts dispatched by DHL/FedEx within warranty.
Factory inspection report, 100,000-cycle fatigue test record, FAI / pre-assembly photos, English installation Manual + Wiring diagrams, CE Declaration of Conformity, and export packing (steel frame + pearl cotton + stretch film).
Or email info@raxdoor.com
Send your opening size and duty requirements — we reply with a proposal and lead time.
