Spi 19-235-1 Class Zz Minus Plug Pin Gage 0.235 in

Product Description

The SPI 19-235-1 is a Class ZZ minus plug pin gage designed to verify hole dimensions with precision in production and inspection environments. It measures 0.235 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where dimensional accuracy is critical. Constructed from steel, this gage is built to withstand repeated use in shop-floor conditions. Machinists, quality control technicians, and tool-and-die professionals use plug pin gages as a fast, reliable method for checking bore size without the need for measuring instruments that require calibration reads.

This gage is suited for production inspection of drilled, reamed, or bored holes in manufacturing and machining operations. The minus designation indicates the gage is ground to the lower limit of the nominal diameter, which is standard practice for go-gage applications. It fits into inspection routines at machine shops, tooling departments, and quality assurance stations handling small-diameter bores in the 0.235-inch range.

Key Features

• 0.235-inch nominal diameter for precise small-bore inspection
• Class ZZ tolerance class — standard for commercial and production plug gages
• Minus designation: ground to the lower limit of nominal diameter
• 0.0002-inch tolerance for consistent dimensional verification
• Steel construction for durability in shop-floor use
• Lightweight at 0.2 pounds — easy to handle during repetitive inspection tasks

Compatibility

Designed as an OEM-style plug pin gage for use in standard go/no-go inspection applications involving 0.235-inch nominal diameter bores.

Installation Notes

Plug pin gages are handled and used by machinists and quality technicians — no permanent installation is required. Before use, clean the gage and the bore being checked to remove chips, coolant, or debris that could affect the reading. Store the gage in a protective case when not in use to prevent damage to the ground surface. Do not force the gage into a bore; resistance indicates the hole is undersize or contains contamination.