Spi 19-655-0 Class Zz Minus Plug Pin Gage 0.655 in

Product Description

The SPI 19-655-0 is a Class ZZ minus plug pin gage machined to a nominal diameter of 0.655 inches with a tolerance of 0.0002 inches. This single-end pin gage is used to verify that a hole or bore falls within a specified dimensional range. It is constructed from steel for durability and dimensional stability under repeated use. Class ZZ represents the most widely used tolerance class for shop-floor go/no-go inspection work. Machinists, quality control technicians, and tool-room personnel use this type of gage to confirm conformance to print on drilled, reamed, or bored features.

This plug gage is suited for inspection tasks in general manufacturing, machining shops, and production environments where hole size verification is part of a standard quality process. It applies to checking holes in metal, plastic, or composite workpieces where dimensional accuracy is critical. The minus designation indicates the gage is ground to the lower tolerance boundary, confirming that a hole has been opened to at least the minimum acceptable size.

Key Features

• 0.655 inch nominal diameter for direct hole inspection at that size
• Class ZZ tolerance class — standard for shop and production floor use
• Minus designation confirms lower tolerance boundary measurement
• 0.0002 inch tolerance for reliable go/no-go determination
• Steel construction for wear resistance and dimensional stability
• Single-piece packaging suitable for individual or replacement use

Compatibility

Designed as an OEM-style inspection gage for use in standard plug gage handles sized to accept 0.655 inch diameter pin gages in Class ZZ tolerance applications.

Installation Notes

Pin gages are installed by pressing or sliding the gage pin into a compatible gage handle — no permanent fastening is required. Clean the gage pin and the bore being inspected before use to prevent debris from skewing the measurement. Store pin gages in their case or protective sleeve when not in use to prevent nicks or corrosion that would affect dimensional accuracy. Gages should be periodically recalibrated against traceable standards in accordance with your shop quality management procedures.