Spi 19-627-9 Class Zz Minus Plug Pin Gage 0.627 in

Product Description

The SPI 19-627-9 is a Class ZZ minus plug pin gage machined from steel, used to verify bore diameters and hole sizes in precision inspection and quality control work. With a nominal diameter of 0.627 inches and a tolerance of 0.0002 inches (minus), this gage provides a reliable go/no-go reference for confirming that a hole falls within acceptable dimensional limits. The minus designation means the gage is manufactured undersize relative to nominal, consistent with Class ZZ standards for inspection-grade tooling. At 0.2 pounds, it is a compact, hand-held tool suited to bench inspection environments and light production use.

This plug pin gage is used in manufacturing, machining, and metrology applications where hole diameter verification is required. It is appropriate for inspecting drilled, reamed, or bored holes in metal, plastic, or composite workpieces. Machinists, quality control inspectors, and tool room technicians use Class ZZ plug gages for incoming inspection, in-process checking, and final part verification across light industrial and job shop settings.

Key Features

• Nominal diameter of 0.627 inches for direct hole size verification
• Class ZZ minus tolerance of 0.0002 inches, machined undersize relative to nominal
• Steel construction for durability and dimensional stability
• Compact form factor at 0.2 pounds for easy single-hand use at the inspection bench
• Single-piece package quantity suitable for individual tooling procurement

Compatibility

Designed as a standard Class ZZ minus plug pin gage for use with conventional gage handle sets and collet-style holders sized for the 0.627 inch diameter range.

Installation Notes

Plug pin gages should be handled with clean, dry hands or lint-free gloves to prevent corrosion from skin oils. Store the gage in a protective case or padded tray when not in use to avoid nicks or surface damage that could affect dimensional accuracy. Calibration against a certified reference standard is recommended before first use and at regular intervals per your quality management procedures. No power tools or cutting equipment are involved in standard gage use.