Springless
Rolling Steel
Up to 18" per second. No springs. No center supports. Floor-level maintenance. Paired with the SDI Safedrive operator for safe, high-speed operation.
18″/sec
High-Speed Operation
Move doors at up to 18 inches per second — maximizing throughput and minimizing energy loss in high-traffic openings.
No Springs
Zero Spring Costs
Springless design eliminates spring replacement, center mounting supports, and the safety hazards of torsion springs.
Floor Level
Easy Maintenance
All limit and door level adjustments are made from the floor — no lift, no ladder, no climbing required.
The Springless Advantage
Traditional rolling steel doors rely on torsion springs that wear out, break, and require costly replacement. SDI's springless rolling steel design eliminates the spring entirely — delivering a durable, high-speed door system with lower lifetime cost, safer operation, and simpler maintenance.
Traditional Doors
- Springs wear out and break
- Center supports required
- Maintenance needs lift access
- Spring replacement costs
- Safety risk from spring failure
SDI Springless
- No springs to replace — ever
- No center supports needed
- All adjustments from floor level
- Lower lifetime maintenance cost
- Up to 18″/sec door speed
All components proven through many years of trouble-free high cycle applications.
Built for Performance
High-quality components paired with the SDI Safedrive operator for a safe and efficient door system — proven through years of high-cycle service.
High Speed Operation
Up to 18″ per second — maximize throughput with fast open/close cycles that keep traffic moving and reduce energy loss.
Low Maintenance Costs
No springs to replace — the single biggest maintenance expense on standard rolling steel doors is eliminated entirely.
Energy Efficient
Fast cycle speeds minimize open time, reducing heating and cooling loss in climate-controlled environments.
Floor-Level Service
Limit switches and door adjustments are accessible from the floor — no lift or ladder required.
No Center Supports
Springless design means no center mounting supports needed — simplifying installation and maximizing clearance.
Versatile Panel Options
Wide range of door face options to match the exterior of any building or project — from standard to custom.
Emergency Chain Hoist
Built-in manual override chain hoist for power outage or emergency operation — standard on every unit.
UL325 Safety Approved
UL325 approved control panel and photoreflective photocell for code-compliant safety on every installation.
Wireless Safety Edge
Air wave wireless safety edge included — no wiring to the bottom bar for a cleaner, more reliable setup.
Standard Package
Every SDI springless rolling steel door comes with these components for a complete, safe, high-performance installation.
Safedrive Operator
Reliable, proven motor system paired for consistent high-speed performance
UL325 Control Panel
UL325 approved safety control panel with full diagnostic capabilities
Photoreflective Photoeye
UL325 approved safety sensor prevents closing on obstructions
Wireless Safety Edge
Air wave safety edge — no wiring to the bottom bar
Where They Excel
Loading Docks
Fast cycle times minimize energy loss and keep goods moving efficiently through busy docks
Distribution
High-traffic shipping and receiving where every second of throughput matters
Manufacturing
Production environments with strict environmental control and high cycle-time requirements
Parking Facilities
Secure, fast access for high-volume parking structures, underground lots, and parkades
Service Centers
Busy service bays demand reliable, high-cycle doors that won't fail at peak hours
Warehousing
Temperature-controlled storage where minimizing open-time saves on energy costs
Professional Installation
As an authorized SDI dealer, Nimble Door Company provides complete turnkey installation of springless rolling steel systems across Western Canada. From specification and engineering to installation and ongoing maintenance.
SDI's local Canadian manufacturing and inventory ensure parts and service availability to minimize downtime and repair costs.
Download BrochureWhy Choose Us
Authorized SDI Dealer
Factory-trained installation and service
Canadian Made Product
Manufactured in Mississauga, Ontario
Fast Parts Availability
Local manufacturing = local inventory
Ongoing Support
Maintenance programs and emergency service
Western Canada Ready
Engineered for harsh winters and heavy use
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