Spi 29-630-1 Class Zz Plus Plug Gage 0.63 Inch

Product Description

The SPI 29-630-1 is a Class ZZ Plus plug gage designed for checking hole diameters in precision machining and inspection work. Built to a nominal diameter of 0.63 inches with a tolerance of 0.0002 inches, this gage provides reliable go/no-go verification for tight-tolerance bore applications. Constructed from steel for dimensional stability and wear resistance, it delivers consistent results in shop-floor and inspection-room environments. Machinists, quality technicians, and tool-room professionals use plug gages like this one to confirm that drilled, reamed, or bored holes meet drawing specifications before parts advance in production.

This plug gage is suited for use in manufacturing, fabrication, and quality control settings where precise hole diameter verification is required. It applies to inspection of drilled or reamed holes in metal, plastic, and composite workpieces. Class ZZ Plus gages are commonly used for production inspection rather than master-gage or laboratory applications. The 0.63 inch nominal diameter makes it a practical choice for checking holes in that size range across a variety of machined components.

Key Features

• Nominal diameter of 0.63 inches for direct go/no-go hole inspection
• Tolerance of 0.0002 inches meets Class ZZ Plus gage accuracy standards
• Steel construction provides durability and dimensional stability under repeated use
• Compact and lightweight at 0.2 pounds for easy handling during inspection
• Single-piece package quantity suits individual technician or toolroom use

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for production inspection of 0.63 inch nominal diameter holes in machined components across general manufacturing environments.

Installation Notes

Plug gages are handled and used by quality technicians and machinists following standard metrology practices. Clean the gage and workpiece bore before inspection to prevent debris from affecting readings. Do not force the gage into an undersized hole, as this can damage the gage land and compromise calibration. Store the gage in its protective case when not in use to prevent corrosion and wear on the precision surfaces.