Spi 29-453-8 Class Zz Plus Plug Gage 0.453 in

Product Description

The SPI 29-453-8 is a Class ZZ Plus plug gage designed for go/no-go inspection of machined bores and drilled holes with a nominal diameter of 0.453 inches. Built from steel, it delivers a tolerance of 0.0002 inches, meeting the dimensional accuracy requirements of Class ZZ Plus gaging standards. This gage is used by machinists, tool-and-die makers, and quality control technicians to verify that hole diameters fall within specified acceptance limits. It is a single-ended gage suitable for production-floor and inspection-room use where repeatable, reliable dimensional verification is required.

This plug gage is suited for inspecting holes in metal and engineered plastic components across light manufacturing, precision machining, and general fabrication environments. It is appropriate for both incoming inspection and in-process quality checks where hole diameter acceptance criteria must be confirmed before assembly. The 0.453-inch measurement size covers a common range of drilled and reamed hole applications in both inch-dimensioned work.

Key Features

• Class ZZ Plus tolerance rating at 0.0002 inches for high-accuracy hole inspection
• Nominal measurement diameter of 0.453 inches
• Steel construction for durability and dimensional stability
• Lightweight at 0.2 pounds for comfortable hand use during inspection
• Single-unit packaging suitable for individual replacement or small-quantity toolroom stocking

Compatibility

Designed as an OEM-style replacement or direct toolroom addition for Class ZZ Plus plug gage sets requiring a 0.453-inch diameter member. Verify nominal diameter and tolerance class against your existing gage set specifications before ordering.

Installation Notes

Plug gages require no permanent installation. Handle with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store in a protective case away from abrasive surfaces when not in use. Calibration against a traceable reference standard is recommended at regular intervals per your facility quality plan.