Spi 29-251-6 Class Zz Plus Plug Gage 0.251 in

Product Description

The SPI 29-251-6 is a Class ZZ Plus plug gage used to inspect and verify bore diameters to a tight dimensional tolerance. It measures a nominal diameter of 0.251 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection routines in precision machining and manufacturing environments. Constructed from steel, this gage delivers the hardness and dimensional stability required for repeatable shop-floor measurement. It is handled by machinists, quality control inspectors, and toolroom technicians performing hole-size verification on machined components.

This plug gage is applied in machine shops, tool rooms, and quality inspection stations where bore accuracy must be confirmed before parts advance to assembly. Class ZZ Plus gages are typically used for production inspection of medium-tolerance holes. The 0.251-inch size fits applications where close hole diameter control is required, such as fit verification for pins, bushings, and similar precision hardware. Each unit is packaged individually.

Key Features

• Nominal measurement diameter of 0.251 inches for precise bore inspection
• Class ZZ Plus tolerance rating of 0.0002 inches ensures reliable go/no-go performance
• Steel construction provides hardness and wear resistance for repeated use
• Compact and lightweight at 0.2 pounds for easy single-hand handling
• Single-unit packaging suits individual toolroom and inspection station needs

Compatibility

Designed as a standard Class ZZ Plus plug gage for use in go/no-go bore inspection of holes with a nominal diameter of 0.251 inches in general precision machining and quality control applications.

Installation Notes

Plug gages are handled by machinists and QC inspectors and require no installation in the traditional sense, but proper gage handling practices apply. Clean the bore and gage surfaces before use to prevent debris from affecting measurement accuracy. Store the gage in a protective case away from other metal tools to avoid surface damage that could compromise tolerance. Calibration intervals should follow your facility's gage control program and applicable metrology standards.