Spi 19-786-3 Class Zz Minus Plug Pin Gage 0.786 in

Product Description

The SPI 19-786-3 is a Class ZZ minus plug pin gage designed for go/no-go dimensional inspection of machined holes and bores. It measures 0.786 inches in diameter and is manufactured from steel for durability in shop-floor environments. The minus tolerance configuration means the gage is ground undersized from nominal, conforming to Class ZZ standards for plain plug gages. Machinists, quality control technicians, and tool-room professionals use this gage to verify hole diameter acceptance during production inspection.

This plug pin gage is suited for use in manufacturing, machining, and inspection environments where dimensional verification of drilled, reamed, or bored holes is required. It is appropriate for both production-line inspection and tool-room verification tasks. The 0.786-inch diameter targets applications where that specific nominal hole size must be confirmed within tolerance. This gage is a single-end minus member and is typically used as the go member in a paired inspection setup.

Key Features

• Class ZZ minus tolerance ground to 0.000200 inches for standardized go/no-go inspection
• 0.786-inch nominal diameter for precise hole verification
• Steel construction provides wear resistance for repeated shop use
• Single-piece plug gage format for straightforward hand-held inspection
• Lightweight at 0.2 pounds for easy bench or in-process use

Compatibility

Designed as an OEM-style replacement and standard inspection tool for use in any application requiring Class ZZ minus plug gage verification at a 0.786-inch nominal hole diameter.

Installation Notes

Plug pin gages require no installation but should be handled and stored according to standard metrology practices to preserve accuracy. Always clean the gage and workpiece bore before use to prevent debris from affecting the measurement reading. Do not force the gage into a bore; if resistance is felt, the hole is undersized and should be returned for rework. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity over time.