This precision cylindrical compression spring is a core custom machined part supplied by our factory, crafted from premium 304 stainless steel spring wire via full CNC spring coiling process. We implement dual surface treatment: solid solution passivation as the anti-corrosion base layer, followed by electrolytic polishing to deliver flawless mirror bright metal appearance. Both ends are precisely flat ground to ensure vertical fitting during assembly, paired with stress-relief tempering to lock consistent elastic output. As a professional OEM custom manufacturer, we accept drawings and samples to produce small stainless steel pressure springs with flat ends, meeting strict precision assembly requirements for diverse civilian industrial machinery. Every batch undergoes dimensional sorting and elastic force testing before delivery to guarantee stable, reliable performance for long-term industrial use.

1. Wire Straightening
2. CNC Coil Forming
3. Double End Flat Grinding
4. Stress Relief Tempering
5. Passivation
6. Electropolishing
7. Sorting & Force Inspection
8. Packing

Our custom stainless steel compression spring, precision cylindrical coil spring and mirror polished compression spring are widely applied in civilian precision industries:

• Small automated office equipment
• Household smart home appliances
• Medical miniature precision instruments
• Electronic consumer hardware components
• Automated transmission mini actuators
• Testing & measuring laboratory equipment
• Light industrial assembly fixtures
• Environmental protection small mechanical valves

As a professional custom compression spring manufacturer, we provide full OEM custom service for all types of precision cylindrical coil springs:

• Custom processing per customer technical drawings, physical samples or performance parameter requirements
• Customize wire diameter, outer diameter, free length, coil count, load force and flat end size to match assembly demands
• Custom surface treatment solutions: passivation, mirror electropolishing, matte polishing upon request
• Custom material selection: 304, 316 stainless steel spring wire for different anti-corrosion environments
• Custom batch production: small trial order batches and mass volume OEM orders supported
• Custom packaging solutions for brand export independent store sales

• Dull spring surface & easy rust → Solution: Dual passivation + mirror electropolish treatment, long-lasting anti-rust performance and high-gloss mirror appearance for high-end product assembly.

• Uneven spring ends, unstable assembly fit → Solution: Double-sided flat grinding process, perfect vertical flat contact without assembly wobble.

• Unstable elastic force, fatigue failure quickly → Solution: Post-forming stress relief tempering eliminates internal stress, maintains consistent elasticity under repeated compression.

• Low dimensional accuracy, hard to match precision equipment → Solution: CNC full-automatic coiling machine, ±0.02mm tight tolerance, strict dimensional sorting inspection.

• Hard to find reliable custom OEM manufacturers for small pressure springs → Solution: Professional CNC spring factory with full in-house production line, one-stop custom service from design to finished export products.

• Raw material incoming inspection: 304 stainless steel wire hardness & composition test before production
• In-process real-time monitoring: CNC coiling size real-time calibration to control tolerance
• Post-grinding verticality inspection for flat ends
• Stress relief tempering temperature curve quality tracking
• Finished product full dimensional sorting: length, outer diameter, wire diameter, coil quantity screening
• Elastic load force testing machine inspection for compression performance consistency
• Surface finish visual inspection for mirror polishing uniformity and passivation anti-rust layer integrity
• Random sampling aging compression fatigue test for long service life verification
• Export-grade clean packaging inspection to avoid surface scratch damage during transportation