Spi 15-089-6 Steel Gage Block 4 Inches Grade AS-1

Product Description

The SPI 15-089-6 is a rectangular steel gage block measuring exactly 4.00000 inches, manufactured to Grade AS-1 accuracy. Gage blocks are precision reference standards used to calibrate measuring instruments, set comparators, and verify dimensional tolerances in machining, metrology, and quality control environments. This block includes NIST certification, providing traceable documentation of its dimensional accuracy. Grade AS-1 reflects a high level of dimensional precision suitable for calibration and inspection work. Machinists, metrologists, and quality technicians working in tool rooms, inspection labs, and production environments are the primary users of this type of reference standard.

This gage block is suited for use in dimensional inspection, instrument calibration, and precision layout work. It is appropriate for tool rooms, metrology labs, and manufacturing quality control departments where traceable measurement standards are required. The 4.00000-inch size fills a common need in setups requiring a precise 4-inch reference dimension. Single-block packaging makes it practical for adding to an existing gage block set or for use as a standalone reference standard.

Key Features

• Rectangular steel construction for durability and long-term dimensional stability
• Grade AS-1 accuracy for high-precision calibration and inspection applications
• Nominal size of 4.00000 inches for reliable reference measurement
• Includes NIST certification with traceable documentation
• Single-block packaging for individual replacement or set supplementation

Compatibility

Designed as a standalone or supplemental rectangular steel gage block compatible with standard gage block sets and accessories used in dimensional metrology and inspection applications.

Installation Notes

Gage blocks are handled and used by metrologists, quality technicians, and skilled machinists. Store blocks in a clean, dry environment and allow thermal stabilization before use to ensure dimensional accuracy. Clean mating surfaces before wringing blocks together, and avoid dropping or sliding blocks across hard surfaces to prevent damage to precision faces. Periodic recertification against NIST-traceable standards is recommended to maintain measurement integrity.