Spi 29-245-8 Class Zz Plus Plug Gage 0.245 in

Product Description

The SPI 29-245-8 is a Class ZZ Plus plug gage used to verify the inside diameter of bored, reamed, or drilled holes to a nominal size of 0.245 inches. It holds a tolerance of 0.0002 inches, placing it in the ZZ Plus accuracy class for go/no-go inspection work. The gage is manufactured from steel for wear resistance and dimensional stability under repeated use. Machinists, quality control technicians, and toolroom personnel use this type of instrument to confirm that machined holes meet drawing tolerances before parts move to the next stage of production.

This plug gage is suited for shop-floor and inspection-room use in manufacturing environments where hole diameter verification is part of standard quality assurance. It is appropriate for checking production parts in metalworking, fabrication, and precision machining operations. The 0.245-inch diameter covers a common range used in close-tolerance bore inspection. The compact size and light weight of 0.2 pounds make it easy to handle during high-volume inspection tasks.

Key Features

• Nominal measurement diameter of 0.245 inches for precise bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for accurate go/no-go gauging
• Steel construction provides durability and dimensional stability
• Lightweight at 0.2 pounds for comfortable repeated use
• Single-piece package quantity ready for immediate deployment

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for inspection setups requiring a 0.245-inch nominal diameter Class ZZ Plus instrument in steel.

Installation Notes

Plug gages are used by quality technicians and machinists and require no installation in the traditional sense, but proper handling practices apply. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Do not force the gage into a hole; entry should be smooth and without lateral pressure to avoid wear or damage to the gage or the part being inspected. Store in a protective case away from temperature extremes to preserve calibration integrity.