Spi 19-917-4 Class Zz Minus Plug Pin Gage 0.917 in

Product Description

The SPI 19-917-4 is a Class ZZ minus plug pin gage machined to a nominal diameter of 0.917 inches with a tolerance of 0.0002 inches. Pin gages of this class are go/no-go inspection tools used to verify hole sizes, slot widths, and bore diameters to a defined tolerance standard. Class ZZ is the most commonly used commercial grade for general shop-floor and incoming inspection work. The 19-917-4 is constructed from steel, providing the hardness and wear resistance required for repeated use in production and quality-control environments. Machinists, tool and die makers, and QC technicians are the primary users of this gage.

This pin gage is suited for dimensional inspection tasks in machine shops, fabrication facilities, and manufacturing quality departments. It is used to verify that drilled, reamed, or bored holes fall within acceptable limits before assembly. The minus designation means the gage is ground to the lower boundary of the nominal diameter, making it appropriate for checking minimum hole size acceptance in go-gage applications. It is a single-pin gage intended for bench or handheld use alongside a gage block set or pin gage set organizer.

Key Features

• Class ZZ tolerance grade for general commercial inspection use
• Minus designation ground to the lower tolerance boundary of 0.917 inches nominal diameter
• Tolerance of 0.0002 inches for reliable go/no-go dimensional verification
• Steel construction for hardness and long service life under repeated use
• Single-pin format compatible with standard pin gage handle sets

Compatibility

Designed as an OEM-style replacement or supplemental pin for standard pin gage handle sets that accept 0.917-inch diameter pins. Compatible with typical commercial pin gage handles used in shop-floor inspection setups.

Installation Notes

Pin gages are installed by hand into a compatible gage handle — no power tools or cutting fluids are required. Clean the pin and the hole being inspected before use to prevent false readings from debris or oil buildup. Store pins in a protective case or indexed organizer to prevent nicking the ground surface. Do not force a pin gage through a hole that resists entry, as this can damage the gage surface and alter its calibration.