Spi 29-295-3 Class Zz Plus Plug Gage 0.295 in

Product Description

The SPI 29-295-3 is a Class ZZ Plus plug gage designed to verify the internal diameter of bored, drilled, or reamed holes to a nominal size of 0.295 inches. It holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality-control environments. The gage is manufactured from steel for durability and dimensional stability under repeated use. Machinists, toolroom technicians, and quality inspectors use this type of gage to confirm that hole dimensions meet print specifications before assembly or further machining operations.

This plug gage is used in machine shops, manufacturing facilities, and toolrooms where tight hole tolerances must be verified. It is suited for inspecting workpieces in both production-line and bench-inspection settings. The 0.295-inch nominal diameter covers a common fractional and decimal hole size encountered in general metalworking and precision manufacturing. It is typically paired with a gage handle for use in standard go/no-go inspection routines.

Key Features

• Nominal measurement diameter of 0.295 inches for precise hole inspection
• Class ZZ Plus tolerance of 0.0002 inches meets standard inspection-grade requirements
• Steel construction provides wear resistance and long service life
• Compact and lightweight at 0.2 pounds for easy bench or in-process use
• Single-piece package quantity suits individual inspection or replacement needs

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for standard gage handle systems accepting 0.295-inch diameter go/no-go gage members in Class ZZ Plus tolerance applications.

Installation Notes

Plug gages are installed by quality technicians or machinists and require no tools for basic use beyond a compatible gage handle. Clean both the gage member and the workpiece hole before inspection to prevent false readings caused by chips or debris. Do not force the gage into an undersized hole, as this will damage the gage and compromise its calibration. Periodic recalibration against certified master gages is recommended to maintain measurement traceability.