Mitutoyo 611203-541 Steel Gage Block 3 in Grade AS-1

Product Description

The MITUTOYO 611203-541 is a rectangular steel gage block ground and lapped to Grade AS-1 accuracy per ASME standards. Gage blocks are end-measurement standards used to calibrate, set, and verify measuring instruments and fixtures in precision machining, quality control, and metrology applications. This block measures exactly 3.00000 inches and ships with a Certificate of Inspection confirming it meets the stated accuracy grade. Steel construction provides the durability and stability required for repeated use in shop-floor and lab environments. Licensed metrologists, machinists, and QC technicians rely on gage blocks like this one to establish traceable dimensional references.

This block is suited for use in machine shops, toolrooms, calibration labs, and quality assurance departments. Grade AS-1 indicates a high-accuracy classification under ASME B89.1.9, making it appropriate for inspection and calibration work where tighter tolerances are required. The 3-inch nominal size is a common reference length used when setting comparators, height gages, snap gages, and similar instruments. It can be used individually or wrung together with other blocks in a gage block set for composite dimensions.

Key Features

• Grade AS-1 accuracy per ASME B89.1.9 for high-precision measurement tasks
• 3.00000-inch nominal size for traceable dimensional reference
• Steel construction for long-term dimensional stability and wear resistance
• Includes Certificate of Inspection for traceability documentation
• Rectangular form supports wringing with compatible gage blocks for composite lengths

Compatibility

Designed as an OEM-style individual gage block compatible with standard rectangular gage block sets and accessories that conform to ASME B89.1.9 specifications.

Installation Notes

Gage blocks are handled and stored by metrology technicians and precision machinists following established calibration procedures. Before use, clean all mating surfaces thoroughly to remove oils, debris, and burrs that can affect accuracy or damage lapped surfaces. Store blocks in a protective case away from temperature extremes to minimize thermal expansion effects. Do not drop, stack carelessly, or slide blocks across abrasive surfaces, as surface damage will compromise accuracy.