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The SPI 15-016-9 is a rectangular steel gage block measuring 0.102 inches, manufactured to Grade AS-1 accuracy and supplied with NIST certification. Gage blocks are precision reference standards used to calibrate measuring instruments, set comparators, and verify dimensional tolerances in machining and inspection environments. The AS-1 grade designation indicates a high level of dimensional accuracy, making this block appropriate for use in tool rooms, quality labs, and precision manufacturing applications. It is handled and deployed by machinists, metrology technicians, and quality control professionals who require traceable measurement standards.
This block is suited for applications in precision dimensional inspection, instrument calibration, and setup verification. It is commonly used alongside micrometers, height gages, and surface plates. The NIST certification provides documented traceability to national measurement standards, which is required in many ISO 9001, AS9100, and similar quality management environments. Its rectangular form follows standard gage block geometry for easy wringing and stacking with other blocks in a set.
Designed as a standard rectangular steel gage block compatible with conventional gage block sets and accessories that follow industry-standard geometry for wringing and stacking applications.
Gage blocks are handled by metrology technicians and precision machinists in calibration lab or tool room settings. Before use, clean contact surfaces thoroughly to remove oils and debris, as contamination affects wringing and measurement accuracy. Store blocks in their protective case when not in use to prevent corrosion and surface damage. Do not drop or impact the block against hard surfaces, as this can alter the precision-ground faces.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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