Spi 29-129-4 Class Zz Plus Plug Gage 0.129 in Dia

Product Description

The SPI 29-129-4 is a Class ZZ Plus plug gage used to verify bore and hole diameters to a nominal measurement of 0.129 inches. It is manufactured from steel and holds a tolerance of 0.0002 inches, making it suitable for dimensional inspection work in machine shops, toolrooms, and production environments. Machinists, quality control technicians, and precision manufacturing professionals use plug gages to confirm that drilled, reamed, or machined holes fall within acceptable specification limits. The Class ZZ Plus designation indicates this gage meets go/no-go inspection standards appropriate for general-purpose dimensional verification.

This plug gage is intended for use in shop-floor and inspection-room applications where small-diameter hole verification is required. It is well suited to checking holes in machined components, fixtures, and assemblies where tight tolerances must be confirmed before parts advance in a production process. The 0.129-inch nominal diameter makes it applicable to small-bore work common in precision machining and light manufacturing.

Key Features

• Nominal measurement diameter of 0.129 inches for small-bore hole inspection
• Class ZZ Plus tolerance rating of 0.0002 inches for general-purpose dimensional verification
• Steel construction for durability and wear resistance in shop environments
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Sold as an individual unit with a minimum order quantity of one

Compatibility

Designed as a general-purpose Class ZZ Plus plug gage for verifying bored, drilled, or reamed holes with a nominal diameter of 0.129 inches in machined components and assemblies.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians and do not require installation in the traditional sense. Before use, clean the gage and the hole being checked to remove chips, oil, and debris that could affect the measurement reading. Do not force a plug gage into an undersized hole, as this can damage the gage surface and compromise its accuracy. Store the gage in a protective case away from abrasive materials to maintain its tolerance rating over time.