Spi 12-689-6 Steel Gage Block 0.139 in Grade 0 Nist

Product Description

The SPI 12-689-6 is a Grade 0 rectangular steel gage block measuring 0.139 inches, supplied with NIST certification. Gage blocks serve as precision length references used to calibrate measuring instruments, set comparators, and verify dimensional accuracy on the shop floor or in a metrology lab. Grade 0 denotes a high level of dimensional accuracy suitable for tool room and inspection applications. The steel construction provides durability and wear resistance through repeated wringing and handling. This block ships individually and is intended for use by machinists, quality technicians, and metrologists who require traceable, certified dimensional standards.

This gage block is used in machine shops, tool rooms, and quality control environments where precise length reference is required. Typical applications include setting up surface plates, calibrating micrometers and calipers, and establishing reference datums for inspection fixtures. The included NIST certification provides traceability documentation required in ISO and quality-management-system environments. It is suited for both standalone use and integration into a larger gage block set.

Key Features

• Grade 0 accuracy for tool room and inspection-grade dimensional reference
• Steel construction for durability and long service life through repeated wringing cycles
• Nominal size of 0.139 inches for precise length referencing
• Includes NIST certification for traceable calibration documentation
• Rectangular form compatible with standard gage block holders and accessories

Compatibility

Designed as a precision length reference standard compatible with standard rectangular gage block holders, comparator stands, and accessories used in tool room and metrology applications.

Installation Notes

Gage blocks are handled and used by machinists and quality technicians following standard metrology practices. Clean and deburr mating surfaces before wringing blocks together to avoid damage to lapped faces. Store blocks in a protective case away from moisture and temperature extremes to maintain dimensional stability and prevent corrosion. Never drop or strike gage blocks against hard surfaces, as impact damage will compromise accuracy.