Spi 19-250-0 Class Zz Minus Plug Pin Gage 0.25 Inch

Product Description

The SPI 19-250-0 is a Class ZZ minus plug pin gage used to verify bore and hole diameters in precision machining and inspection applications. Sized at 0.25 inches in diameter, this gage is manufactured from steel and holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection routines where dimensional accuracy is critical. Class ZZ is the standard tolerance class for general-purpose inspection gages used in production and shop-floor environments. Machinists, quality control technicians, and tool-and-die professionals rely on plug gages like this one to confirm that drilled, reamed, or bored features meet print specifications.

This plug pin gage is intended for use in manufacturing, machine shops, and quality inspection departments where hole diameter verification is a routine part of the process. It is well suited for checking 0.25-inch nominal diameter features on machined components across a range of industries including aerospace, automotive, and general metalworking. The minus designation indicates the gage is ground to the lower boundary of the tolerance range, consistent with standard go-gage practice for checking minimum material condition.

Key Features

• Class ZZ tolerance class for general-purpose production inspection
• 0.25 inch nominal diameter for direct bore verification
• Tolerance of 0.0002 inches for reliable dimensional control
• Steel construction for durability in shop-floor use
• Minus designation ground to lower tolerance boundary

Compatibility

Designed as a standard go-gage style plug pin gage for use with 0.25 inch nominal diameter bores in general machining and quality inspection applications.

Installation Notes

Plug pin gages are used by quality technicians and machinists and require no permanent installation. Handle the gage with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store in a protective case away from abrasive materials when not in use. Calibrate or verify against a certified master gage at regular intervals per your facility quality plan.