Spi 29-600-4 Class Zz Plus Plug Gage 0.6 Inch

Product Description

The SPI 29-600-4 is a Class ZZ Plus plug gage designed for precision bore measurement in manufacturing and inspection environments. This go/no-go style gage checks whether a drilled, reamed, or bored hole meets tolerance requirements at a nominal diameter of 0.6 inches, with a tolerance of 0.0002 inches. Constructed from steel for durability and dimensional stability, the 29-600-4 delivers consistent, repeatable results on the shop floor or in a quality control lab. It is a straightforward tool for machinists, toolmakers, and quality inspectors who need reliable hole verification without complex setup.

The SPI 29-600-4 is suited for use in machine shops, tool rooms, and production inspection stations where hole diameter acceptance or rejection must be confirmed quickly and accurately. Typical applications include verifying bored holes in metal components, checking drilled and reamed features during in-process inspection, and performing final dimensional checks before part acceptance. The 0.6-inch nominal diameter makes it applicable across a wide range of small-to-mid-size machined components.

Key Features

• Class ZZ Plus tolerance rating for precision bore verification
• Nominal measurement diameter of 0.6 inches
• Tolerance of 0.0002 inches for high-accuracy inspection
• Steel construction for wear resistance and long service life
• Lightweight at 0.2 pounds for easy single-hand use during inspection

Compatibility

Designed as an OEM-style precision inspection tool for use in any application requiring go/no-go bore verification at a 0.6-inch nominal diameter per Class ZZ Plus gage standards.

Installation Notes

Plug gages of this type are handled by machinists, toolmakers, or quality control technicians — no power source or mechanical installation is required. Before use, clean both the gage and the bore surface to remove chips, coolant, or debris that could affect measurement accuracy. Do not force the gage into an undersized bore; apply light, even hand pressure only. Store the gage in a protective case and calibrate periodically against certified master rings to maintain traceability.