The railway wedge—also called friction wedge or bogie wedge—is a one-piece casting that sits between the bolster and side frame of a freight-truck bogie. Its main jobs are:   

Increase yaw damping to suppress hunting and car-body sway.  

Lock bogie geometry, keeping wheel-sets parallel and gauge true.  

Self-feed as faces wear, maintaining preload without re-tightening.  - Compensate for temperature and humidity changes, ensuring a stable friction coefficient.   

Correct material and installation directly decide the life, performance and reliability of the entire rail system.   

Why ADI?  

Tensile ≥ 1 200 MPa – 1.8× forged steel, yet 10 % lighter.  

Elongation ≥ 4 % – absorbs impact without brittle fracture.  

Fatigue limit 400-500 MPa** – doubles life under 20 kN cyclic shear.  

Stable μ 0.28-0.34** from -50 °C to +70 °C, verified by CRRC tests.  

Near-net casting** – 18 % machining cost saved.   

FAQ:

Q1. How do I Confirm Compatibility?

Send us the OEM part number or a sample; we’ll issue a comparison report within 24 h.

Q2. What is the MOQ?

Standard models 10 pcs; custom models 30 pcs.If you have special requirements, please contact us.

Contact Us：

SMEMACH is a professional high-end custom metal parts manufacturer. We use advanced processes such as casting, forging, welding and CNC machining to provide customized products and comprehensive technical solutions according to your design specifications. 

Regarding ADI (Austempered Ductile Iron) technology, we have been researching for decades, combined with practical experience, and our products have been well received by customers. Our products are exported to Europe, America, Southeast Asia and other countries and regions. Contact us now to discuss your needs.

ADI 1200-4 Material Properties: