Spi 29-809-1 Class Zz Plus Plug Gage 0.809 in Dia

Product Description

The SPI 29-809-1 is a Class ZZ Plus plug gage designed to verify that a bored, drilled, or reamed hole meets a specified dimensional tolerance. It checks whether a hole accepts or rejects the nominal 0.809-inch diameter within a tolerance of 0.0002 inches. Machined from steel, this go/no-go style gage gives machinists and quality-control technicians a fast, reliable method for in-process or final inspection without requiring a measuring instrument at the point of check. It is a standard single-end cylindrical plug gage suited for precision hole verification in manufacturing, repair, and inspection environments.

This gage is used wherever a 0.809-inch nominal hole diameter must be confirmed to close tolerance. Typical applications include machine shops, toolrooms, production lines, and maintenance facilities performing work on hydraulic components, motor housings, bearing bores, or other precision-machined parts. It is handled by machinists, quality inspectors, and tool-and-die technicians performing dimensional verification on ferrous and non-ferrous workpieces.

Key Features

• Nominal measurement diameter of 0.809 inches for direct hole verification
• Class ZZ Plus tolerance of 0.0002 inches for high-accuracy go/no-go inspection
• Steel construction for durability and dimensional stability during repeated use
• Compact, lightweight design at 0.2 pounds for easy one-hand operation
• Single-piece design simplifies inspection workflow without additional setup

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring inspection of a 0.809-inch nominal diameter hole to Class ZZ Plus gage tolerance standards.

Installation Notes

Plug gages require no installation but should be handled with clean, dry hands or lint-free gloves to prevent corrosion and contamination of the gage surface. Verify the workpiece is at ambient temperature before gauging, as thermal expansion can affect readings. Store the gage in its protective case when not in use to prevent surface damage. Calibration and use should follow applicable ASME B89 or equivalent dimensional metrology standards for your facility.