Spi 19-237-7 Class Zz Minus Plug Pin Gage 0.237 in

Product Description

The SPI 19-237-7 is a Class ZZ minus plug pin gage designed to verify bore diameters and hole sizes in precision machining and inspection applications. With a nominal diameter of 0.237 inches and a minus tolerance of 0.0002 inches, this gage provides reliable go/no-go verification for quality control workflows. Constructed from steel, it delivers the durability and dimensional stability required for repeated use in shop-floor and inspection-room environments. Licensed machinists, toolmakers, and quality control technicians use plug pin gages like this one as part of standard dimensional inspection procedures.

This gage is suited for use in machine shops, manufacturing facilities, and inspection departments where tight hole-diameter tolerances must be confirmed. It is commonly used to verify drilled, reamed, or bored holes against engineering specifications. The Class ZZ designation indicates this is a standard-grade inspection gage appropriate for general manufacturing and incoming inspection use, rather than master or reference-grade applications.

Key Features

• 0.237 inches nominal diameter for precise bore and hole verification
• Class ZZ minus tolerance of 0.0002 inches for general inspection use
• Steel construction for dimensional stability and long service life
• Designed for go/no-go inspection workflows in production environments
• Compact, single-unit form factor suitable for direct hand use or gage handle mounting

Compatibility

Designed as an OEM-style plug pin gage for use with standard gage handle sets accommodating 0.237 inch diameter pin members, consistent with general Class ZZ inspection tooling practices.

Installation Notes

Plug pin gages are installed and used by machinists, toolmakers, or quality control inspectors and require no power or special tools. Before use, clean the gage and the hole being inspected to remove chips, oil, and debris that could affect measurement accuracy. Handle the gage carefully to avoid dropping or contact with abrasive surfaces, as damage to the gage surface will affect calibration. Periodic recalibration against a traceable standard is recommended to maintain measurement integrity.