Mitutoyo 611218-541 Steel Gage Block 0.85 in AS-1

Product Description

The MITUTOYO 611218-541 is a rectangular steel gage block measuring 0.85 inches in overall length, manufactured to AS-1 accuracy grade as defined by ASME standards. Gage blocks are precision-ground reference standards used to verify, calibrate, or set measuring instruments to a known dimension. Each block provides a stable, repeatable reference surface for dimensional inspection work. A Certificate of Inspection is included, confirming that the block meets the stated accuracy grade at the time of manufacture. This block is handled and used by metrology technicians, quality control inspectors, and precision machinists in industrial and manufacturing environments.

This gage block is suited for use in toolrooms, inspection labs, and on the shop floor wherever a traceable dimensional reference is required. It serves as a reference standard for setting comparators, calibrating micrometers and calipers, and establishing height references for surface plate work. The AS-1 grade designation indicates a high level of dimensional accuracy appropriate for general inspection and calibration applications in both production and quality assurance settings.

Key Features

• 0.85-inch nominal length ground to AS-1 accuracy grade per ASME standards
• Rectangular steel construction provides durable, wear-resistant reference surfaces
• Includes Certificate of Inspection for traceability documentation
• Suitable for setting comparators, calibrating instruments, and surface plate work
• Single-block package with a minimum order quantity of one

Compatibility

Designed as an OEM-style precision reference standard compatible with standard gage block accessories including holders, wringing films, and cases sized for rectangular inch-series gage blocks.

Installation Notes

Gage blocks are handled and stored by metrology and quality control personnel following established dimensional metrology practices. Before use, allow the block to thermally stabilize to the measurement environment, typically 68 degrees F per ASME B89 guidelines, to avoid thermal expansion errors. Clean mating surfaces before wringing blocks together, and store the block in its protective case when not in use to prevent corrosion and surface damage. Do not drop or stack blocks without proper holders, as damage to the lapped surfaces will compromise accuracy.