Thomson Industries Qs 3/8 L 12 Round Linear Shaft Steel

Product Description

The THOMSON INDUSTRIES QS 3/8 L 12 is a round linear shaft used in precision motion control and linear guide applications. Manufactured from 1566 grade steel with a hardness of 60 to 65 HRC, this shaft delivers the surface durability and dimensional consistency required for linear bearing systems. The shaft measures 0.375 inches in nominal diameter with a tight tolerance range of 0.3740 to 0.3745 inches, and runs 12 inches in overall length. It is suited for OEM equipment builders, mechanical maintenance technicians, and linear motion system integrators working with Thomson-compatible shaft-and-bearing assemblies.

This shaft is used in linear motion systems found in industrial automation, packaging machinery, medical equipment, and general mechanical assemblies requiring guided sliding motion. Its standard shaft type designation makes it a direct fit for applications calling for 3/8-inch round linear shafting with close diameter tolerances. Technicians replacing worn or damaged shafts in existing linear guide systems will find the tight diameter tolerance critical for maintaining proper bearing preload and smooth travel.

Key Features

• 1566 grade steel construction for strength and wear resistance in linear bearing contact zones
• Hardness of 60 to 65 HRC provides surface resistance against bearing rolling element wear
• Tight diameter tolerance of 0.3740 to 0.3745 inches ensures consistent bearing fit
• 12-inch overall length suitable for short-stroke linear guide assemblies
• Standard shaft type compatible with conventional round-bore linear bushings

Compatibility

Designed as an OEM-style replacement for round linear shafting applications requiring a 3/8-inch nominal diameter, 12-inch length, and 60 to 65 HRC hardened steel construction.

Installation Notes

Installation is typically performed by mechanical or industrial maintenance technicians. De-energize and lock out all power and motion sources before removing or inserting shafting in any linear guide assembly. Use a shaft alignment fixture and proper bearing press tools to avoid surface damage that could compromise the tight diameter tolerance. Inspect mating linear bearings for wear before installing new shafting to ensure proper fit.