Spi 29-145-0 Class Zz Plus Plug Gage 0.145 in

Product Description

The SPI 29-145-0 is a Class ZZ Plus plug gage designed for precision hole measurement in machining, inspection, and quality control applications. It measures bore diameters at 0.145 inches with a tolerance of 0.0002 inches, making it suitable for close-tolerance Go/No-Go verification work. Constructed from steel for dimensional stability and wear resistance, this gage is a standard tool in any metrology or inspection environment where repeatable, accurate inside-diameter checks are required.

This plug gage is used in machine shops, manufacturing facilities, and inspection departments to verify drilled, reamed, or bored holes to print specifications. Class ZZ Plus gages are appropriate for production inspection where consistent tolerance verification of small-diameter features is critical. Machinists, quality technicians, and tool-and-die professionals rely on this type of gage for routine hole qualification checks across a range of metal and precision-component work.

Key Features

• 0.145 inch nominal measurement diameter for small-bore inspection
• Class ZZ Plus tolerance class: 0.0002 inch tolerance for reliable Go/No-Go verification
• Steel construction for dimensional stability and long service life
• Compact, lightweight design at 0.2 pounds for easy bench or floor use
• Single-piece packaging suitable for individual tool crib or inspection kit use

Compatibility

Designed as a standard Class ZZ Plus plug gage for general-purpose Go/No-Go hole inspection of 0.145 inch diameter bores in production and quality control settings.

Installation Notes

Plug gages are handled and used by machinists and quality inspection technicians — no installation in a mechanical system is required. Store the gage in a clean, dry location away from chips, coolant, and temperature extremes to maintain calibration integrity. Handle with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Periodically verify the gage against a calibrated master or send it out for recalibration per your facility's gage control procedures.