Mitutoyo 614225-531 Square Steel Gage Block 20 in Grade 0

Product Description

The MITUTOYO 614225-531 is a square steel gage block measuring 20.00000 inches, manufactured to Grade 0 accuracy. Gage blocks are precision ground and lapped reference standards used to calibrate measuring instruments, set up fixtures, and verify dimensional tolerances in machining and inspection environments. This block ships with a Certificate of Inspection, confirming it meets the stated accuracy grade at the time of manufacture. Weighing approximately 1 pound, it is sized for applications that require a full 20-inch reference standard. Metrology technicians, tool room machinists, and quality control personnel are the primary users of blocks at this grade and size.

Grade 0 gage blocks are used where tighter calibration tolerances are required compared to inspection-grade blocks. A 20-inch block is a less common nominal size suited for large-scale fixture setup, long-range calibration of measurement equipment, or specialized toolroom applications. Installation and use occur in controlled environments such as temperature-stabilized metrology labs or inspection rooms where thermal expansion effects on steel are managed. The included Certificate of Inspection documents traceability for quality management systems that require documented standards compliance per ASME specifications.

Key Features

• Grade 0 accuracy per ASME standards for tight calibration and inspection requirements
• 20.00000-inch nominal size for large-scale dimensional reference applications
• Steel construction for durability and long-term dimensional stability
• Includes Certificate of Inspection for documented traceability
• Square block geometry for consistent wringing and fixture setup

Compatibility

Designed as an OEM-style precision reference standard compatible with dimensional calibration setups, fixture alignment systems, and measuring instrument verification processes that require a 20-inch Grade 0 steel gage block meeting ASME standards.

Installation Notes

Gage blocks should be handled by metrology technicians or qualified tool room personnel familiar with proper wringing technique and storage procedures. Store blocks in a temperature-controlled environment and allow thermal stabilization before use to minimize steel expansion error. Clean contact surfaces with an appropriate gage block cleaning solution before and after use. Never use gage blocks on surfaces that may introduce scratches, burrs, or corrosion to the lapped faces.