Mitutoyo 611212-531 Steel Gage Block 0.25 in Grade 0

Product Description

The MITUTOYO 611212-531 is a rectangular steel gage block with a nominal length of 0.25 inches and an accuracy rating of Grade 0. Gage blocks are precision-ground reference standards used to calibrate measuring instruments, verify dimensional accuracy, and set up inspection equipment. Grade 0 designates a high level of dimensional accuracy suitable for calibration and metrology lab applications. This block conforms to ASME standards and ships with a Certificate of Inspection documenting its measured value. It is handled by metrology technicians, quality control professionals, and precision machinists working in manufacturing and inspection environments.

This gage block is suited for use in metrology labs, machine shops, and quality inspection departments where verified dimensional references are required. Typical applications include setting height gauges, calibrating micrometers and calipers, and performing go/no-go dimensional checks. The 0.25-inch size is a common increment in inch-series gage block sets and sees regular use as a standalone reference block in toolroom and production inspection work.

Key Features

• Grade 0 accuracy per ASME standards for high-precision calibration and inspection use
• Steel construction for durability and long-term dimensional stability
• Nominal length of 0.25 inches, a standard increment in inch-series sets
• Includes Certificate of Inspection with documented measured value
• Rectangular form compatible with standard gage block accessories and holders

Compatibility

Designed as an OEM-style precision reference standard for use with standard inch-series gage block accessories, holders, and wringing fixtures in calibration and dimensional inspection applications.

Installation Notes

Gage blocks are handled by metrology technicians and quality control personnel, not field tradespeople. Always clean block surfaces with a lint-free cloth and approved cleaning solvent before use to prevent contamination or corrosion. Store the block in its case away from temperature extremes, as thermal expansion affects dimensional accuracy. Do not drop or stack blocks improperly, as surface damage will compromise measurement integrity.