Custom Mainspring Manufacturer
Flat spiral mainsprings engineered for controlled energy storage and long service life
What Is a Mainspring
Mainsprings serve as the primary energy storage component in mechanical systems, delivering controlled torque for precise rotational motion
Engineering Definition
Primary energy storage spring in a mechanical system that stores potential energy through spiral winding
Typically manufactured as a flat spiral spring wound from pre-hardened strip material
Provides controlled torque output for downstream mechanisms requiring rotational power
Delivers consistent rotational travel across multiple wind/unwind cycles
Ensures energy release stability critical for precision timing and mechanical drive applications
Need precise torque control for your mechanical system?
Discuss Your RequirementsMainspring vs Clock Spring vs Power Spring
Understanding the differences helps you select the right energy storage solution for your application
Unsure which spring type fits your application?
Get Technical RecommendationTypical Applications of Mainsprings
Mainsprings power critical functions across diverse mechanical systems where controlled energy storage matters
Mechanical Timing & Drive Systems
Powers escapement mechanisms, gear trains, and regulated motion control where battery-free operation is required
Rewind & Return Mechanisms
Drives automatic cable retraction, cord reels, and retractable assemblies requiring consistent pull-back force
Energy Storage Units
Stores mechanical energy for backup actuators, emergency release systems, and power-fail safety devices
Spring-Driven Gear Systems
Enables compact mechanical drive solutions in instruments, meters, and positioning devices without electric power
Need mainsprings for a specialized application?
Share Your Use CaseTypes of Mainsprings We Manufacture
We engineer mainsprings across multiple structural configurations to match your exact installation and torque requirements
By Installation Method
Arbor Mounted
Inner end fixed to central shaft, outer end free to rotate within housing
Barrel Housed
Enclosed in protective drum with outer end fixed to barrel wall
Dual-End Fixed
Both inner and outer ends anchored to separate rotating elements
By Torque Requirement
Low Torque / Long Duration
Thin strip material with extended coil count for sustained low-power output
Medium Torque / Balanced Output
Standard thickness with optimized width for general-purpose mechanical drives
High Torque / Compact Design
Thick strip with reduced coil count for maximum torque in limited space
Need help selecting the right mainspring configuration?
Get Configuration GuidanceKey Design Parameters for Custom Mainsprings
These critical dimensions and specifications determine mainspring performance, reliability, and fit in your assembly
Strip Width & Thickness
Defines torque capacity and spring stiffness. Wider strips deliver more torque; thickness controls stress levels and fatigue life.
Number of Active Coils
Determines total rotation angle and energy storage. More coils = longer run time but larger envelope.
Initial / Working / Maximum Torque
Torque at fully wound, mid-wind, and near-release positions. Critical for matching load requirements across operating range.
Total Rotation Angle
Number of turns from fully wound to released state. Drives mechanism travel distance and energy delivery duration.
Installation Constraints
Drum diameter, arbor size, clearances, and fixation methods. These boundaries shape the feasible design space.
Target Service Life
Expected cycles before fatigue or permanent set occurs. Influences material selection and stress limits in design.
Ready to specify your mainspring parameters?
Start Design DiscussionMaterial Options for Mainsprings
Material choice directly impacts torque consistency, service life, and environmental resistance in your mainspring application
High Carbon Spring Steel
Maximum strength and energy storage for demanding torque applications
Stainless Steel
Corrosion resistance for humid or chemical exposure environments
Pre-Tempered Alloy Steel
Consistent mechanical properties reduce process variation
Custom Strip Materials
Specialty alloys for extreme temperature or unique applications
Critical Performance Factors
Unsure which material suits your operating conditions?
Get Material RecommendationHeat Treatment & Stress Control
Proper heat treatment is the core process ensuring mainspring torque consistency, residual stress management, and long-term stability
Heat Treatment Impact
Torque consistency controlled through precise temperature curves preventing output variation across production batches
Residual stress management eliminates internal forces that cause dimensional drift and premature failure
Long-term stability achieved through stress relief cycles preventing torque relaxation over service life
Need verification of heat treatment protocols?
Request Process DocumentationManufacturing Process
Our mainspring production follows controlled steps ensuring dimensional accuracy and consistent mechanical properties
Strip Preparation
Material inspection and dimensional verification
Precision Forming & Coiling
Controlled winding to target geometry
Heat Treatment
Temperature-controlled stress relief
Torque Setting
Calibration to specification range
Final Inspection
Dimensional and functional verification
Want to audit our manufacturing capability?
Schedule Factory VisitTorque & Life Testing
Mainsprings require specialized testing protocols beyond standard spring verification to ensure performance reliability
Torque Testing Under Controlled Speed
Measure torque output at defined rotation velocities matching actual operating conditions
Cycle Life Testing
Accelerated wind/unwind cycling to predict service life and identify failure modes
Consistency Verification
Statistical process control ensures batch-to-batch repeatability of torque characteristics
Need detailed test reports with your order?
Request Testing ProtocolPrototyping & OEM Replacement Support
We support both new design development and legacy part replacement with flexible manufacturing approaches
Drawing-Based Manufacturing
Provide your engineering drawing and we manufacture to specification with full dimensional verification
Sample-Based Reverse Engineering
Send existing mainspring and we measure, replicate, and optimize for manufacturability
Small Batch Validation
Produce limited quantities for fit-testing and functional verification before committing to full production
Ready to prototype your mainspring design?
Start Prototyping ProjectCommon Mainspring Design Problems We Help Avoid
Our engineering review catches these frequent issues before they become production failures
Over-Stressing at Full Wind
Exceeding material yield strength during maximum deflection causes permanent set and torque loss
Results in immediate performance degradation and shortened service life
Torque Drop Over Service Life
Inadequate stress relief or improper material selection leads to relaxation under sustained load
System performance drifts outside specification window within months
Improper Housing Clearance
Insufficient radial or axial space causes binding, friction, or coil interference
Unpredictable torque delivery and potential mechanical jamming
End Fixing Failure
Weak attachment points or incorrect hook geometry create stress concentrations
Fatigue cracks initiate at fixation points leading to catastrophic separation
Concerned about design reliability?
Get Engineering ReviewHow to Get a Quote
Provide these key details for accurate mainspring quotation and lead time estimation
Information We Need
Drawing or physical sample showing dimensions, material, and configuration
Torque & rotation requirement defining initial, working, and maximum torque with angular travel
Installation method specifying arbor mount, barrel housing, or dual-end fixing
Target life cycles indicating expected wind/unwind repetitions over product lifetime
Get Engineering Quote
Describe your requirements and our engineers will respond within 24-48 hours
Contact EngineeringNot sure what information to provide?
Speak with Application EngineerMainspring FAQ
Mainspring is a broader term for primary energy storage springs in mechanical systems. Power springs specifically optimize for maximum torque density in compact spaces, typically with rapid release characteristics. Mainsprings include power springs but also cover longer-duration, lower-torque applications like timing mechanisms.
Yes, torque curves can be engineered through variable strip thickness, tapered geometry, or material heat treatment variations. This allows us to flatten torque output across the wind angle or create specific torque profiles matching your application requirements. We provide torque-angle curves with sample approvals.
Samples: 7-10 days after drawing approval. Production runs: 3-4 weeks depending on quantity and complexity. Rush service available for critical projects with 2-3 day sample turnaround at additional cost.
No MOQ for sampling and prototyping. Production MOQ starts at 500 pieces for standard configurations, 1000 pieces for custom geometries. We support small-batch validation runs (50-100 pieces) before full production commitment.
Yes, we sign mutual NDAs as standard practice. All customer drawings, specifications, and application details are treated as confidential. We maintain strict document control and do not disclose project information to third parties.
Have more questions about mainspring design or manufacturing?
Contact Engineering TeamSend us your mainspring drawing or performance requirement
Our engineers review every project before production
Get Engineering Quote