Extension Springs
Custom Extension Springs With Drawing-Based Hook Designs
Extension springs are manufactured around coil body dimensions, initial tension, overall length, hook geometry, material selection and working load requirements. Built for OEM buyers who need drawing review, material selection, inspection planning and a clear RFQ path.
Product and Engineering Review
Extension springs are manufactured around coil body dimensions, initial tension, overall length, hook geometry, material selection and working load requirements.
| Spring type | Extension springs with loops, hooks, extended ends or drawing-specific end forms. |
|---|---|
| Quote basis | Body length, outside diameter, wire diameter, hook shape, initial tension, working load, material and quantity. |
| Custom dimensions | Free length and overall length are confirmed from the assembly drawing or sample. |
| Materials | Carbon steel, stainless steel, music wire, phosphor bronze and other project-specific materials for review. |
| Finish review | Plating, passivation or finish requirements should be included with the RFQ when needed. |
| Testing | Dimensional inspection, hook geometry checks and load testing can be planned. |
| Production route | CNC coiling/forming, heat treatment, end forming, sorting and inspection planning. |
| Files | PDF, DWG, DXF, STEP, sample photos or a dimension sketch can start the RFQ review. |
| Production wire range | 0.1-4.0 mm production wire diameter range for project screening; drawing-specific feasibility is still reviewed by spring type, material and geometry. |
| Tolerance basis | Tolerance is confirmed by drawing, critical dimensions, material and inspection requirements because custom spring designs vary by geometry and function. |
| Lead time basis | Quotation, sample timing and production delivery are confirmed after drawing, material, quantity and inspection requirements are reviewed. |
RFQ details that speed up review
- Drawing or sample photos with critical dimensions marked.
- Material, finish, quantity target and application environment.
- Load, torque, contact pressure or functional requirement if available.
- Inspection report, packing or batch documentation needs.
Manufacturing Review
- Check hook orientation, stress concentration and assembly pull direction before quoting.
- Review initial tension and working extension so the spring does not exceed intended travel.
- Plan end forming and inspection points for repeatable batch production.
Typical Applications
- Latches, handles, locks and return mechanisms.
- Furniture, fixtures and appliance assemblies.
- Industrial controls, small mechanisms and consumer hardware.
Quality Checks
- Overall length, body length, hook angle and coil body dimensions can be checked.
- Load at specified extension can be tested for project requirements.
- Packing requirements can be reviewed to protect hooks during shipment.
Manufacturing Capability Basis
These capability figures support early RFQ screening. Final manufacturability, tolerance and delivery timing still depend on the drawing and order requirements.
Custom Spring Manufacturing Process
Each project is reviewed from the drawing, sample or application requirement before sampling and production planning.
Drawing Review
Confirm dimensions, function, material and missing RFQ details.
DFM Review
Check forming, coiling, springback, stress and assembly risks.
Sample Planning
Prepare sample route and inspection points for engineering review.
Production Setup
Plan coiling, forming, heat treatment, sorting and packing needs.
Inspection
Review dimensional, load, torque or functional checks by project.
Related Pages for Extension Springs Buyers
Send custom extension springs drawings for review.
Share your drawing, sample photos, material, quantity and application notes so the project can be checked against manufacturing and inspection requirements.
Frequently Asked Questions
What information do you need to quote custom extension springs?
A drawing, sample photo or sketch is the best starting point. Please include material, wire diameter or thickness, critical dimensions, quantity, application and any load, torque, contact or inspection requirements.
Can you manufacture from a drawing or sample?
Yes. The RFQ can start from PDF, DWG, DXF, STEP files, sample photos or a dimension sketch. Missing details should be confirmed before sampling.
Which materials are available?
Common review options include carbon steel, stainless steel, music wire, phosphor bronze and brass, depending on the spring type and application requirements.
Can you provide load, torque or dimensional inspection?
Dimensional checks, load testing, torque checks and inspection reporting can be planned when the drawing or project requires them.
Do you support samples before production?
Sample review can be planned before larger production, especially when the part is custom, compact or function-critical.
What should be confirmed before mass production?
Confirm final drawing revision, material, finish, quantity, inspection standard, packing method and any application-specific risks before batch production.