Spi 19-874-7 Class Zz Minus Plug Pin Gage 0.874 in

Product Description

The SPI 19-874-7 is a Class ZZ minus plug pin gage machined to a 0.874-inch nominal diameter with a tolerance of 0.0002 inches. Pin gages in this class are go/no-go inspection tools used to verify bore diameters, hole sizes, and slot widths in machined components. The minus designation means the gage is ground below nominal, consistent with standard go-gage practice for checking minimum material condition. Steel construction provides durability and dimensional stability through repeated use. This gage is a standard tool in quality control, machine shop, and inspection department settings.

Class ZZ plug gages are the most widely used general-purpose inspection gages in production environments. The 19-874-7 is suited for checking bored holes, reamed holes, and drilled features in metal fabrication, tooling, and assembly inspection. It is appropriate for both incoming inspection and in-process quality checks where close-tolerance hole verification is required. Tool and die makers, machinists, and quality technicians are the primary users of this type of gage in industrial and manufacturing environments.

Key Features

• 0.874-inch nominal diameter for direct bore and hole inspection
• Class ZZ tolerance of 0.0002 inches for general-purpose inspection use
• Minus designation ground below nominal per standard go-gage convention
• Steel construction for dimensional stability and wear resistance
• Single-piece package quantity suitable for individual workstation use

Compatibility

Designed as a general-purpose Class ZZ minus plug gage for inspecting 0.874-inch nominal bores and holes in standard machined components across metalworking and manufacturing applications.

Installation Notes

Pin gages are inspection instruments, not installation components. Handle with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store in a protective case away from other tooling to avoid surface damage. Verify the gage is at ambient temperature before use, as thermal expansion can affect measurement accuracy at this tolerance class.