Spi 19-041-3 Class Zz Minus Plug Pin Gage 0.041 in

Product Description

The SPI 19-041-3 is a Class ZZ minus plug pin gage with a 0.041-inch diameter, designed for go/no-go dimensional inspection of small bored holes, drilled passages, and precision-machined features. Constructed from steel, this gage provides consistent, repeatable measurements in production and quality-control environments. The minus tolerance designation means the gage is ground to the lower limit of the nominal diameter, following standard Class ZZ practice for checking maximum material condition. Machinists, tool-and-die makers, and quality inspectors use this type of gage to verify hole sizes quickly without specialized metrology equipment.

This pin gage is suited for inspection tasks in manufacturing, machining, and fabrication shops. It works in any setting where small-diameter hole verification is required, including checking pilot holes, tap drill sizes, and clearance bores. The 0.041-inch diameter covers a range of fine-tolerance applications where accurate hole sizing is critical to assembly fit and function. The steel construction stands up to regular shop-floor use.

Key Features

• Class ZZ minus tolerance ground to 0.000200 inches for lower-limit hole inspection
• 0.041-inch nominal diameter for small-bore and fine-feature gaging
• Steel construction for durability in production and inspection environments
• Compact, single-pin format for fast go/no-go checks without complex setup
• Consistent with standard Class ZZ gage tolerancing practices

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in general dimensional inspection of 0.041-inch diameter holes across machining, fabrication, and quality-control applications.

Installation Notes

Pin gages do not require installation in the traditional sense but should be handled and stored carefully to prevent surface damage that would affect measurement accuracy. Clean the gage and the hole being checked before use to remove chips, coolant, or debris. Never force a pin gage into a hole; light hand pressure is sufficient for a proper go/no-go check. Periodic inspection for wear or damage is recommended in high-volume inspection environments.