Spi 29-187-2 Class Zz Plus Plug Gage 0.187 Inch

Product Description

The SPI 29-187-2 is a Class ZZ Plus plug gage designed for precision hole measurement in machining, inspection, and quality-control applications. It measures a nominal diameter of 0.187 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where tight dimensional verification is required. Constructed from steel, the gage provides the durability needed for repeated use in production and shop-floor environments. Machinists, tool-and-die makers, and quality inspectors use plug gages like this one to verify bore sizes against print tolerances without the variability introduced by handheld measuring instruments.

This plug gage is used in machine shops, manufacturing facilities, and inspection departments where hole diameter conformance must be verified to close tolerances. It is appropriate for checking drilled, reamed, or bored holes in ferrous and non-ferrous workpieces. The 0.187-inch diameter size corresponds to a common fractional and drill-size range frequently encountered in general metalworking and precision fabrication. It is sold individually and is ready for use as received or after calibration verification per shop standards.

Key Features

• Class ZZ Plus tolerance class for precision go/no-go hole inspection
• Nominal measurement diameter of 0.187 inches
• Tolerance of 0.0002 inches for tight dimensional verification
• Steel construction for durability and wear resistance in production environments
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Sold as individual unit with minimum order quantity of one

Compatibility

Designed as an OEM-style precision inspection tool for verifying 0.187-inch nominal bore diameters in standard go/no-go gage handle sets and direct hand-held use in machine shop and quality inspection applications.

Installation Notes

Plug gages are handled and used by machinists, quality technicians, and inspection personnel — no power tools or electrical shutoff is required. Store the gage in a protective case away from abrasive surfaces to prevent wear on the gage surface. Clean the gage and the bore being checked before use to avoid false readings caused by chips or debris. Periodic calibration against a certified master is recommended to maintain traceability to dimensional standards.