Spi 19-635-2 Class Zz Minus Plug Pin Gage 0.635 in

Product Description

The SPI 19-635-2 is a Class ZZ minus plug pin gage with a 0.635-inch nominal diameter, used to verify that a hole or bore meets minimum acceptable size requirements. Manufactured from steel, it delivers a tolerance of 0.0002 inches, conforming to Class ZZ standards appropriate for general inspection and production-floor go/no-go gauging applications. The minus designation means the gage is ground to the lower tolerance limit, confirming that a feature is at least as large as specified. Machinists, quality technicians, and tool-room professionals use plug pin gages like this one to check bores, drilled holes, and reamed features during in-process and final inspection.

This gage is suited for use in manufacturing, metalworking, and machining environments where hole diameter verification is part of standard quality control workflow. It is appropriate for both job-shop and production settings where a 0.635-inch nominal diameter bore must be confirmed within Class ZZ tolerance limits. The steel construction provides durability for repeated use in shop-floor conditions. At 0.2 pounds, the gage is lightweight and easy to handle during inspection routines.

Key Features

• Class ZZ minus tolerance designation for minimum bore size verification
• 0.635-inch nominal diameter for direct hole inspection at that size
• Tolerance of 0.0002 inches for reliable Class ZZ general-inspection accuracy
• Steel construction for shop-floor durability and repeated use
• Lightweight at 0.2 pounds for easy single-hand operation

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for inspection of 0.635-inch nominal diameter bores and holes in standard machining and quality-control applications.

Installation Notes

Plug pin gages are handled by quality technicians and machinists and require no power or special tooling for use. Clean the gage and the bore being inspected before use to prevent debris from affecting measurement accuracy. Do not force the gage into a hole; if resistance is encountered, the bore may be undersize. Store the gage in its protective case when not in use to prevent nicks or surface damage that could affect tolerance accuracy.