Starter motor brush holders
Used to maintain brush pressure against the commutator while fitting into limited holder space. Geometry control helps support consistent electrical contact during starter operation.
Product Brief
Supplier-facing product scope with RFQ-ready context.
This category reflects one of the company's reported strengths in starter and generator-related spring manufacturing.
- Family: Carbon Brush Spring
- Material Range: Spring steel wire for brush-force stability, Surface-protected wire where corrosion risk exists
- Application Fit: Focused on starter motor brush-holder force stability and electrical brush contact consistency.
- RFQ Suitability: Appropriate for RFQs that specify brush force, installation envelope, and cycle or vibration concerns.
Product Overview
Custom starter carbon brush spring support for brush holder assemblies.
Starter carbon brush springs are used in starter motor brush holder assemblies to maintain stable brush contact pressure during motor operation. QIFENG manufactures custom carbon brush springs based on drawings, samples, or installation conditions, supporting automotive and motorcycle starter motor applications where force stability, repeatable geometry, and batch consistency are important.
- IATF 16949 & ISO certified manufacturing
- 3-5 day rapid sampling for qualified designs
- Drawing, sample, or sketch based customization
- Small MOQ available for sourcing validation
- Stable lead time and OEM/ODM support
- Reverse engineering for discontinued spring parts
Technical Specification
Typical Specification Range
| Product type | Carbon brush spring / brush holder spring |
|---|---|
| Application | Starter motor, DC motor, automotive electrical assemblies |
| Material | Spring steel wire / stainless steel / surface-protected wire, subject to drawing |
| Wire diameter | Customized according to drawing or sample |
| Surface treatment | Zinc plating, nickel plating, phosphating, oiling, or as required |
| Key control points | Installed force, free height, leg angle, contact position, fatigue performance |
| Production mode | OEM/ODM, drawing-based, sample-based, reverse engineering |
| Sample lead time | 3-5 days, depending on structure and material |
| MOQ | Small-batch customization available |
| Quality support | IATF 16949 and ISO system support |
Application Context
Where starter carbon brush springs are usually reviewed.
Brush pressure retention systems
Suitable when the buyer needs an installed force range and wants to reduce force loss after repeated operation. Sampling can focus on vibration and temperature-related force stability.
DC motor contact-force control
Supports stable current transfer by keeping contact pressure more consistent. Sample testing before batch production helps confirm whether the spring shape and force target match the motor assembly.
Automotive electrical starting assemblies
Applied in automotive and motorcycle starter motor systems where batch consistency matters. Traceable production and inspection records help purchasing teams manage repeat orders.
Manufacturing Notes
Process controls that affect brush pressure and repeatability.
CNC forming for repeatable brush geometry
Forming focuses on wire shape, leg angle, and installed contact position so each lot can match the brush holder envelope more consistently.
Heat treatment / tempering for force retention
Tempering is selected around spring force stability and elastic recovery, which matters when the spring must maintain brush pressure over repeated starter cycles.
Dedicated force checking on sample lots
Sample review can check free-state dimensions and installed-condition force. Force records can be kept by lot before the order moves into batch production.
Packaging arranged to avoid distortion in transit
Carbon brush springs are small and easy to deform. Lot separation, anti-pressure packing, and mixed-part avoidance help protect shape before assembly.
Inspection Focus
What the supplier review usually needs to confirm before release.
- Installed brush force and force tolerance
- Free height and working height
- Leg angle and contact position
- Shape repeatability across batch lots
- Surface condition and cleanliness
- Elastic recovery after installation
- Lot traceability and inspection records
- Packaging condition before shipment
RFQ Checklist
What to Send for a Faster Quotation
Spring drawing, brush holder drawing, or clear sample photos
A holder reference helps confirm the installed contact position and available space.
Target installed force or working height
Force targets make the quotation more useful than free-shape dimensions alone.
Material and surface treatment requirements
Share plating, oiling, corrosion, or cleanliness needs early.
Application type
Tell us whether it is for a starter motor, alternator, DC motor, or other brush assembly.
Sample quantity and annual demand
This helps align sampling, tooling review, and batch production planning.
Special testing requirements
Mention fatigue, vibration, salt spray, or other validation needs if they apply.
Packaging or shipment requirements
Small brush springs may need separation or anti-deformation packing.
Why Qifeng
Why Source Carbon Brush Springs from Qifeng
- Automotive and motorcycle spring manufacturing experience
- Drawing, sample, and sketch-based customization
- Reverse engineering for discontinued spring parts
- 3-5 day rapid sampling for qualified designs
- Small-batch and OEM/ODM production support
- IATF 16949 and ISO quality system support
Related Sourcing Pages
Internal references for brush spring and automotive spring RFQs.
Buyer Note
Clarify the working condition, not only the nominal shape.
Brush spring RFQs are stronger when the installed-force condition is stated directly. Free-shape dimensions alone rarely capture the application requirement.
Automotive Springs
Representative Product Visuals
Related Products
Nearby product references for the same RFQ conversation.
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Product RFQ
Submit starter carbon brush spring details for quotation review.
Send your drawing, sample photo, quantity, and application details. Our team will review the spring structure, installed force requirement, material choice, and sample feasibility before quotation.
Engineering RFQ
Product RFQ
Send the core RFQ details first. Add technical details only if they are already ready.
- Drawing or sample photo
- Quantity and application