Low Friction High Retention Banded Piston for Stable Shock Absorber Performance

Engineered for precision shock absorber applications, this D36 banded piston delivers exceptional low-friction operation and high retention force to ensure consistent damping performance across the full service life. Manufactured by XIAYI with advanced powder metallurgy and PTFE banding technology, it meets IATF16949:2016 quality standards for automotive-grade components.

This banded piston utilizes a high-density Fe-C-Cu sintered steel body combined with a filled PTFE banding ring. The unique material pairing achieves the ideal balance between structural rigidity and surface lubricity, allowing the piston to withstand millions of compression-rebound cycles without performance degradation.

XIAYI produces a complete range of suspension pistons, shock absorber pistons, rod guides, valve seats, and other powder metallurgy components for shock absorber systems. Our in-house tooling design, automated banding machines, and non-standard testing equipment ensure full process control from raw powder to finished assembly.

• Advanced Sintered Body: Fe-C-Cu powder metallurgy construction achieves over 6.5 g/cm3 density, providing the mechanical strength needed for high-stress damper environments.
• Filled PTFE Banding: PTFE ring compounded with carbon or customer-specified fillers dramatically reduces sliding friction while maintaining dimensional stability under thermal cycling.
• Precision Groove Geometry: Minimum 0.34 mm groove fill depth ensures the PTFE band remains securely seated, eliminating the risk of band dislodgement during operation.
• Fatigue-Tested Design: Every piston design undergoes drawing force testing to verify no band slippage occurs after repeated load cycles.
• Close Tolerances: Outer diameter controlled within a 0.25 mm window (36.05-36.30 mm) for consistent fit inside shock absorber tubes.

The banded piston undergoes a rigorous 10-step production sequence to achieve the precision and reliability required for automotive shock absorber applications:

1. Powder Blending 2. PTFE Cylinder Compression 3. Sintering 4. PTFE Disc Production 5. Pre-pressing 6. Heat Pressing 7. Molding 8. Deburring 9. Inspection 10. Packaging

Each step is monitored and controlled in-house. XIAYI designs and builds its own automatic banding machines and non-standard testing equipment, enabling full process optimization without depending on third-party equipment suppliers.

• Passenger car front and rear shock absorbers
• Motorcycle suspension dampers
• Light commercial vehicle shock absorber systems
• Performance and aftermarket suspension upgrades

• Vertical Integration: In-house tooling design, powder metallurgy production, PTFE banding, and testing equipment manufacturing — no outsourcing of critical processes.
• Automotive-Grade Quality: IATF16949:2016 certified, ensuring the rigorous quality systems demanded by global automotive OEMs and Tier-1 suppliers.
• Proven Experience: Years of specialization in shock absorber sintered components with exports to Japan and other demanding markets.
• Competitive Economics: Aggressive pricing enabled by automated production lines with annual capacity exceeding 20,000,000 pieces.
• Engineering Support: Our technical team can review your drawings, suggest design optimizations, and provide feasibility analysis before tooling begins.

Contact us today to discuss your banded piston requirements. Send your technical drawings or specifications for a prompt quotation and free technical consultation.