Spi 29-150-0 Class Zz Plus Plug Gage 0.15 Inch

Product Description

The SPI 29-150-0 is a Class ZZ Plus plug gage used to verify the diameter of machined holes and bores to a tight tolerance. It measures 0.15 inches in diameter and holds a tolerance of 0.0002 inches, making it suitable for precision inspection work in manufacturing, machining, and tool rooms. Constructed from steel, this go/no-go style gage provides a reliable, repeatable check of hole size conformance. Machinists, quality control technicians, and tool and die professionals use plug gages like this one to confirm that drilled, reamed, or bored holes fall within specified dimensional limits before parts advance to the next stage of production.

This plug gage is suited for use in precision machining shops, production lines, and inspection departments where hole-diameter verification is required. The 0.15 inch size targets small-bore applications common in component manufacturing, fixture work, and close-tolerance assembly. Class ZZ Plus designation indicates the gage meets the tolerance standards for this accuracy class, appropriate for inspection of standard commercial-grade parts.

Key Features

• 0.15 inch measurement diameter for small-bore hole inspection
• 0.0002 inch tolerance for precise dimensional verification
• Steel construction for durability and wear resistance
• Class ZZ Plus rating meets established gage tolerance standards
• Compact, single-piece design for easy bench or in-process use

Compatibility

Designed as an OEM-style plug gage for verifying 0.15 inch diameter holes in standard precision machining and inspection applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians — no installation in the traditional sense applies. Store the gage in a protective case or sleeve when not in use to prevent damage to the precision-ground surface. Clean the gage and the hole being measured before use to avoid false readings caused by chips, coolant, or debris. Handle with care; dropping or striking the gage against hard surfaces can affect calibration and dimensional accuracy.