Spi 19-813-5 Class Zz Minus Plug Pin Gage 0.813 in

Product Description

The SPI 19-813-5 is a Class ZZ minus plug pin gage with a nominal diameter of 0.813 inches, designed for go/no-go inspection of bored holes, drilled passages, and machined features in production and toolroom environments. Built from steel, it holds a tolerance of 0.0002 inches, meeting Class ZZ standards for general-purpose dimensional verification. Machinists, quality control technicians, and toolroom professionals use plug gages like this one to confirm that a hole falls within specified limits without requiring a measuring instrument at the point of inspection.

This gage is suited for inspection tasks in light manufacturing, job shop machining, and quality assurance workflows where hole size conformance must be verified quickly and reliably. The minus designation indicates the gage is ground to the lower boundary of the nominal size, making it appropriate for checking minimum hole acceptance criteria. It is a standard single-ended plug gage for bench or floor-level inspection use.

Key Features

• Class ZZ tolerance rating for general-purpose go/no-go hole inspection
• Minus designation ground to the lower limit of the nominal diameter
• 0.813 inches nominal diameter for common bore and hole sizes
• Steel construction for durability and dimensional stability during repeated use
• Tolerance of 0.0002 inches for reliable conformance checking
• Compact single-piece design suitable for bench inspection stations

Compatibility

Designed as a standard Class ZZ minus plug pin gage for general-purpose hole inspection in machined components requiring a 0.813-inch nominal bore diameter verification.

Installation Notes

Plug pin gages are used by quality technicians and machinists and require no installation in the conventional sense. Handle the gage with clean, dry hands or cotton gloves to prevent corrosion from skin oils, which can affect dimensional accuracy over time. Store the gage in a protective case away from abrasive tools and extreme temperature changes. Calibrate or verify the gage against a traceable master at regular intervals per your facility quality plan.