Spi 29-957-8 Class Zz Plus Plug Gage 0.957 in

Product Description

The SPI 29-957-8 is a Class ZZ Plus plug gage used to verify bore diameters to a high level of accuracy in machining, manufacturing, and quality control environments. It measures a nominal diameter of 0.957 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where tight dimensional control is required. The gage is constructed from steel for durability and resistance to wear during repeated use. Machinists, tooling technicians, and quality assurance personnel use this type of gage to confirm that drilled, reamed, or bored holes meet specified tolerances before parts move to the next stage of production.

This plug gage is designed for use in industrial inspection settings, including job shops, production facilities, and toolrooms. It is appropriate for checking through-holes and blind bores in metal, plastic, and composite workpieces. Class ZZ Plus gages are commonly used for inspection of general-purpose holes where commercial-grade accuracy is required. The single-end design at this diameter range suits benchtop and in-process inspection workflows.

Key Features

• 0.957-inch nominal diameter for precise bore verification
• 0.0002-inch tolerance meets Class ZZ Plus accuracy standards
• Steel construction provides wear resistance and dimensional stability
• Suitable for go/no-go inspection in production and toolroom environments
• Compact and lightweight at 0.2 pounds for easy handheld use

Compatibility

Designed as a direct-use inspection gage for bores nominally sized at 0.957 inches in diameter, compatible with standard plug gage handles and holders sized for this diameter range.

Installation Notes

Plug gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store the gage in its protective case when not in use to maintain calibration integrity. Do not force the gage into a bore; resistance indicates the hole is undersize and should be returned for rework. Periodic recalibration by a certified metrology lab is recommended per your facility quality plan.