Spi 10-749-0 Setting Ring 2.8 in Id 5 in Od

Product Description

The SPI 10-749-0 is a precision setting ring used to calibrate and verify bore gauges, plug gauges, and similar internal measurement instruments. With an inside diameter of 2.8 inches and an outside diameter of 4.92 inches, the ring provides a known, stable reference diameter that technicians use to zero their gauges before measurement. Accuracy is held to 0.00020 inches, and surface smoothness is 10 micrometers, supporting reliable, repeatable gauge setup in tool rooms, quality control labs, and machine shops.

This setting ring is suited for metrology and quality assurance applications across manufacturing, machining, and precision fabrication environments. It is typically used by quality technicians and tool room machinists to set internal bore measurement tools prior to inspection of machined bores and cylindrical features. The silver finish and hardened construction provide durability through repeated gauge contact cycles.

Key Features

• Inside diameter of 2.8 inches for precise bore gauge calibration
• Accuracy held to 0.00020 inches for reliable instrument setup
• Surface smoothness of 10 micrometers for consistent gauge contact
• Outside diameter of 4.92 inches provides stable handling surface
• Thickness of 0.94 inches supports steady gauge insertion and zeroing

Compatibility

Designed as a standard setting ring for use with bore gauges, plug gauges, and internal measurement instruments requiring a 2.8-inch reference diameter.

Installation Notes

Setting rings are handled and stored by metrology 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 and humidity to maintain dimensional stability. Do not drop or stack unsupported, as impact damage can compromise accuracy.