Spi 19-545-3 Class Zz Minus Plug Pin Gage 0.545 in

Product Description

The SPI 19-545-3 is a Class ZZ minus plug pin gage with a nominal diameter of 0.545 inches, manufactured from steel. It is used to verify the lower limit of a hole or bore to Class ZZ tolerance standards, which are the most commonly specified tolerance class for general inspection work in production and quality-control environments. The minus designation means the gage is ground undersized, allowing it to check the minimum acceptable hole size. With a tolerance of 0.000200 inches, this gage provides reliable go/no-go inspection capability for precision machined components.

This plug gage is suited for use in machine shops, manufacturing facilities, and quality inspection labs. It is appropriate for both production-line inspection and incoming material verification where hole size conformance must be confirmed to tight dimensional standards. The 0.545-inch diameter makes it a direct fit for inspection routines targeting bores in that nominal range.

Key Features

• Class ZZ tolerance class for general-purpose production inspection
• Minus designation for lower-limit hole verification
• 0.000200-inch tolerance for precise dimensional control
• Steel construction for durability and wear resistance
• 0.545-inch nominal diameter for targeted bore inspection

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspection setups requiring a Class ZZ minus gage at the 0.545-inch nominal diameter.

Installation Notes

Plug pin gages are handled and used by quality technicians and machinists in accordance with ASME B89.1.5 or applicable shop inspection standards. Before use, clean the gage and the bore being checked to remove chips, oil, and debris that could affect readings. Do not force the gage into a hole; apply only light hand pressure to avoid gage or workpiece damage. Store the gage in its case away from heat, humidity, and contact with other metal tools to preserve calibration integrity.