Spi 19-027-2 Class Zz Minus Plug Pin Gage 0.027 in

Product Description

The SPI 19-027-2 is a Class ZZ minus plug pin gage machined to a 0.027-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are precision measurement tools used to verify hole diameters, bore sizes, and feature tolerances in machined or fabricated workpieces. The minus designation means the gage is ground to the lower limit of the tolerance band, making it suitable for go/no-go inspection workflows. Constructed from steel for durability and dimensional stability, this gage is a standard hand tool in quality control, toolroom, and production floor environments.

This gage is used wherever precise hole inspection is required — including machining shops, fabrication facilities, and manufacturing lines. It is appropriate for inspecting small-diameter bores and drilled holes in metal, plastic, and composite workpieces. Class ZZ gages are the most commonly used grade for general inspection work and production floor use, offering a balance of accuracy and cost. Machinists, quality technicians, and toolroom professionals reach for this class when verifying feature compliance to print tolerances.

Key Features

• 0.027-inch nominal diameter for small-bore inspection
• Class ZZ minus tolerance: 0.0002 inches, ground to lower limit of tolerance band
• Steel construction for wear resistance and dimensional stability
• Designed for go/no-go and attribute inspection workflows
• Compact, single-piece pin form for easy handling and storage

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose hole and bore inspection in machining and quality-control applications.

Installation Notes

Plug pin gages require no installation but should be handled with care to prevent surface damage that could affect measurement accuracy. Clean the gage and the workpiece bore before use to remove chips, oils, or debris that could cause false readings. Store the gage in a protective case or holder to prevent contact damage. Calibrate and inspect the gage periodically per your facility quality management procedures.