Spi 91-300-4 V-block Set 120 Degree 5 Inch Capacity

Product Description

The SPI 91-300-4 is a matched pair of steel V-blocks designed for precision workholding and inspection tasks in machine shops and toolrooms. Each block features a 120-degree V-angle and accepts round stock or cylindrical workpieces from 3/16 inch minimum up to 5 inches maximum diameter. The set measures 4 inches in overall length, 1-3/4 inches overall width, and 3-9/16 inches overall height. Clamps are included to secure the workpiece during layout, grinding, drilling, or measurement operations. Machinists, toolmakers, and metrology technicians are the primary users of this equipment.

This V-block set is suited for use on surface plates, milling machine tables, or precision granite inspection tables. The 120-degree angle provides stable three-point contact across a wide range of cylinder diameters, making it appropriate for shaft inspection, centerline layout, and rotational alignment tasks in both production and quality-control environments. The non-magnetic steel construction keeps the blocks neutral in environments where magnetic workholding would interfere with sensitive instruments or workpieces.

Key Features

• Sold as a matched 2-block set for balanced workholding support
• 120-degree V-angle provides stable seating across a broad diameter range
• Accepts cylindrical stock from 3/16 inch to 5 inches in diameter
• Non-magnetic steel construction for use near sensitive instruments
• Clamps included to secure workpieces without additional hardware
• 4-inch block length supports longer shafts and precision layout work

Compatibility

Designed as a general-purpose V-block set for use on standard surface plates and machine tables in machining, inspection, and toolroom applications.

Installation Notes

V-blocks should be placed on a clean, flat reference surface before seating the workpiece. Ensure the V-groove and contact surfaces are free of burrs, chips, and debris before clamping. Tighten the included clamps evenly to avoid lateral displacement of the workpiece. Handle steel blocks carefully on precision surface plates to prevent surface damage.