Spi 19-018-1 Class Zz Minus Plug Pin Gage 0.018 in

Product Description

The SPI 19-018-1 is a Class ZZ minus plug pin gage designed to verify hole diameters at a nominal size of 0.018 inches. It is a go/no-go style precision measurement tool used to confirm that a drilled, reamed, or punched hole falls within a specified tolerance. Constructed from steel, this gage carries a tolerance of 0.0002 inches, which is consistent with ANSI Class ZZ standards for workshop-grade inspection. It is used primarily by machinists, toolmakers, quality control technicians, and precision fabricators who need reliable, repeatable hole verification during production or inspection workflows.

This pin gage is suited for light production and inspection environments where Class ZZ tolerances are acceptable for the application. The minus designation means the gage is ground below nominal, making it appropriate for checking minimum material condition on close-tolerance holes. It fits into standard pin gage handle sets and is used across a range of industries including precision machining, aerospace component fabrication, tool and die, and general metalworking shops. Individual pins like this one are commonly used to build out or replace worn members in an existing gage set.

Key Features

• Nominal diameter of 0.018 inches for small-hole inspection
• Class ZZ tolerance grade: 0.0002 inches, per ANSI workshop standards
• Minus designation for below-nominal ground gages
• Steel construction for durability in shop environments
• Compatible with standard pin gage handles for single-pin use

Compatibility

Designed as a replacement or supplemental pin for use with standard pin gage handle sets that accept 0.018-inch diameter members. Specific handle compatibility should be confirmed based on the handle manufacturer's accepted pin diameter range.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Before use, inspect the pin for nicks, burrs, or surface damage that could affect measurement accuracy. Store individually or in a protective case to prevent contact with other metal tools. Calibration verification against a known standard is recommended before critical inspection use.