Spi 91-317-8 Adjustable Angle Block Tool Steel

Product Description

The SPI 91-317-8 is a precision adjustable angle block machined from tool steel and hardened to 50-55 Rc for long service life in demanding shop environments. The block adjusts from 0 to 90 degrees in the V-angle, with a usable adjustable range of 0 to 60 degrees and a minimum angular accuracy of 10 minutes of arc. Measuring 3.75 inches long, 1.75 inches wide, and 2 inches high, it provides a stable, rigid reference surface for layout, inspection, and grinding setups. Machinists, toolmakers, and quality technicians use this block for precise workholding and angular measurement tasks.

This angle block is suited for use in machine shops, tool rooms, and quality control departments. It is sized for bench-top layout work and fits standard surface plate setups. The adjustable design covers a wide range of angular settings, reducing the need for multiple fixed-angle blocks. It is appropriate for both one-off setups and repeated production inspection tasks where a reliable, hardened reference is required.

Key Features

• Adjustable angle range: 0 to 60 degrees
• V-angle: 90 degrees
• Minimum angular accuracy: 10 minutes of arc
• Tool steel construction hardened to 50-55 Rc for wear resistance
• Compact footprint: 3.75 x 1.75 x 2 inches for surface plate and bench use

Compatibility

Designed as a general-purpose adjustable angle block for use in standard machine shop and inspection setups requiring a hardened tool steel reference surface.

Installation Notes

This block is a bench and surface plate tool requiring no permanent installation. Clean the reference surfaces of both the block and the surface plate before use to ensure accurate contact. Handle with care to avoid nicking the hardened surfaces, as damage will affect angular accuracy. Service and calibration verification should be performed by a qualified toolmaker or metrologist.