Spi 29-444-7 Class Zz Plus Plug Gage 0.444 in Dia

Product Description

The SPI 29-444-7 is a Class ZZ Plus plug gage used to verify the inside diameter of bored, reamed, or machined holes to a nominal size of 0.444 inches. It holds a tolerance of 0.0002 inches, placing it within the ZZ Plus accuracy class suited for go/no-go inspection work in production and quality-control environments. The gage body is constructed from steel for dimensional stability and resistance to wear during repeated gauging cycles. Machinists, quality inspectors, and tool-room technicians use this type of gage to confirm that hole diameters fall within acceptable limits before parts advance in the manufacturing process.

This plug gage is appropriate for use in machine shops, fabrication facilities, and manufacturing plants where tight hole-diameter tolerances must be confirmed. It is used on metal parts produced by drilling, reaming, boring, or broaching operations. The 0.444-inch nominal diameter targets a specific hole size common in general mechanical assembly and precision component manufacturing. Each unit is packaged individually, making it practical for bench-level inspection stations.

Key Features

• 0.444-inch nominal measurement diameter for precise hole inspection
• Class ZZ Plus tolerance of 0.0002 inches ensures accurate go/no-go gauging
• Steel construction provides durability and dimensional stability under repeated use
• Lightweight at 0.2 pounds, easy to handle during bench or floor inspection
• Single-unit packaging supports individual workstation deployment

Compatibility

Designed as an OEM-style inspection tool compatible with any application requiring go/no-go verification of a 0.444-inch inside diameter hole in standard Class ZZ Plus gauging programs.

Installation Notes

Plug gages are handled and used by machinists or quality-control inspectors, not installed permanently. Clean the gage and the hole being measured before each use to prevent debris from affecting readings. Store the gage in a protective case away from temperature extremes to preserve dimensional accuracy. Calibration against a traceable master reference is recommended on a scheduled interval consistent with your facility quality program.