Spi 12-720-9 Rectangle Steel Gage Block 4 in Grade 0

Product Description

The SPI 12-720-9 is a Grade 0 rectangular steel gage block measuring 4.00000 inches, designed for high-precision dimensional measurement and calibration work. Grade 0 is a master-grade accuracy classification, making this block suitable for laboratory environments and calibration labs where tight tolerance verification is required. Each block ships with NIST certification, confirming traceability to national measurement standards. Weighing approximately 0.3 pounds, it is sized for bench use. Machinists, metrologists, quality technicians, and toolroom professionals rely on gage blocks of this grade for setting comparators, verifying instruments, and establishing reference dimensions.

This gage block is used in precision metrology applications including dimensional inspection, instrument calibration, and reference standard work. It fits into standard gage block sets and accessories and is appropriate for use in controlled temperature environments typical of quality labs and toolrooms. The 4.00000-inch nominal size provides a precise reference length for setups requiring that dimension. Both production floor inspection and formal laboratory calibration are within its designed application scope.

Key Features

• Grade 0 master-grade accuracy for laboratory and calibration use
• Nominal size of 4.00000 inches for precise dimensional reference
• Steel construction for durability and dimensional stability
• Includes NIST certification 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 rectangular gage block sets, holders, and accessories in toolroom and laboratory metrology applications.

Installation Notes

Gage blocks are handled and wrung together by metrology technicians and quality personnel in controlled environments. Store blocks in their protective case and allow thermal stabilization before use, as temperature variation directly affects dimensional accuracy. Clean surfaces thoroughly before wringing to prevent scoring. Do not use gage blocks as general-purpose spacers or in applications involving impact or cutting forces.