Spi 29-854-7 Class Zz Plus Plug Gage 0.854 in Dia

Product Description

The SPI 29-854-7 is a Class ZZ Plus plug gage designed for precision dimensional inspection of bores and holes with a nominal diameter of 0.854 inches. Manufactured from steel, this go/no-go style gage provides a tolerance of 0.0002 inches, making it suitable for quality control checks in machining, fabrication, and production environments. Machinists, quality technicians, and toolroom professionals use plug gages like this to verify that a drilled, reamed, or bored hole falls within acceptable dimensional limits before parts advance to the next stage of manufacturing.

This plug gage is used in machine shops, tool rooms, and production floors where repeatable, reliable bore measurement is required. Class ZZ Plus gages are appropriate for general-purpose inspection work where tight tolerances must be verified quickly and accurately. The 0.854-inch diameter targets a specific bore size common in precision component manufacturing and fixture work. This gage is suited for both incoming inspection of raw materials and in-process checks on machined parts.

Key Features

• Nominal measurement diameter of 0.854 inches for targeted bore inspection
• Class ZZ Plus classification with 0.0002-inch tolerance for general-purpose precision measurement
• Steel construction for durability and dimensional stability during repeated use
• Compact and lightweight at 0.2 pounds for easy handling at the bench or on the floor
• Single-piece packaging suitable for individual toolroom or inspection station use

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose bore inspection of holes with a 0.854-inch nominal diameter in machining and quality control applications.

Installation Notes

Plug gages are hand-held inspection tools and do not require installation in the conventional sense, but proper handling is essential to maintain accuracy. Keep the gage clean and lightly oiled when not in use to prevent corrosion on the steel surface. Never force the gage into a bore, as this can cause wear or damage to both the gage and the workpiece. Store in a protective case away from impact and temperature extremes to preserve calibration.