Spi 29-415-7 Class Zz Plus Plug Gage 0.415 in

Product Description

The SPI 29-415-7 is a Class ZZ Plus plug gage designed for precision hole measurement in machining, manufacturing, and quality control environments. With a nominal diameter of 0.415 inches and a tolerance of 0.0002 inches, this gage delivers the accuracy required for verifying drilled, reamed, or bored holes to tight dimensional standards. Constructed from steel for durability and wear resistance, it is a go/no-go style instrument used by machinists, tool and die makers, and quality control technicians in production and inspection settings.

Class ZZ Plus plug gages are suited for inspection of medium-tolerance holes in general manufacturing applications. This gage is appropriate for use in job shops, production facilities, and metrology labs where consistent hole verification is part of standard quality assurance workflow. The compact size and low weight of 0.2 pounds make it easy to handle during routine inspection tasks.

Key Features

• Nominal measurement diameter of 0.415 inches for precise hole gauging
• Class ZZ Plus tolerance of 0.0002 inches for reliable dimensional verification
• Steel construction for long service life and resistance to wear
• Lightweight at 0.2 pounds for comfortable hand use during inspection
• Single-piece package quantity suited for individual or small-quantity procurement

Compatibility

Designed as an OEM-style inspection instrument for verifying 0.415-inch nominal diameter holes in standard manufacturing and quality control applications.

Installation Notes

Plug gages are handled and used by machinists, quality control technicians, and metrologists — no installation in the traditional sense is required. Store the gage in its protective case when not in use to prevent damage to the precision ground surface. Clean the gage and the hole being measured before use to avoid false readings caused by debris or coolant residue. Handle with care to prevent dropping, which can alter the ground diameter and compromise measurement accuracy.