Spi 29-994-1 Class Zz Plus Plug Gage 0.994 in Dia

Product Description

The SPI 29-994-1 is a Class ZZ Plus plug gage designed to verify that a bore or hole falls within a specified dimensional tolerance. The gage measures a nominal diameter of 0.994 inches and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection routines on machined parts. Constructed from steel, it provides the rigidity and wear resistance expected in a production or inspection environment. Machinists, quality technicians, and tool-room professionals use plug gages like this to confirm hole sizes during in-process and final inspection.

This plug gage is used in manufacturing, machining, and quality control settings where tight-tolerance hole verification is required. It is appropriate for inspecting drilled, reamed, or bored holes in metal, plastic, or composite workpieces. Class ZZ Plus designation indicates the gage conforms to tolerance standards appropriate for general-purpose inspection work. It is suited to both job-shop and production environments where consistent, repeatable measurement of 0.994-inch diameter features is needed.

Key Features

• Nominal measurement diameter of 0.994 inches for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose inspection accuracy
• Steel construction provides durability and dimensional stability during repeated use
• Compact single-unit package suitable for bench, floor, or tool-room use
• Tolerance also expressed as 0.0002 mm for dual-unit reference

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose go/no-go inspection of machined bores and holes at a nominal diameter of 0.994 inches.

Installation Notes

Plug gages are handled and used by quality technicians and machinists and do not require installation in the traditional sense. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect the reading. Store the gage in its protective case when not in use to prevent nicks or corrosion that would compromise accuracy. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity.