Spi 19-306-0 Class Zz Minus Plug Pin Gage 0.306 in

Product Description

The SPI 19-306-0 is a Class ZZ minus plug pin gage with a 0.306-inch nominal diameter, manufactured from steel. Plug pin gages are precision measurement tools used to verify hole diameters and tolerances on machined parts, castings, and fabricated components. The minus designation means the gage is ground to the low end of the tolerance range, making it suitable for go/no-go inspection work where tight dimensional control is required. This gage carries a tolerance of 0.000200 inches, consistent with Class ZZ specifications for inspection and quality control applications. It is used by machinists, quality technicians, and manufacturing engineers working in production and inspection environments.

This gage is suited for dimensional inspection in machine shops, manufacturing facilities, and quality control labs. It is used to verify hole sizes in metal, plastic, and composite workpieces where a 0.306-inch nominal diameter is the target dimension. Class ZZ gages are widely applied in production-level inspection rather than master or reference gage applications. The compact, single-pin format is easy to integrate into standard go/no-go inspection routines on the shop floor or at an inspection station.

Key Features

• Class ZZ minus tolerance ground to 0.000200 inches for production-level inspection accuracy
• 0.306-inch nominal diameter for precise hole verification
• Steel construction for durability in shop environments
• Single-pin format integrates easily into go/no-go inspection workflows
• Lightweight at 0.2 pounds for easy handling during inspection routines

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in production inspection of machined holes with a nominal diameter of 0.306 inches. Compatible with standard gage handle holders sized for this diameter range.

Installation Notes

Plug pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store the gage in a protective case away from other metal tools to avoid surface damage that could affect accuracy. Calibration should be verified against a known master reference at regular intervals per your facility quality plan. Do not force the gage into a hole; excessive force can damage the gage or the workpiece and will compromise inspection results.