Thomson Industries Qsm 20 L 12 Round Linear Shaft

Product Description

The THOMSON INDUSTRIES QSM 20 L 12 is a standard round linear shaft designed for use in linear motion systems and mechanical assemblies. Machined from steel and through-hardened to a Rockwell hardness of 60 to 65C, this shaft provides the surface durability required for recirculating ball bushing and linear bearing applications. The shaft measures 20mm in diameter with a close diameter tolerance range of 0.7869 inches to 0.7874 inches, and an overall length of 12 inches. Licensed HVAC and mechanical trade installers as well as industrial maintenance technicians are the primary end users for this type of linear motion component.

This shaft is suited for residential and commercial linear motion assemblies including actuators, slides, and precision positioning equipment. The 20mm diameter and 12-inch length make it appropriate for compact drive systems and guided linear travel applications. It is a direct-fit standard shaft intended for use wherever a hardened steel linear shaft of this diameter and length is specified by the equipment manufacturer or system designer. No compatibility with specific model numbers or system families is stated in the available product data.

Key Features

• Through-hardened steel construction rated at 60 to 65C Rockwell hardness for wear resistance in bearing contact zones
• Tight diameter tolerance of 0.7869 inches to 0.7874 inches for precise linear bearing fitment
• 20mm nominal shaft diameter in a 12-inch overall length
• Standard shaft type compatible with common linear bushing and rail systems
• Steel material provides high load capacity and dimensional stability

Compatibility

Designed as an OEM-style replacement or direct-fit standard shaft for linear motion assemblies requiring a 20mm diameter hardened steel round shaft at 12 inches in length.

Installation Notes

Installation is typically performed by millwrights, mechanical technicians, or industrial maintenance personnel. Always de-energize and lock out the machine before removing or installing linear shafting. Confirm shaft alignment with the bearing or bushing housing before securing end supports to prevent side loading. Inspect mating linear bearings for wear before installing a new shaft.