Spi 19-144-5 Class Zz Minus Plug Pin Gage 0.144 in

Product Description

The SPI 19-144-5 is a Class ZZ minus plug pin gage used to verify hole diameters and bore sizes with precision. Measuring 0.144 inches in diameter, it is manufactured from steel for durability and dimensional stability under repeated use. The minus tolerance designation means the gage is ground to the low side of the tolerance band, following standard GO gage practice. With a tolerance of 0.0002 inches, it suits applications where tight dimensional control is required. Machinists, quality control technicians, and tool-and-die professionals use plug pin gages as part of incoming inspection, in-process verification, and final part acceptance.

This gage is suited for use in machine shops, manufacturing facilities, and quality labs where hole diameter verification is part of the production or inspection workflow. It is used to check drilled, reamed, or bored holes in metal, plastic, and composite workpieces. The compact size and steel construction make it practical for both bench inspection and floor-level production checks.

Key Features

• Class ZZ minus tolerance designation for GO gage applications
• 0.144 inch nominal diameter for precise small-bore verification
• 0.0002 inch tolerance for high-accuracy dimensional inspection
• Steel construction for wear resistance and long service life
• Single-piece package quantity for individual tooling needs

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for standard Class ZZ minus gage applications requiring a 0.144 inch diameter.

Installation Notes

Plug pin gages are handled and used by machinists or quality inspection personnel — no installation in the traditional sense applies. Clean the gage and the bore being checked before use to prevent debris from affecting the reading. Store the gage in a protective case away from moisture and contaminants to preserve the ground surface finish. Calibration should be verified periodically in accordance with your facility's quality management procedures.