Vlier SCH342 Knurled Thumb Screw 3/8-16 Unc 3 in Steel

Product Description

The VLIER SCH342 is a knurled head thumb screw designed for tool-free manual adjustment and clamping in industrial, mechanical, and assembly applications. Machined from steel with a black oxide finish, this thumb screw features a swivel pad tip that self-aligns to workpiece surfaces, reducing point stress during clamping. The 3/8-16 UNC thread is a standard coarse-thread size commonly found in fixtures, jigs, and machine tooling. At 3 inches overall length with a 1.25-inch diameter knurled head, this fastener provides solid grip and torque for hand-tightened applications. Manufactured to ISO 9001 standards.

This thumb screw is suited for use in machine tool fixtures, workholding setups, inspection fixtures, and general industrial assembly where frequent manual adjustment is required. The swivel pad tip accommodates slight angular variation between the screw and the clamping surface, making it appropriate for use against angled or uneven workpieces. The without-shoulder configuration allows straightforward installation into standard threaded holes without requiring a counterbore or shoulder seat.

Key Features

• 3/8-16 UNC coarse thread for broad fixture and tooling compatibility
• Knurled head at 1.25 inches diameter provides secure manual grip without tools
• Swivel pad tip with 7.5-degree swivel angle self-aligns to workpiece surfaces
• Steel construction with black oxide finish for corrosion resistance in shop environments
• Without-shoulder design fits standard threaded holes directly
• Manufactured under ISO 9001 quality management standards

Compatibility

Designed as a standard 3/8-16 UNC thumb screw for use in industrial fixtures, jigs, workholding equipment, and machine tooling that accept a 3/8-16 threaded fastener.

Installation Notes

Installation is typically performed by machinists or assembly technicians using hand pressure only; avoid using wrenches or power tools on the knurled head, as this can damage the head or over-stress the thread. Ensure the mating threaded hole is clean and free of debris before installation. Verify thread engagement depth is sufficient for the application load before service.