Spi 19-252-6 Class Zz Minus Plug Pin Gage 0.252 in

Product Description

The SPI 19-252-6 is a Class ZZ minus plug pin gage machined from steel, designed for checking the minimum acceptable size of drilled, reamed, or machined holes. At 0.252 inches in diameter with a tolerance of 0.0002 inches, this gage provides reliable go/no-go inspection for precision hole diameter verification. Class ZZ designates a commercial-grade tolerance class suited for production inspection, incoming quality control, and shop-floor measurement tasks. Machinists, quality technicians, and toolroom personnel use plug pin gages like this one as a fast, repeatable alternative to inside micrometers for checking hole conformance to print tolerances.

This gage is suited for use in manufacturing, fabrication, and machine shop environments where hole diameter verification is required. It is appropriate for inspecting holes in metal, plastic, or composite workpieces where the nominal diameter is 0.252 inches. The minus designation means the gage is ground to the lower end of the tolerance band, making it appropriate for checking that a hole has not been drilled or bored undersized beyond the allowable limit.

Key Features

• Class ZZ tolerance class for commercial-grade production inspection
• Minus designation for lower-limit hole size verification
• 0.252 inches nominal diameter with 0.0002 inches tolerance
• Steel construction for durability in shop-floor conditions
• Single-piece design for fast, repeatable go/no-go checks

Compatibility

Designed for use as a plug pin gage wherever 0.252 inch nominal diameter hole inspection is required in production or quality control applications.

Installation Notes

Plug pin gages are handled and stored by quality technicians and machinists and require no installation in the traditional sense. Before use, clean the gage and the hole bore to remove chips, coolant, and debris that could affect measurement accuracy. Do not force the gage into a hole; light hand pressure is sufficient for a proper go/no-go check. Store in a protective case away from other tooling to prevent nicks or surface damage that would compromise accuracy.