Spi 19-525-5 Class Zz Minus Plug Pin Gage 0.525 in

Product Description

The SPI 19-525-5 is a Class ZZ minus plug pin gage with a 0.525-inch diameter, manufactured from steel for durability and dimensional stability. Plug pin gages in the ZZ class are the standard go/no-go precision tools used to verify bore and hole diameters in machined parts and assemblies. The minus tolerance designation means the gage is ground to the lower end of the allowable tolerance band, with a tolerance of 0.0002 inches. This gage weighs 0.2 pounds and is suited for quality control, inspection, and toolroom applications where accurate hole verification is required.

Class ZZ plug gages are used primarily in production and inspection environments to check hole size conformance in metal, plastic, and composite workpieces. The 0.525-inch diameter makes this gage suitable for checking mid-range bored holes and drilled passages. Typical users include machinists, quality assurance inspectors, and toolroom technicians working in manufacturing, job shop, and industrial maintenance settings.

Key Features

• Class ZZ minus tolerance designation for inspection and production-grade gauging
• 0.525-inch diameter for precise bore and hole verification
• 0.0002-inch tolerance for repeatable dimensional accuracy
• Steel construction for wear resistance and long service life
• Lightweight at 0.2 pounds for easy single-hand use during inspection

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use in go/no-go inspection of 0.525-inch diameter holes and bores in machined components.

Installation Notes

Plug pin gages are used by quality inspectors and machinists and require no permanent installation. Before use, clean both the gage and the workpiece bore to remove chips, oils, or debris that could affect measurement accuracy. Do not force the gage into a hole; if resistance is felt, the bore is undersized or contaminated. Store the gage in a protective case away from moisture and temperature extremes to maintain calibration integrity.