Spi 22-159-8 Class Zz Plug Gage Set 0.751-0.832 in 82 Pc

Product Description

The SPI 22-159-8 is an 82-piece Class ZZ plug gage set covering a diameter range of 0.751 to 0.832 inches with a plus tolerance of 0.0002 inches. Manufactured from steel, this set is designed for technicians and quality-control inspectors who need fast, repeatable measurement of hole sizes, slot widths, and center-to-center distances. Each pin gage in the set is calibrated to NIST-traceable standards and ships with a Certificate of Accuracy. A pin gage holder is included for organized storage and field use. The set is suited for inspection benches, machine shops, and fabrication environments where precise bore and slot verification is a routine task.

The 22-159-8 is used in GO gaging inspection workflows where verifying that a machined hole or slot falls within a specified tolerance band is required before assembly or final acceptance. The 0.751-to-0.832-inch range covers a commonly needed segment of mid-range bore sizes found in mechanical and HVAC equipment housings, valve bodies, pump casings, and structural fabrications. Professionals in manufacturing QC, mechanical contracting, and precision machining rely on Class ZZ sets for production-floor and incoming-inspection use.

Key Features

• 82-piece set spans 0.751 to 0.832 inches in Class ZZ tolerance
• Plus tolerance of 0.0002 inches per pin gage
• Steel construction for durability and dimensional stability
• NIST-traceable calibration with Certificate of Accuracy included
• Includes pin gage holder for organized storage and quick access
• Supports GO gaging, hole-size measurement, slot-width measurement, and distance-between-holes calculation

Compatibility

Designed as a standard Class ZZ plug gage set for use with any application requiring hole, slot, or bore verification in the 0.751-to-0.832-inch diameter range. Compatible with standard pin gage holders and gage block accessories used in general inspection practice.

Installation Notes

Plug gage sets are handled and used by quality-control technicians and machinists; no power tools or utilities need to be de-energized for normal gage use. Keep pins clean and lightly oiled when stored to prevent corrosion and protect calibrated surfaces. Do not drop or force pins into bores, as impact damage will affect calibration. Recalibrate the set periodically in accordance with your facility quality program and applicable metrology standards.