Spi 19-246-8 Class Zz Minus Plug Pin Gage 0.246 in

Product Description

The SPI 19-246-8 is a Class ZZ minus plug pin gage machined to a 0.246 inch nominal diameter with a tolerance of 0.0002 inches in the minus direction. Pin gages in this class are used to verify hole diameters, slot widths, and machined bore dimensions to a known standard. Class ZZ is the general-purpose inspection grade, suited for production floor checks rather than master-level laboratory use. The steel construction provides consistent hardness and resistance to wear over repeated use. Machinists, quality control technicians, and toolroom personnel use these gages as part of go/no-go inspection routines or as individual diameter references during setup and verification work.

This gage is appropriate for dimensional inspection tasks in machine shops, manufacturing facilities, and toolrooms where hole diameter verification is required. At 0.246 inches, it fits within the fractional and decimal inch range commonly encountered in general metalworking, automotive, aerospace, and industrial maintenance applications. It is used as a standalone pin or as part of a larger pin gage set to confirm that a drilled, reamed, or bored hole falls within acceptable dimensional limits. The minus tolerance designation means the gage is ground to the low side of the nominal, which is standard for plug-type go gages.

Key Features

• Class ZZ tolerance grade — general-purpose inspection standard for production use
• Minus tolerance ground to 0.0002 inches below nominal diameter
• 0.246 inch nominal diameter for decimal inch hole verification
• Steel construction for durability and dimensional stability under repeated use
• Single-piece pin format for use standalone or in a pin gage set handle

Compatibility

Designed as a replacement or supplemental pin for standard pin gage handle sets accepting 0.246 inch diameter Class ZZ minus pins. Compatible with most commercial pin gage handles designed for this diameter range.

Installation Notes

Pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store in a protective case away from other metal tools to avoid surface damage. When inserting into a bore, apply light hand pressure only — never force the pin, as this can damage the gage or the workpiece. Periodic cleaning and light oiling with instrument-grade oil will extend service life and maintain measurement accuracy.