Spi 29-049-4 Class Zz Plus Plug Gage 0.049 in Dia

Product Description

The SPI 29-049-4 is a Class ZZ Plus plug gage designed for precision bore and hole measurement in manufacturing and inspection environments. It measures a nominal diameter of 0.049 inches with a tolerance of 0.0002 inches, providing the accuracy required for go/no-go inspection of small-diameter holes. Constructed from steel, this plug gage is built to withstand repeated use in shop-floor and quality-control settings. Machinists, tool-and-die technicians, and quality inspectors rely on this type of gage for verifying hole size conformance to tight tolerances on production parts.

This plug gage is suited for small-diameter hole inspection in precision machining, fabrication, and assembly operations. It is commonly used in metrology labs, incoming inspection stations, and on CNC machining lines where hole size verification is part of the quality process. The 0.049-inch nominal size makes it appropriate for inspecting small drilled, reamed, or punched holes in metal, plastic, or composite workpieces. It is packaged as a single unit.

Key Features

• Class ZZ Plus tolerance class for reliable go/no-go inspection of small-diameter bores
• Nominal measurement diameter of 0.049 inches
• Tolerance of 0.0002 inches for high-precision dimensional verification
• Steel construction for durability and dimensional stability under shop conditions
• Single-unit packaging suitable for individual replacement or supplemental use

Compatibility

Designed as an OEM-style replacement or supplemental Class ZZ Plus plug gage for use in standard go/no-go gage sets and precision inspection applications requiring 0.049-inch diameter measurement.

Installation Notes

Plug gages of this type are handled and used by machinists, metrologists, and quality technicians. Clean both the gage and the workpiece bore before use to prevent debris from affecting the measurement or damaging the gage surface. Store the gage in a protective case away from other tools to prevent surface damage. Follow applicable shop metrology procedures and calibration schedules to maintain measurement traceability.