Spi 19-012-4 Class Zz Minus Plug Pin Gage 0.012 in

Product Description

The SPI 19-012-4 is a Class ZZ minus plug pin gage designed for precision measurement of small-diameter bores and holes. Built from steel, this pin gage delivers a nominal diameter of 0.012 inches with a tolerance of 0.000200 inches, making it suitable for go/no-go inspection work where tight dimensional verification is required. Class ZZ designates this gage for general inspection use. Machinists, quality control technicians, and toolroom professionals rely on pin gages like the 19-012-4 to verify hole sizing on machined components, fixtures, and assemblies.

The SPI 19-012-4 is used in manufacturing, machining, and inspection environments where small-diameter holes must be verified against tight tolerances. It is well suited for incoming inspection, in-process quality checks, and final verification on precision-machined parts. The minus designation indicates the gage is manufactured to the lower end of the tolerance range, as is standard for Class ZZ plug gages used in go-gage applications.

Key Features

• Class ZZ minus tolerance classification for general inspection use
• 0.012 inch nominal diameter for small-bore measurement
• Steel construction for durability and dimensional stability
• 0.000200 inch tolerance for precise go/no-go verification
• Single-piece package quantity for individual toolroom or inspection use

Compatibility

Designed as a standard Class ZZ plug pin gage suitable for use with pin gage handle sets and gage blocks in typical machining and quality inspection applications.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion and contamination that can affect measurement accuracy. Store the gage in its case or on a clean surface away from other metal tools to avoid nicks or damage to the gage surface. Always clean and inspect the gage before use. Calibration and use should follow your facility's established measurement system and applicable ASME B89 standards for plain plug gages.