Spi 29-185-6 Class Zz Plus Plug Gage 0.185 in

Product Description

The SPI 29-185-6 is a Class ZZ Plus plug gage designed for precision dimensional inspection of small-diameter bores and holes. Built from steel, this go/no-go style gage checks whether a hole or bore meets a specified diameter of 0.185 inches with a tolerance of 0.0002 inches. Class ZZ Plus gages are standard tools in quality control, machine shops, and production environments where tight dimensional verification is required. Machinists, quality technicians, and tool-and-die professionals use plug gages like this to verify drilled, reamed, or bored openings against print tolerances without relying on indirect measurement instruments.

This gage is suited for use in manufacturing, fabrication, and inspection settings where hole size conformance must be confirmed quickly and reliably. At 0.185 inches nominal diameter, it covers a common small-bore range found in precision machined components, fixtures, and assemblies. It is appropriate for use in both high-volume production line inspection and bench-level quality checks in job shop environments.

Key Features

• Nominal diameter of 0.185 inches for direct bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for precise go/no-go verification
• Steel construction for durability and dimensional stability
• Compact and lightweight at 0.2 pounds for easy single-hand use
• Single-piece unit quantity — no assembly required

Compatibility

Designed as an OEM-style plug gage for use with standard 0.185-inch nominal bore inspection applications in general precision machining and quality control workflows.

Installation Notes

Plug gages require no installation but should be handled with care to avoid nicks or surface contamination that could affect measurement accuracy. Always clean the bore and the gage contact surface before use. Store in a protective case away from other metal tools to prevent damage to the gage surface. Calibration and periodic inspection against gage blocks or a reference standard is recommended per your shop quality plan.