Mitutoyo 611179-531 Steel Gage Block 0.139 in Grade 0

Product Description

The MITUTOYO 611179-531 is a rectangular steel gage block measuring 0.139 inches, manufactured to Grade 0 accuracy. Gage blocks are precision-ground reference standards used to calibrate measuring instruments, set comparators, and verify dimensional accuracy in machining and inspection environments. This block meets ASME standards and ships with a Certificate of Inspection, making it suitable for quality-controlled metrology workflows. Grade 0 represents a high level of dimensional accuracy, appropriate for tool room and inspection lab applications. Installation and handling require care to maintain surface integrity and dimensional stability over time.

This gage block is used in tool rooms, quality inspection labs, and production environments where precise length references are required. It serves as a calibration reference for micrometers, calipers, height gages, and comparators. Typical users include machinists, metrologists, and quality control technicians working in manufacturing, aerospace, automotive, and general precision industries. The rectangular form factor allows for wringing to other gage blocks to build up composite lengths.

Key Features

• Grade 0 accuracy per ASME standards for high-precision dimensional reference
• 0.139-inch nominal size with five-decimal precision
• Steel construction for durability and dimensional stability
• Includes Certificate of Inspection for traceability requirements
• Rectangular form supports wringing with other gage blocks

Compatibility

Designed as an OEM-style precision reference standard compatible with standard rectangular gage block sets and accessories used in general metrology and inspection applications.

Installation Notes

Gage blocks should be handled by a qualified metrologist or quality technician using clean, lint-free gloves to prevent corrosion from skin contact. Store blocks flat in a protective case away from temperature extremes to prevent thermal expansion errors. Before use, allow the block to stabilize to room temperature. Clean mating surfaces thoroughly before wringing to avoid surface damage or measurement error.