Closed Ground End Compression Spring Flatness 0.1mm for Precision Assembly
Closed ground end compression springs with flatness ≤0.1mm and perpendicularity ≤0.5° ensure stable, side-load-free force output for precision assembly applications.
Compression Spring Quick Detail
Essential for valve spools, plungers, and applications requiring vertical spring seating. Our compression springs feature ground flat ends with flatness ≤0.1mm and perpendicularity ≤0.5° to prevent tilting and mating surface wear during compression. Custom wire diameter, OD, and spring rate available with 48-hour sampling and small batch orders welcome.
Compression Spring Product Description
Many mechanical failures originate from spring end misalignment. When spring ends are not parallel, compression generates lateral forces that cause guide wear, seal eccentric wear, or spring buckling. The closed & ground process—closing the last two coils tightly and grinding them perpendicular to the axis—fundamentally solves this issue.
Tingfeng Hardware uses double-face simultaneous grinding to process both ends at once, ensuring parallelism and perpendicularity. We utilize optical flatness gauges to achieve flatness within 0.05mm. For special requirements requiring extremely high flatness for minimal clearances, we offer precision grinding services. Whether for solenoid valve armature springs or force-transmission springs in precision regulators, our ground-end springs provide stable, side-load-free force output. With 15 years of experience and IATF16949 certification, quality is assured.
Compression Spring Features & Advantages
| Feature |
Advantage to You |
| Double-face simultaneous grinding |
Ensures parallel ends; no side load during compression, extending guide life |
| Flatness ≤0.1mm (standard) |
Spring seats stably; ideal for precision mating surfaces like valve seats and stops |
| Perpendicularity ≤0.5° |
Prevents spring-to-bore friction, reducing noise and vibration |
| Custom Rate & Size |
Designed exactly to your load and space requirements—no compromise with standard stock |
| Small Batch & Rapid Sample |
48-hour sampling, orders from 100 pieces, no tooling fee |
Compression Spring Specifications
| Specification Item |
Detail / Capability |
Notes / Description |
| Wire Diameter |
0.3mm - 3.0mm |
Very fine wires prone to grinding deformation |
| Outer Diameter |
3mm - 30mm |
Fixture compatible |
| Free Length |
5mm - 120mm |
Minimum 2 closed coils required on each end |
| Flatness |
≤0.1mm (standard) / ≤0.05mm (precision) |
Measured with optical flat |
| Perpendicularity |
≤0.5° |
Relative to spring axis |
| Material |
Music wire, SUS304, SUS316, Chrome silicon |
All grindable materials |
| Surface Finish |
Natural / Zinc / Nickel plated |
Applied after grinding process |
| Sample Lead Time |
3-5 days (with grinding) |
Grinding adds 1-2 days to process |
Compression Spring Applications
- Solenoid Valves & Pneumatic Components: Return springs for valve spools; ensure uniform seal contact, preventing leakage
- Precision Regulators & Pressure Reducing Valves: Springs used as force reference in adjustment mechanisms requiring accurate, non-side-load force
- Test Probes & Connectors: Spring probes for IC test sockets and battery connectors requiring smooth compression
Frequently Asked Questions
Can you handle complex custom designs and provide design optimization suggestions?
Absolutely. This is our core expertise. We provide free DFM analysis within 3-5 days, often helping clients achieve 15-30% cost reduction through design for manufacturability.
How do you ensure quality consistency and handle defect issues?
We implement a rigorous 4-stage QC system with 100% full inspection. Our track record shows 99.99% qualification rate.
What are your lead times and how do you handle urgent orders?
Standard lead times: 3-7 days for prototypes, 7-15 days for mass production. We offer VIP prioritization cutting lead times by up to 30%.
Will I get timely responses and professional support throughout the project?
Yes. You get a 1v1 exclusive consultant with 1-hour initial response commitment and 24-hour technical support.
Can you provide material certifications and environmental compliance reports?
Yes. We provide material certifications and environmental test reports (RoHS, REACH compliant) upon request.
How do you protect my designs and intellectual property?
We start with mutual NDA and implement strict mold ownership protection and confidential data security measures.
What are your payment terms and MOQ requirements?
We offer flexible payment terms (T/T, L/C at sight) and MOQ from 1 piece for prototyping.
