Spi 29-481-9 Class Zz Plus Plug Gage 0.481 in

Product Description

The SPI 29-481-9 is a Class ZZ Plus plug gage machined to a 0.481-inch nominal diameter with a tolerance of 0.0002 inches. Plug gages are precision go/no-go inspection tools used to verify bore and hole dimensions during manufacturing, quality control, and machining operations. The ZZ classification designates a working-grade tolerance suitable for production floor inspection. Constructed from steel, this gage delivers the hardness and dimensional stability required for repeated use in shop environments. Machinists, quality technicians, and tool room personnel are the primary users.

This plug gage is used to inspect drilled, reamed, or bored holes where tight dimensional control is required. It is suited for general production inspection in machine shops, fabrication facilities, and precision manufacturing environments. The 0.481-inch diameter makes it appropriate for small-bore applications where maintaining close fits and positional tolerances is critical to assembly function. It is a single-piece, individual-size gage rather than a handle-mounted set.

Key Features

• Class ZZ Plus tolerance grade for production-floor go/no-go inspection
• 0.481-inch nominal diameter with 0.0002-inch tolerance
• Steel construction for durability and dimensional stability
• Lightweight at 0.2 pounds for easy single-hand use
• Single-piece individual gage — no handle assembly required

Compatibility

Designed as a working-grade Class ZZ Plus plug gage for inspection of 0.481-inch nominal bores in general production and quality control applications.

Installation Notes

Plug gages are inspection tools and do not require installation in the traditional 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 a plug gage into a bore — excessive insertion force can cause premature wear and skew inspection results. Periodic calibration against a traceable standard is recommended to confirm the gage remains within tolerance.