Spi 29-141-9 Class Zz Plus Plug Gage 0.141 Inch

Product Description

The SPI 29-141-9 is a Class ZZ Plus plug gage designed for precision hole measurement in machining, quality control, and inspection applications. Built from steel, this go/no-go style gage checks whether a drilled, reamed, or bored hole falls within acceptable dimensional limits. It measures a nominal diameter of 0.141 inches with a tolerance of 0.0002 inches, making it suitable for tight-tolerance production work where accurate bore verification is critical. Machinists, toolroom technicians, and quality inspectors use plug gages like this to confirm hole size compliance without requiring CMM or optical measurement equipment.

This gage is appropriate for use in manufacturing environments, job shops, and inspection stations where small-diameter hole verification is a routine task. It fits standard plug gage handles and is sized for use on holes nominally at 0.141 inches in diameter. Applications include checking clearance holes, threaded insert bores, and precision fits in metal, plastic, or composite workpieces. Its compact size and low weight make it easy to handle during high-volume part inspection.

Key Features

• Class ZZ Plus tolerance grade for plug gage accuracy at 0.0002 inches
• Nominal measurement diameter of 0.141 inches
• Steel construction for durability in shop environments
• Lightweight at 0.2 pounds for easy single-hand use
• Compatible with standard plug gage handle systems

Compatibility

Designed as an OEM-style replacement or standard addition to plug gage sets used for small-diameter hole inspection in general machining and quality control applications.

Installation Notes

Plug gages are installed by hand into standard gage handle bodies — no power tools or cutting fluids required during measurement. Clean both the gage and the workpiece bore before use to prevent false readings caused by debris or chip contamination. Store the gage in its protective case when not in use to avoid surface damage that can affect measurement accuracy. Inspection procedures should follow applicable shop or ISO quality standards for gage calibration intervals and handling.