Spi 29-170-8 Class Zz Plus Plug Gage 0.17 in Steel

Product Description

The SPI 29-170-8 is a Class ZZ Plus plug gage designed for precision hole and bore measurement in machine shops, inspection departments, and production environments. It measures a nominal diameter of 0.17 inches with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection work where tight dimensional control is required. Constructed from steel, this plug gage delivers the durability and wear resistance expected in repetitive gauging applications. Machinists, quality control technicians, and toolroom professionals rely on this type of instrument for verifying bore conformance to print specifications.

This plug gage is used in precision machining and manufacturing environments where hole diameter verification is a routine inspection step. Class ZZ Plus is a standard tolerance class for plug gages, indicating a tighter tolerance than Class ZZ, and is appropriate for checking finished bores in both production and inspection settings. It is well suited for ferrous and non-ferrous workpieces where dimensional accuracy directly affects assembly fit and function.

Key Features

• Nominal measurement diameter of 0.17 inches for precise bore gauging
• Class ZZ Plus tolerance class at 0.0002 inches for tighter-than-standard inspection accuracy
• Steel construction provides durability and resistance to wear in production use
• Compact and lightweight at 0.2 pounds for easy one-hand handling during inspection
• Designed for go/no-go style dimensional verification of drilled or reamed holes

Compatibility

Designed as a standard plug gage for use in any inspection or machining environment requiring verification of 0.17-inch nominal bore diameters to Class ZZ Plus tolerances.

Installation Notes

Plug gages are handled and stored by metrology or quality control personnel, not installed in a system. Clean the gage and the bore being measured before use to avoid false readings caused by debris or cutting fluid residue. Store in a protective case away from moisture and temperature extremes to maintain calibration. Periodic recalibration against NIST-traceable standards is recommended per your facility quality management procedures.