Spi 29-073-4 Class Zz Plus Plug Gage 0.073 in

Product Description

The SPI 29-073-4 is a Class ZZ Plus plug gage used to verify the diameter of precision holes and bores in machined components. It is manufactured from steel and sized at 0.073 inches in diameter with a tolerance of 0.0002 inches, making it suitable for high-precision go/no-go inspection work. This type of gage is a standard tool in quality control environments, tool rooms, and machine shops where part conformance to dimensional specifications must be confirmed before components are accepted or advanced in production.

The 29-073-4 is applied in precision machining and manufacturing environments where small-diameter bore verification is required. It is used by machinists, quality technicians, and tool room professionals working with tight-tolerance parts across industries including aerospace, automotive, and general metalworking. Its compact size makes it appropriate for inspecting small holes in castings, housings, fixtures, and fabricated parts where standard measurement tools cannot achieve the required resolution.

Key Features

• Class ZZ Plus tolerance rating for precision go/no-go inspection applications
• 0.073 inch diameter for small-bore verification
• 0.0002 inch tolerance for high-accuracy dimensional checking
• Steel construction for durability and dimensional stability under repeated use
• Single-piece package quantity suits individual workstation or toolbox use

Compatibility

Designed as an OEM-style plug gage for use in quality control and inspection applications requiring 0.073 inch diameter bore verification in precision machining environments.

Installation Notes

Plug gages are handled and applied by quality control technicians and machinists; no installation is required. Store the gage in a protective case away from chips, coolant, and abrasive surfaces to preserve dimensional accuracy. Clean the gage and the bore being measured before use to prevent debris from affecting readings. Periodic calibration against certified reference standards is recommended to maintain measurement traceability.