Starrett 90152 Square Steel Gage Block 20 in Grade 0

Product Description

The STARRETT 90152 is a square steel gage block sized at 20 inches, manufactured to Grade 0 accuracy standards. Gage blocks serve as precision reference standards used to calibrate measuring instruments, verify dimensional tolerances, and establish accurate length references in metrology and quality control environments. Built from steel and held to Grade 0 tolerances, the 90152 delivers the dimensional stability and surface flatness required for high-accuracy inspection work. This block is handled by calibration technicians, quality engineers, and precision machinists in industrial and manufacturing settings.

This gage block is suited for use in machine shops, metrology labs, and quality assurance departments where large-dimension reference standards are required. At 20 inches, it addresses applications involving large workpieces or fixtures that require a substantial reference length. Grade 0 accuracy makes it appropriate for inspection and calibration tasks where tighter tolerances are demanded compared to standard working-grade blocks.

Key Features

• Grade 0 accuracy for high-precision dimensional reference and calibration work
• 20-inch nominal size suitable for large-dimension measurement applications
• Steel construction provides dimensional stability and durability under shop conditions
• Square form factor allows stable placement and wringing to other gage block sets

Compatibility

Designed as an OEM-style precision reference standard compatible with gage block sets, surface plates, and calibration fixtures used in industrial metrology applications.

Installation Notes

Gage blocks are handled by calibration technicians and metrologists following established metrology lab procedures. Blocks should be stored in their protective case and cleaned of oils and debris before use to prevent wringing failure or measurement error. Handle with care to avoid nicks or burrs on the reference surfaces, as surface damage will compromise accuracy. Calibration intervals should comply with applicable quality system requirements such as ISO 10012 or ANSI Z540.