Spring Steel Compression Spring（Y-type Pressure Spring）Wire Diameter 0.3 – 0.9 mm

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1. Performance
   • Gentle, Progressive Force Curve – Y-type pressure geometry combined with fine wire diameters Ø0.3 – 0.9 mm delivers low-to-medium spring rates (≈ 0.02 – 0.80 N mm⁻¹). Force builds smoothly along the stroke, cushioning delicate components while ensuring reliable return.
   • High-Elasticity Metallurgy – Options include cold-drawn music wire (ASTM A228) for maximum energy density or 304/316 stainless for corrosion-critical environments. Both undergo oil tempering and dual stress-relief at 250 °C, achieving 1 300 – 1 750 MPa tensile strength with <2 % permanent set after 100 000 cycles.
   • Versatile Dimensions – Outer diameters Ø3 – 15 mm and free lengths up to 200 mm support miniature tactile buttons through to light shock-absorbing mounts. Variable-pitch or conical coils can be specified for progressive load curves or shortened solid heights.
   • Stable Across Temperatures – Modulus variation remains within ±3 % from −40 °C to +120 °C; optional heat stabilization to 300 °C keeps load drift below 3 % for continuous high-temperature duty.
2. Application Scenarios & Assembly Requirements
   • Precision Returns – Ideal for microswitches, syringe pumps, camera shutters, and laboratory pipettes where low preload prevents seal damage or trigger fatigue.
   • Light Shock Absorption – Serves as miniature bump-stops in robotics joints, drone landing gear, sensor probes, and wearable devices, dissipating kinetic energy without harsh recoil.
   • Assembly Guidelines
   – Guide Clearance: bore ID = spring OD + 0.10 × wire Ø to avoid side-load buckling.
   – Working Stroke: cap compression at 80 % of solid height to maintain ≥ 95 % initial load over one million cycles.
   – End Style: squared & ground ends ensure axial load concentricity; closed-unground ends suit plastic seats with generous pockets.
   – Custom Profiles: barrel or telescopic versions mitigate resonance or allow nesting where axial space is limited.
3. User-Friendly Operation
   • Pre-Scragged & Ready – Each spring is compressed to solid during production and re-set, so catalog forces are valid immediately—no run-in period required.
   • Clean Handling – Stainless variants withstand ultrasonic or solvent cleaning for sterile builds; carbon-steel versions arrive lightly oiled in anti-static trays to prevent tangling.
   • Quick Identification – Epoxy color dots on one coil encode wire size and spring rate, speeding up line-side sorting and maintenance swaps.
   • Tool-Free Installation – Small sizes can be seated by fingertip pressure; longer coils slide over simple mandrels—no specialty compressors or lubricants necessary.
4. Quality & Longevity
   • ISO 9001 & IATF 16949 Manufacturing – Statistical process control on wire drawing, coil pitch, and heat treatment holds force tolerance to ±6 % and free-length tolerance to ±0.5 mm.
   • Proven Fatigue Life – Laboratory tests show <4 % load decay after 1 000 000 cycles at 60 % solid height; shot-peened surfaces reveal no micro-cracks under metallography.
   • Surface Protection Choices – Passivation (ASTM A967), black oxide, clear zinc, or PTFE dry-film coatings (≤ 8 µm) extend neutral salt-spray resistance to 72 – 120 h without altering spring rate.
   • Full Traceability – Laser-etched batch codes link each spring to 3.1 material certificates, load/deflection graphs, and RoHS/REACH compliance records, guaranteeing predictable performance for OEM, medical, and aerospace applications.