Spi 22-161-4 Class Zz Plug Gage Set 0.917-1 in 84 Pc

Product Description

The SPI 22-161-4 is a Class ZZ plug gage set covering a diameter range of 0.917 to 1 inch in 84 individual pieces. Each pin is manufactured from steel to a plus-tolerance of 0.0002 inches, meeting NIST-traceable standards. The set is used to verify hole sizes, slot widths, and center distances with fast, repeatable go-gage inspection results. A certificate of accuracy and a pin gage holder are included with every set. Machinists, quality technicians, and tool-room inspectors use this type of set for incoming inspection, in-process checks, and final part acceptance on the shop floor or in the metrology lab.

This plug gage set is suited for both production and inspection environments where hole tolerances fall in the 0.917 to 1 inch range. Typical applications include measuring drilled, reamed, or bored holes in metal and plastic components, checking slot widths, and calculating center-to-center distances between holes. The 84-piece coverage across the range makes it practical for shops running mixed part families without needing multiple individual pin gages.

Key Features

• Class ZZ tolerance rating at plus 0.0002 inches per pin for reliable go-gage inspection
• Full range coverage from 0.917 to 1 inch in 84 steel pins
• NIST-traceable certificate of accuracy included for quality documentation
• Pin gage holder included to organize and protect the full set
• Steel construction for durability in production and inspection environments
• Suitable for measuring hole sizes, slot widths, and inter-hole distances

Compatibility

Designed for use in standard plug gage inspection applications where hole diameters fall between 0.917 and 1 inch; compatible with common pin gage holders and go-gage inspection fixtures used in general machining and quality control workflows.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and metrologists — no permanent installation is required. Clean the pins and the workpiece bore before use to prevent debris from affecting measurement accuracy. Store pins in the included holder when not in use to prevent damage to the precision ground surfaces. Avoid dropping or forcing pins, as surface damage will compromise tolerance integrity.