Spi 29-775-4 Class Zz Plus Plug Gage 0.775 Inch

Product Description

The SPI 29-775-4 is a Class ZZ Plus plug gage designed for go/no-go inspection of bored holes, drilled openings, and machined features requiring a 0.775-inch nominal diameter check. Built from steel, this plug gage holds a tolerance of 0.0002 inches, meeting Class ZZ Plus accuracy standards. It is used to verify that a workpiece hole falls within a specified dimensional tolerance, providing a fast, repeatable pass/fail result without requiring measurement instruments at the point of inspection. Machinists, quality technicians, and toolroom personnel are the primary users of this type of precision gage.

This plug gage is suited for use in production inspection environments, toolrooms, and machine shops where hole diameter conformance must be confirmed quickly and reliably. It is appropriate for both incoming inspection of purchased components and in-process verification on the shop floor. The 0.775-inch diameter size targets a specific common bore dimension in precision-machined assemblies. Its compact form factor and light weight of 0.2 pounds make it practical for bench use or line-side inspection stations.

Key Features

• Class ZZ Plus accuracy with 0.0002-inch tolerance for reliable pass/fail hole inspection
• 0.775-inch nominal diameter targets a precise bore size in machined components
• Steel construction provides durability and resistance to wear during repeated use
• Lightweight at 0.2 pounds, suitable for bench or line-side inspection
• Single-piece packaging with a minimum order quantity of one unit

Compatibility

Designed as an OEM-style Class ZZ Plus plug gage for use in any shop or inspection application requiring verification of a 0.775-inch diameter bore.

Installation Notes

Plug gages should be handled by quality technicians or toolroom personnel following standard metrology practices. Clean and deburr the workpiece hole before gaging to prevent damage to the gage surface and ensure accurate results. Store the gage in a protective case away from other tooling to avoid nicks or surface damage that could affect accuracy. Periodic calibration against traceable standards is recommended to maintain gage integrity over time.