Starrett 51312 V-block Set 1 in 90 Degree Hardened Steel

Product Description

The STARRETT 51312 is a hardened steel V-block set designed for precision workholding and inspection tasks in machine shops, toolrooms, and maintenance environments. The set includes two V-blocks and two clamps, providing a matched pair for supporting cylindrical workpieces during layout, drilling, grinding, or measurement operations. Each block features a 90-degree V-angle and accepts round stock from 17/32 inch minimum up to 1 inch maximum diameter. Accuracy is held to 1/64 inch, making this set suitable for consistent, repeatable setups where part alignment is critical.

This V-block set is used in metalworking and machining applications where cylindrical parts must be held securely and accurately. Typical applications include shaft inspection, cylindrical grinding setups, layout work on surface plates, and drill press operations requiring centered workholding. The included clamps secure the workpiece firmly in the V-groove, reducing movement during machining or measurement. The compact block dimensions make this set practical for benchtop use in both production and toolroom settings.

Key Features

• Hardened steel construction for wear resistance and long service life
• 90-degree V-angle accepts round stock from 17/32 inch to 1 inch diameter
• Accuracy to 1/64 inch for repeatable, precise workholding
• Sold as a 2-block set with two clamps included
• Compact size: 1.625 inches long, 1.25 inches wide, 1.25 inches tall per block
• Non-magnetic hardened steel — suitable for use near sensitive measuring instruments

Compatibility

Designed as a standard 90-degree V-block set for general metalworking, inspection, and toolroom workholding applications involving cylindrical stock up to 1 inch in diameter.

Installation Notes

V-blocks are set up by qualified machinists or toolroom technicians on a surface plate or machine table. Ensure the work surface is clean and free of chips or burrs before placing the blocks to maintain accuracy. Secure the workpiece with the included clamps before beginning any machining or layout operation. Always inspect blocks for nicks or damage on the V-groove surfaces before use, as surface defects will affect workholding accuracy.