Spi 15-091-2 Rectangle Steel Gage Block 6 in Grade AS-1

Product Description

The SPI 15-091-2 is a rectangular steel gage block measuring exactly 6.00000 inches, ground and lapped to Grade AS-1 accuracy. Gage blocks at this grade meet tight tolerance requirements for dimensional reference and calibration work. Each block ships with NIST certification, confirming traceability to national measurement standards. This type of precision reference block is used by machinists, metrologists, and quality control technicians to verify measuring instruments, set comparators, and establish dimensional datums on the shop floor or in a calibration lab.

The 15-091-2 is suited for precision measurement applications in manufacturing, metrology labs, tool and die shops, and inspection departments. The 6-inch nominal size makes it a practical reference block for setting up height gages, surface plates, and precision transfer applications. Its NIST-traceable certification supports quality management systems that require documented measurement traceability, including ISO 9001 and AS9100 compliant environments.

Key Features

• Grade AS-1 accuracy for high-precision dimensional reference
• 6.00000 inch nominal size with certified dimensional value
• Steel construction for durability and long gauge life
• NIST certification included, confirming measurement traceability
• Rectangular form compatible with standard gage block accessories and holders

Compatibility

Designed as an OEM-style precision reference standard for use with standard gage block sets, holders, and accessories compatible with rectangular-form steel gage blocks.

Installation Notes

Gage blocks should be handled by qualified metrology or machining personnel using clean, lint-free gloves or finger cots to prevent corrosion from skin contact. Store blocks in a protective case away from moisture and temperature extremes. Before use, allow the block to stabilize to ambient temperature, typically 68 degrees F per ASME B89.1.9 standards, to ensure dimensional accuracy. Clean contact surfaces with approved gage cleaning solution before wringing or referencing against other precision surfaces.