Spi 91-294-9 V-block 4-way 2 Inch Max Capacity Matched Pair

Product Description

The SPI 91-294-9 is a 4-way cast iron V-block designed for precision workholding and inspection applications in machine shops and toolrooms. It features a 90-degree V angle and accepts round workpieces from 0.75 inches minimum to 2 inches maximum capacity. The block measures 4 inches in overall length, 4 inches in overall height, and 1.1875 inches in overall width. V parallelism is held to 0.0012 inches (30 micrometers), and squareness is 0.0012 inches per inch, making this block suitable for layout, grinding, milling, and cylindrical inspection work. Sold as a matched pair. Machinists, toolmakers, and quality technicians are the primary users.

The SPI 91-294-9 is used in precision metalworking environments where accurate positioning and inspection of cylindrical or round parts is required. Typical applications include layout work, surface grinding setups, roundness checks, and shaft or pin alignment tasks. The 4-way design allows workpieces to be clamped and repositioned without losing registration. The matched pair configuration ensures consistent results when both blocks are used together on a surface plate or magnetic chuck.

Key Features

• 4-way V-block design supports multiple workpiece orientations
• 90-degree V angle accommodates a wide range of round stock diameters
• Minimum capacity 0.75 inches, maximum capacity 2 inches
• V parallelism held to 0.0012 inches (30 micrometers)
• Squareness 0.0012 inches per 1 inch of height
• Cast iron construction for rigidity and vibration damping
• Sold as a matched pair for surface plate and grinding chuck use

Compatibility

Designed as a standard precision V-block for use on surface plates, magnetic chucks, and milling machine tables where workpieces with round cross-sections between 0.75 inches and 2 inches in diameter require accurate support and positioning.

Installation Notes

V-blocks are typically set up by machinists or toolroom personnel on a clean, flat surface plate or machine table. Ensure the mating surface is free of burrs, chips, and oil film before placing the block to maintain accuracy. When used on a magnetic chuck, verify the block is fully seated and stable before engaging the workpiece. Do not exceed the 2-inch maximum capacity, as overloading the V groove can damage the precision surfaces.