Automotive Transmission Gear Shaft 20CrMnTi Alloy Steel Spline Ground Heat Treated ISO 9001

Transmission Gear Shaft – 20CrMnTi Alloy Steel

The automotive transmission gear shaft is a precision drivetrain component designed for heavy-duty commercial vehicle gearboxes. Constructed from 20CrMnTi alloy steel with advanced carburizing heat treatment, this shaft delivers the high torque capacity, wear resistance, and dimensional stability essential for millions of shift cycles in demanding road and off-road applications.

Key Features

• 20CrMnTi Alloy Steel Material: This chromium-manganese-titanium alloy provides excellent core toughness and surface hardenability, specifically optimized for automotive transmission gearing applications requiring impact resistance.
• Carburizing and Quenching Process: Controlled atmosphere carburizing achieves an effective case depth of 0.8-1.2mm with surface hardness of 58-62 HRC, providing outstanding pitting and scuffing resistance for gear tooth flanks and spline surfaces.
• Precision Spline Grinding: Involute splines are finished to DIN 5480 or ANSI B92.1 standards on CNC spline grinding machines, guaranteeing accurate fitment with mating clutch hubs and synchronizer sleeves.
• ISO 6-7 Gear Accuracy: All gear profiles are precision-ground ensuring smooth engagement, minimal transmission noise, and efficient power transfer across the entire operating speed range.
• Full Traceability: Each production batch is documented with heat treatment charts, material mill certificates, and dimensional inspection reports.

Technical Specifications

Applications

Designed for main shaft, countershaft, and output shaft positions in manual and automated manual transmissions (AMT) for heavy trucks, buses, and commercial vehicles. Compatible with Eaton Fuller, ZF, Allison, and Fast Gear transmission series. Ideal for both OEM production and aftermarket replacement supply chains.

Quality Assurance

Every transmission gear shaft undergoes 100% inspection including gear profile measurement on Klingelnberg P-series analyzers, spline go/no-go gauge verification, magnetic particle crack detection, and Rockwell hardness testing. We provide full quality documentation with every shipment.