Spi 29-033-8 Class Zz Plus Plug Gage 0.033 in Steel

Product Description

The SPI 29-033-8 is a Class ZZ Plus plug gage designed for precision measurement of small-diameter holes and bores. Machined from steel, this go/no-go style gage checks whether a drilled, reamed, or bored hole falls within specified tolerances. It measures a nominal diameter of 0.033 inches with a tolerance of 0.0002 inches, making it suitable for close-tolerance inspection work in manufacturing, machining, and quality control environments. Toolmakers, machinists, and QC inspectors rely on Class ZZ gages for production-floor and incoming inspection tasks where reliable, repeatable hole-size verification is required.

This plug gage is intended for use in inspection of small-diameter bored or drilled features in metal, plastic, or composite workpieces. It is well suited for production environments where multiple parts must be checked quickly against a fixed dimensional standard. The 0.033-inch nominal diameter targets fine-diameter features common in precision machined components, instrument parts, and hydraulic or pneumatic valve bodies.

Key Features

• Nominal measurement diameter of 0.033 inches for fine-bore inspection
• Tolerance of 0.0002 inches for high-accuracy Class ZZ Plus classification
• Steel construction for durability and dimensional stability
• Compact, single-piece format ready for immediate use out of the box
• Suitable for production-floor and quality control inspection applications

Compatibility

Designed as an OEM-style precision measurement tool for inspecting small-diameter holes and bores in production machining and quality assurance applications.

Installation Notes

Plug gages require no installation but should be handled with care to prevent damage to the precision-ground gage surface. Clean the gage and bore with a lint-free cloth before use to prevent debris from affecting measurement accuracy. Store the gage in its protective case when not in use to maintain surface condition and dimensional integrity. Calibration against a traceable standard is recommended at regular intervals per your facility quality plan.