Thomson Industries Qs 3/4 L 72 Round Linear Shafting

Product Description

The THOMSON INDUSTRIES QS 3/4 L 72 is a round linear shafting rod used in linear motion systems, machine assemblies, and precision mechanical applications. Machined from 1566 grade steel and case-hardened to 60 to 65 Rockwell C, this shaft delivers the surface hardness required for use with linear bearings and bushings. The nominal diameter is 0.75 inches, held to a tight tolerance range of 0.7490 to 0.7495 inches across the full 72-inch length. Installation is typically handled by mechanical assemblers, machine builders, or maintenance technicians working on motion control or industrial equipment.

This shafting is suited for residential and commercial machine assemblies where a standard 3/4-inch round shaft is required. Common applications include linear actuator systems, gantry assemblies, automated equipment frames, and support shaft configurations. The 72-inch length provides flexibility for custom cut-to-length installations or direct drop-in use in longer travel systems. Its hardened steel construction makes it appropriate for environments where the shaft interfaces with recirculating ball or plain bearing elements.

Key Features

• 1566 grade steel construction for consistent mechanical properties
• Case hardness of 60 to 65 Rockwell C for wear resistance at bearing contact zones
• Tight diameter tolerance of 0.7490 to 0.7495 inches for reliable bearing fit
• 72-inch overall length supports long-travel or cut-to-length installations
• Standard 3/4-inch nominal diameter for broad compatibility with linear bearing components

Compatibility

Designed as an OEM-style replacement or new-build component for linear motion systems that accept standard 3/4-inch round hardened steel shafting.

Installation Notes

Installation is performed by mechanical technicians or machine builders using standard shaft support blocks, end supports, and linear bearing assemblies. Ensure the mounting structure is de-energized and any loaded components are secured before removing or installing shafting. Use appropriate cutting tools rated for hardened steel if field-cutting to length, and deburr cut ends before fitting bearings. Verify shaft support spacing per the application load requirements to prevent deflection.