Precision Pinion Shafts – Inch & Metric | One-Piece Integrated Gear & Shaft
GUNRI manufactures precision pinion shafts with integrated gear and shaft machined from a single blank. One-piece design delivers higher torque capacity and superior concentricity. Materials: stainless steel, alloy steel. Custom diameters, pitches, and tooth counts.
Description
What Are Pinion Shafts?
A pinion shaft is a shaft onto which a pinion gear has been directly machined as a single integrated component. This one-piece design eliminates the need for keyways, set screws, or other fastening methods, providing superior torque transmission, concentricity, and reliability compared to separate gear-plus-shaft assemblies.
Advantages of One-Piece Pinion Shafts
• Higher Torque Capacity — No keyway stress risers or slippage concerns
• Superior Concentricity — Gear and shaft are machined in one setup for perfect alignment
• Compact Design — Eliminates the space needed for hubs or fasteners
• Greater Reliability — No loose gears or fastener failures in high-vibration applications
• Customizable — Any combination of gear teeth, shaft diameter, length, and shoulder geometry
Specifications
Inch Sizes: DP 16 to 120, shaft diameters from 0.125 in to 2.0 in
Metric Sizes: Module 0.3 to 6, shaft diameters from 1 mm to 50 mm
Materials: Stainless steel (SUS303, SUS304, 416SS), alloy steel (SCM415, SCM440, 4140), carbon steel (S45C)
Hardness: Case-hardened HRC 55-62, through-hardened HRC 30-45, or as specified
Finish: 10 microinch Ra (ground), black oxide, electroless nickel
Features: Keyways, flat surfaces, cross-holes, threaded ends, shoulder stops
Applications
Automotive Steering & Transmission • Robotics Joints • Printers & Copiers • Medical Devices • Power Tools • Aerospace Actuators • Industrial Gearboxes • Packaging Machinery • Office Automation
Why Choose GUNRI for Pinion Shafts?
• Precision CNC gear hobbing and cylindrical grinding in a single flow
• One-piece construction from bar stock or forgings
• Complete secondary operations: drilling, milling, threading, heat treatment
• Engineering support for custom tooth profiles and shaft geometries
• Competitive pricing for OEM production volumes