Spi 61R-8 Inches-.0005 Precision Inspection Block Level

Product Description

The SPI 61R-8"-.0005 is a cast iron precision inspection block level built for surface plate and machine tool calibration work. It measures 8 inches in length with a base width of 1-9/16 inches and delivers a graduation sensitivity of 0.0005 inches per 10 inches, making it suitable for high-accuracy leveling and alignment tasks. Two vials are included for simultaneous cross-axis readings. At 3.6 pounds, the cast iron body provides the mass and rigidity needed to resist flex and vibration during inspection. This type of instrument is used by machinists, metrology technicians, and quality control personnel in precision manufacturing and machine tool service environments.

This inspection block level is suited for surface plate work, machine tool leveling, and precision alignment in toolroom and production metrology applications. Its 0.0005-inch-per-10-inch sensitivity makes it appropriate for tasks that demand tight tolerances and where standard bubble levels are insufficient. The dual-vial configuration supports leveling in two planes without repositioning the block, reducing setup time on horizontal surface checks.

Key Features

• 0.0005 inch graduation sensitivity per 10 inches for high-accuracy leveling
• Cast iron construction for rigidity and thermal stability
• 8 inch working length with 1-9/16 inch base width
• Two vials allow simultaneous dual-axis readings
• Base flatness of 0.0002 inch for reliable contact on precision surfaces
• 3.6 pound mass resists movement and vibration during use

Compatibility

Designed for use on precision surface plates, machine tool beds, and similar flat reference surfaces in toolroom and inspection environments.

Installation Notes

Precision block levels are used by metrology technicians and machinist tradespeople and require no permanent installation. Before use, ensure the reference surface is clean and free of burrs, chips, or debris that could tilt the instrument and produce false readings. Allow the level to thermally stabilize on the surface before recording readings, as temperature gradients in cast iron can affect vial accuracy. Handle with care to protect the lapped base from nicks or scratches that would compromise flatness.