Spi 19-305-2 Class Zz Minus Plug Pin Gage 0.305 in

Product Description

The SPI 19-305-2 is a Class ZZ minus plug pin gage with a 0.305-inch nominal diameter, designed for go/no-go inspection of drilled, reamed, or machined holes in production and quality control environments. Built from steel, this pin gage holds a tolerance of 0.0002 inches, consistent with Class ZZ specifications for inspection-grade tooling. It is used to verify that a hole diameter falls within acceptable limits, helping machinists, tool-and-die workers, and quality inspectors maintain dimensional accuracy on the shop floor.

Class ZZ plug gages are the standard choice for general-purpose dimensional inspection in manufacturing and metalworking settings. The minus designation indicates that the gage is ground to the lower tolerance boundary, making it suitable for checking minimum material condition in hole inspection routines. This gage is appropriate for use in job shops, production facilities, and tool rooms where consistent hole-size verification is required.

Key Features

• 0.305-inch nominal diameter for precise hole inspection
• Class ZZ tolerance class for general-purpose inspection-grade accuracy
• Minus designation for lower-boundary tolerance verification
• 0.0002-inch tolerance ensuring repeatable measurement
• Steel construction for durability in shop environments

Compatibility

Designed as an inspection-grade plug pin gage suitable for use with standard pin gage handles and holders sized for 0.305-inch diameter pins in general manufacturing and quality control applications.

Installation Notes

Pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store in a protective case when not in use to maintain calibration integrity. Apply a light coat of rust-preventive oil if the gage will be stored for extended periods. Verification against a calibrated master is recommended prior to critical inspection use.