Spi 19-159-3 Class Zz Minus Plug Pin Gage 0.159 in

Product Description

The SPI 19-159-3 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions to tight tolerances. This gage checks whether a feature falls within the specified lower limit by using the minus tolerance convention, confirming that a hole is not undersized. With a nominal diameter of 0.159 inches and a tolerance of 0.0002 inches, this pin gage is suited for quality-control inspection tasks where precise dimensional verification is required. Machinists, toolmakers, and quality technicians use pin gages like this one as part of standard go/no-go inspection routines on the shop floor or in the inspection room.

This gage is used in manufacturing, machining, and precision fabrication environments for inspecting drilled, reamed, or punched holes in metal, plastic, or composite workpieces. The 0.159-inch diameter makes it appropriate for small-bore inspection applications common in aerospace, automotive, and general industrial production. It functions as a single-piece hand gage and requires no special fixtures for basic use, making it practical for inline inspection as well as bench use.

Key Features

• Class ZZ tolerance grade for general-purpose inspection applications
• Minus plug designation confirms the gage is ground to the lower tolerance limit
• 0.159-inch nominal diameter for small-bore hole verification
• Tolerance of 0.0002 inches provides reliable dimensional control
• Steel construction for durability and wear resistance under repeated use
• Single-piece design for straightforward hand use without additional fixtures

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard go/no-go inspection setups where a 0.159-inch diameter bore check is required.

Installation Notes

Pin gages are handled by quality technicians and machinists and require no installation tools. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Do not force the gage into a hole; resistance indicates the feature is undersized. Store in a protective case away from impact and temperature extremes to preserve calibration integrity.