Torsion springs do the lifting: wound on the torsion shaft above the door, they store the energy that balances the panel weight at the cable drums. Sizing is physics, not guesswork — torque follows τ = kt·θ (spring rate × winding angle), stored energy U = ½ktθ², and lifting force at the drum is F = τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. A zinc galvanizing layer adds corrosion protection for spring steel in humid or coastal service.
RAX winds torsion springs in-house on the same factory that makes the doors, shafts, drums and cables — so the spring rate is matched to your actual door weight and drum radius, and validated in the 100,000-cycle fatigue test lab. Cycle-life tiers (standard residential through intensive industrial) are quoted per project; SGS material reports and batch traceability ship with every lot.
Engineering relations (τ=kt·θ, U=½ktθ², F=τ/r) are verified [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. Cycle-life classes (~10,000 residential / ~25,000 commercial / 50,000–100,000+ intensive) are industry conventions [ESTIMATE]; RAX validates on its own fatigue lab. 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 | Galvanized Torsion Spring |
| Category | OEM Door Components |
| Size range | Wire diameter, inside diameter, free length and wind direction made to your door weight and drum radius — sizing follows τ=kt·θ and F=τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. Single and paired springs; single prototypes to container loads. |
| Materials | Oil-tempered spring steel wire with zinc galvanizing for corrosion protection; winding cones and set-screw fixing standard [ESTIMATE]. ASTM A229 is a common specification for oil-tempered garage-door spring steel [SOURCED https://www.amazon.com/dp/B0BRNVTKKQ]. |
| 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 is sized from torque demand: τ = kt·θ, F = τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. Give us door weight, size and drum diameter.
Specify wire gauge, inside diameter and free length — or send the old spring and we reverse-measure.
Standard duty is commonly ~10,000 cycles, commercial ~25,000, intensive 50,000–100,000+ [ESTIMATE]; choose to your cycles/day.
Confirm left/right wind and cone type (set-screw fixing standard [ESTIMATE]) so the spring mounts straight onto your shaft.
RAX supports full private-label production of the Galvanized Torsion 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.
Galvanized torsion springs are made to wire gauge, inside diameter, free length and wind direction — sized from your door weight and drum radius using τ=kt·θ and F=τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. Cycle class is quoted per duty (industry tiers ~10k / 25k / 50–100k+ [ESTIMATE]). Send your door size, weight and existing spring dimensions; RAX issues a matched specification from prototype to container-load.
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.
