Vermont Gage 111117800 Class Zz Plus Plug Gage 0.178 in

Product Description

The VERMONT GAGE 111117800 is a Class ZZ Plus plug gage designed to measure bore and hole diameters to a nominal size of 0.178 inches. Built from tool steel with a 10 microfinish surface, this gage delivers a tolerance of 0.0002 inches, making it suitable for precision go-inspection work. At 2.0 inches in overall length, it is compact and easy to handle on the shop floor or in the field. Each unit ships with a Certificate of Accuracy traceable to NIST, meeting ASME B89.1 standards. Machinists, quality control technicians, and toolroom professionals use this type of gage to verify that machined holes fall within specified dimensional tolerances.

This plug gage is used in go-inspection applications where confirming minimum acceptable hole size is critical. Typical uses include checking drilled, reamed, or bored holes in production machining, tool and die work, and precision assembly. It is also suited for setting and verifying micrometers, vernier calipers, and other measuring devices that require a known reference diameter. The 0.178-inch size targets small-bore applications common in hydraulic components, fastener clearance holes, and precision instrument housings.

Key Features

• Class ZZ Plus tolerance of 0.0002 inches for reliable go-inspection accuracy
• 10 microfinish surface for consistent contact and reduced wear on the gage and workpiece
• Tool steel construction for durability in production and toolroom environments
• Meets ASME B89.1 dimensional standards for plug gages
• Includes Certificate of Accuracy with NIST traceability
• Compact 2.0-inch overall length suited for benchtop and handheld use

Compatibility

Designed for use as a go plug gage in standard bore inspection setups and as a reference for setting micrometers, verniers, and other measuring devices requiring a 0.178-inch reference diameter.

Installation Notes

Plug gages should be handled and stored with care to prevent nicks, corrosion, or thermal distortion that could affect accuracy. Allow the gage and workpiece to stabilize at the same ambient temperature before inspection, as thermal expansion can introduce measurement error. Clean the gage and the bore being checked before use. Periodic recalibration against NIST-traceable standards is recommended to maintain measurement integrity over time.