Vlier SCH348 Steel Thumb Screw 1/2-13 Knurled Head

Product Description

The VLIER SCH348 is a steel thumb screw designed for manual clamping and adjustment applications where tool-free operation is required. It features a knurled head for positive hand grip and a swivel pad tip that pivots up to 7.5 degrees to conform to angled or irregular workpiece surfaces. The screw is finished in black oxide for moderate corrosion resistance and a uniform dark appearance. Machined to UNC thread standards at 1/2-13, it is dimensioned at 3.0625 inches overall length with a 1.25-inch head diameter and a 9/16-inch head height. Installation requires no tools for most clamping applications, making it suited to fixturing, tooling, and machine setup work.

This thumb screw is a standard inch-series fastener used in industrial fixturing, jigs, machine tool setups, and clamping assemblies. Its swivel pad tip distributes clamping load and reduces surface marring on workpieces. The 1/2-13 UNC thread is compatible with a wide range of standard tapped fixtures and clamping blocks found in manufacturing and production environments. Both the body and tip are steel construction, suited for general-purpose shop and industrial use.

Key Features

• Knurled head allows secure hand tightening without tools
• Swivel pad tip pivots up to 7.5 degrees to accommodate angled surfaces
• 1/2-13 UNC thread standard for broad fixture compatibility
• Black oxide finish provides moderate corrosion resistance
• Steel body and tip for durability in shop environments
• Manufactured under ISO 9001 quality management standards

Compatibility

Designed as a standard inch-series replacement or add-on thumb screw for industrial clamping assemblies, jigs, and fixtures using 1/2-13 UNC tapped holes.

Installation Notes

Installation is performed by hand threading into a 1/2-13 UNC tapped hole in a fixture or clamping block. Ensure the mating threaded hole is clean and free of debris before installation. Do not use a wrench or driver on the knurled head, as this may damage the knurling or over-torque the assembly. Swivel pad contact surface should be inspected periodically for wear in high-cycle clamping applications.