Oil-tempered (oil-quenched and tempered) spring steel is the standard wire for overhead-door torsion springs, balancing high elastic limit with fatigue life; ASTM A229 is a common specification for oil-tempered garage-door spring steel, used in real retail springs such as a double-looped 140 lb / 7 ft rated product [SOURCED https://www.amazon.com/dp/B0BRNVTKKQ]. Sizing is engineering, not catalog luck: torque τ = kt·θ, stored energy U = ½ktθ², drum force F = τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator].
RAX winds oil-tempered torsion springs in the same factory as the doors, shafts, drums and cables they balance, then validates them in a 100,000-cycle fatigue test lab. Galvanized or coated finishes are available for corrosion duty, cones come with standard set-screw fixing [ESTIMATE], and every lot ships with SGS material reports and a traceable batch number.
ASTM A229 usage and the 140 lb / 7 ft retail example are verified from a real product listing [SOURCED https://www.amazon.com/dp/B0BRNVTKKQ]; engineering relations are verified [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]. Cycle-life tiers (~10k / 25k / 50–100k+) are industry conventions [ESTIMATE]. 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 | Oil-Tempered Torsion Spring |
| Category | OEM Door Components |
| Size range | Wire diameter, inside diameter, free length and wind direction produced to your door weight and drum radius (sizing per τ=kt·θ, F=τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]). From prototype to container-load delivery. |
| Materials | Oil-tempered spring steel wire (ASTM A229 is the common spec for this class [SOURCED https://www.amazon.com/dp/B0BRNVTKKQ]); optional zinc galvanizing or coating for corrosion; winding cones with set-screw fixing [ESTIMATE]. |
| 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 |
Oil-tempered steel is the industry standard for torsion springs; ASTM A229 is a common spec [SOURCED https://www.amazon.com/dp/B0BRNVTKKQ].
We size from door weight and drum radius: τ = kt·θ, F = τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator].
Match wire gauge and shot-peening/finish to cycles/day — tiers ~10k / 25k / 50–100k+ are industry convention [ESTIMATE].
Bare oil-tempered for indoor; galvanized or coated for humid/coastal — specify the environment.
RAX supports full private-label production of the Oil-Tempered 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.
Oil-tempered torsion springs are produced to wire gauge, inside diameter, free length and wind direction, sized from your door weight and drum radius (τ=kt·θ, F=τ/r [SOURCED https://www.firgelliauto.com/blogs/engineering-calculators/torsional-spring-calculator]). ASTM A229 is the common oil-tempered spec [SOURCED https://www.amazon.com/dp/B0BRNVTKKQ]. Send door size/weight or a sample spring; RAX quotes from prototype to container-load with cycle class matched to your duty.
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.
