Spi 3.60 Inches Spi Setting Ring 3.6 Id 6.25 Od 0.94 Thick

Product Description

The SPI 3.60" SPI is a precision setting ring used to calibrate and verify bore gauges, plug gauges, and other internal measuring instruments. The ring features a 3.6-inch inside diameter, a 6.25-inch outside diameter, and a thickness of 0.94 inches. Manufactured to an accuracy of 0.00020 inches and a surface smoothness of 10.0 micrometers, this setting ring supports reliable gauge calibration in tool rooms, machine shops, and quality control environments. Metrology technicians and machinists rely on setting rings to establish a traceable reference point before taking precision internal measurements.

This setting ring is suited for use in industrial and manufacturing environments where tight dimensional tolerances must be maintained. It serves as a master reference for resetting internal bore gauges prior to measurement runs. Typical applications include production inspection, incoming quality control, and calibration lab use. The silver finish and precision-ground surfaces make it appropriate for environments requiring repeatable and accurate gauge zeroing across high-volume measurement workflows.

Key Features

• Inside diameter of 3.6 inches for calibrating bore gauges and internal measuring tools
• Outside diameter of 6.25 inches and thickness of 0.94 inches for stable handling and mounting
• Accuracy of 0.00020 inches supports high-precision metrology applications
• Surface smoothness of 10.0 micrometers for consistent gauge contact and repeatable readings
• Silver finish with precision-ground bore surface
• Sold individually — package quantity of 1

Compatibility

Designed as an OEM-style master reference ring for use with bore gauges, air gauges, and plug gauge sets requiring a 3.6-inch internal diameter setting standard.

Installation Notes

Setting rings are handled and stored by metrology technicians and quality control personnel, not field tradespeople. Keep the ring clean and free of burrs, chips, or contaminants before use. Store in a protective case away from temperature extremes to prevent thermal expansion errors. Do not drop or stack with other metallic tools, as surface damage will compromise calibration accuracy.