Spi 29-657-4 Class Zz Plus Plug Gage 0.657 in Dia

Product Description

The SPI 29-657-4 is a Class ZZ Plus plug gage designed to verify inside diameter dimensions to a nominal size of 0.657 inches. It holds a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work in production and quality-control environments. Machined from steel for durability, this gage is used by machinists, tool and die makers, and quality technicians to confirm bore size conformance during part inspection. Its compact form factor and consistent tolerance class make it a reliable bench tool for high-volume or precision inspection tasks.

Class ZZ Plus plug gages are typically applied in shop-floor and metrology lab settings where bore verification is required on machined components. This gage fits inspection workflows for drilled, reamed, or bored holes at the 0.657-inch nominal diameter. It is appropriate for use in manufacturing operations, job shops, and quality departments that require traceable dimensional verification of inside diameters.

Key Features

• Nominal diameter of 0.657 inches for precise inside-diameter verification
• Class ZZ Plus tolerance of 0.0002 inches provides reliable go/no-go inspection accuracy
• Steel construction for wear resistance and long service life
• Compact single-piece form factor suits bench and floor inspection use
• Standard package quantity of 1 gage per unit

Compatibility

Designed as an OEM-style inspection tool for go/no-go bore verification of machined holes at a nominal inside diameter of 0.657 inches in standard shop and metrology applications.

Installation Notes

Plug gages are handled and stored by metrology or quality technicians, not field-installed trades. Before use, clean the gage and the bore being checked to remove chips, coolant, or debris that could affect the reading. Avoid dropping or impacting the gage, as this can alter the ground surface and invalidate the tolerance class. Periodic recalibration against a traceable master is recommended to confirm continued accuracy.