Thomson Industries Qs 3/4 L 18 Round Linear Shaft

Product Description

The THOMSON INDUSTRIES QS 3/4 L 18 is a round linear shafting component machined from 1566 material-grade steel with a hardness rating of 60 to 65 Rockwell C. The shaft measures 0.75 inches in diameter and 18 inches in overall length, with a tightly controlled diameter tolerance of 0.7490 to 0.7495 inches. This level of precision makes it suitable for linear motion systems where shaft-to-bearing fit directly affects performance and service life. Licensed mechanical technicians, millwrights, and motion-system integrators typically specify and install this type of component in industrial and automation applications.

This shaft is used in linear motion assemblies including slide systems, actuator builds, and precision positioning equipment. It is appropriate for both light industrial and higher-cycle automation environments where consistent shaft geometry is required. The 18-inch length suits mid-range travel applications and can be paired with compatible linear bearings and support rails in standard linear motion system builds.

Key Features

• 0.75-inch nominal diameter with tight tolerance range of 0.7490 to 0.7495 inches for precise bearing fit
• 1566 material-grade steel construction for durability in load-bearing linear motion use
• Hardness of 60 to 65 Rockwell C for wear resistance under repeated cycling
• 18-inch overall length suits mid-range linear travel requirements
• Standard shaft type for compatibility with common linear bearing configurations

Compatibility

Designed as an OEM-style replacement or standard component for linear motion systems using 0.75-inch bore linear bearings and shaft supports. No specific model compatibility was provided in the product data.

Installation Notes

Installation should be performed by a qualified millwright or mechanical technician familiar with linear motion system assembly. De-energize and lock out all power to the machine before removing or installing shafting. Shaft surfaces should be kept free of burrs and contamination prior to bearing installation to protect tolerance integrity. Follow the equipment manufacturer's guidelines for shaft support spacing and bearing preload.