DIN137A Belleville Washer Conical Disc Spring Cup Washers 18-8 Stainless Steel

description

1. Consistent, Corrosion-Proof Spring Performance
   • Produced to DIN 137 Type A geometry from austenitic 18-8 stainless steel (≈ 304), each conical disc delivers a predictable load curve of 0.4 – 1.5 kN at 75 % deflection while remaining stable from −200 °C to +300 °C.
   • The non-magnetic, 18 % Cr / 8 % Ni alloy resists pitting, crevice attack, and atmospheric staining in marine spray, food-processing condensates, and de-icing brine—no additional plating required.
   • Cold-worked material with ≥ 950 MPa tensile strength stores high elastic energy in a compact profile, maintaining bolt preload after relaxation, gasket creep, or vibration where flat washers would loosen.
   • Chamfer-free edges and a polished contact band (Ra ≤ 1.6 µm) minimise friction scatter, giving repeatable torque-to-tension results for Class A2-70 through 10.9 fasteners.
2. Wide Cross-Industry Application Spectrum
   • Automotive & Mobility: Controls clearance in brake caliper brackets, exhaust hangers, and drivetrain couplings exposed to heat cycles and road splash.
   • Industrial Machinery & Robotics: Compensates for bearing settle, thermal growth, and joint vibration in gearboxes, servo mounts, and packaging equipment frames.
   • Energy, HVAC & Utilities: Maintains clamp force on solar-panel clips, turbine shroud segments, and stainless pipe flanges subjected to day-night temperature swings.
   • Electronics, Medical & Food Equipment: Provides clean, non-flaking spring tension in circuit-board clamps, steriliser doors, and conveyor guides where carbon-steel parts are prohibited.
3. Installer-Friendly, Time-Saving Handling
   • Drop-in replacement for any standard metric M3–M20 flat washer—simply position the disc with concave face toward the joint and torque to the catalogue values; no special tools or shimming needed.
   • The shallow cone and low solid height fit tight stack-ups where coil springs or locknuts cannot, enabling lighter assemblies and reduced envelope size.
   • Laser-etched diameter codes on larger sizes ensure rapid visual verification during kitting; resealable packs keep parts clean and sorted on site or in automated feeders.
   • Smooth stainless surface offers a stable, lubricant-free coefficient of friction (μ ≈ 0.15 ± 0.03), simplifying torque charts and eliminating the mess of pre-applied greases.
4. Certified Quality & Long-Term Durability
   • 100 % dimensional inspection confirms outside diameter ±0.05 mm, thickness ±0.02 mm, cone angle ±0.5°, and parallelism ≤ 0.03 mm; Cp/Cpk ≥ 1.67 data archived under ISO 9001 and IATF 16949 systems.
   • Solution-anneal and ASTM A967 passivation remove surface iron, maximising chloride resistance; optional vibratory polishing achieves Ra ≤ 0.4 µm for hygienic or aesthetic assemblies.
   • Accelerated ageing—1 000 h salt-spray, 500 h cyclic humidity, and 2 × 10⁶ vibration pulses at 60 % deflection—shows ≥ 95 % preload retention with zero stress-corrosion cracking.
   • Each production lot carries a traceable code linking melt chemistry, hardness profile, load-deflection curve, and inspection records, giving engineers full confidence for safety-critical connections across industries.