Spi 19-259-1 Class Zz Minus Plug Pin Gage 0.259 in

Product Description

The SPI 19-259-1 is a Class ZZ minus plug pin gage designed to check hole diameters to a nominal size of 0.259 inches. Built from hardened steel, this go/no-go style gage provides a tolerance of 0.0002 inches, making it suitable for dimensional inspection tasks in machine shops, manufacturing facilities, and maintenance environments. Class ZZ is the standard grade for general-purpose inspection work, offering accurate verification without the tighter tolerances required for master or setting gages. Machinists, quality control technicians, and toolroom professionals use this gage to confirm bore sizes quickly and reliably.

This plug pin gage is used in precision measurement applications where hole diameter conformance must be verified against a defined tolerance. It is well suited for incoming inspection, in-process quality checks, and final part verification in production and job shop environments. The 0.259-inch nominal diameter covers a common bore size found in mechanical assemblies and fabricated components. The minus designation indicates the gage is manufactured to the low side of the tolerance band, consistent with Class ZZ minus specifications.

Key Features

• Class ZZ minus tolerance grade for general-purpose hole inspection
• Nominal diameter of 0.259 inches for precise bore verification
• Tolerance of 0.0002 inches for repeatable dimensional checking
• Hardened steel construction for durability and wear resistance
• Compact single-gage format suited for bench and floor inspection use

Compatibility

Designed as a general-purpose plug pin gage for use with standard gage handle sets and suitable for any application requiring inspection of a 0.259-inch nominal bore diameter.

Installation Notes

Plug pin gages are handled and used by quality control technicians and machinists and do not require installation in the traditional sense. Clean the gage and the bore being checked before use to prevent measurement error from debris or oil. Store the gage in its protective case when not in use to prevent nicks or surface damage that would affect accuracy. Calibration intervals should follow the facility quality management system and applicable metrology standards.