Coil cord dimensions are driven by application requirements, extension behavior, and material selection. Dimensional targets should be established early to ensure consistent retractability, durability, and long-term performance.
Typical Dimensional Ranges
Coil cords are commonly produced within the following reference ranges:
- Cable Outside Diameter (OD): approximately 0.090″ – 0.450″
- Retract Length: approximately 1″ – 60″
- Extended Length: approximately 5″ – 300″ (typically designed at a 5:1 extension ratio)
- Tail Length: approximately 1″ – 250″ (axial or tangential)
Actual dimensions vary based on construction and application.
Extension Ratio and Performance
Extension ratio influences retractability, memory, and fatigue life.
- Higher ratios increase extension length but raise mechanical stress
- Moderate ratios improve long-term durability
- Ratios are selected based on motion severity and service life expectations
Proper balance ensures consistent recoil and minimal permanent set.
Mechanical Considerations
Dimensional design should account for:
- Frequency and severity of extension
- Bend radius during use
- Routing and termination requirements
- Abrasion and environmental exposure
Smaller diameters generally improve flexibility, while larger diameters may improve durability.
Engineering Support
Dimensional targets are best refined through application review. Gavitt works with customers to evaluate space constraints, motion profiles, and performance requirements and to recommend appropriate dimensional ranges.