Spi 29-169-0 Class Zz Plus Plug Gage 0.169 in Steel

Product Description

The SPI 29-169-0 is a Class ZZ Plus plug gage designed to verify hole diameters to a nominal size of 0.169 inches with a tolerance of 0.0002 inches. Machined from steel, this go/no-go style inspection tool provides reliable dimensional verification for precision bore and hole checks in manufacturing, machining, and quality-control environments. Class ZZ Plus gages are used where tight dimensional repeatability is required. Machinists, quality technicians, and tool-and-die professionals rely on plug gages like this one to confirm that drilled, reamed, or punched holes fall within specified tolerances before parts move to the next stage of production.

The 29-169-0 is suited for inspection of small-diameter holes in metal, plastic, or composite workpieces. It is commonly used on the shop floor and in inspection rooms where go/no-go verification is part of standard process control. The compact form factor makes it practical for in-line checks at machining centers or manual inspection benches. This gage is appropriate for both production-run sampling and individual part verification in low-to-high volume shops.

Key Features

• Class ZZ Plus tolerance grade for dimensional accuracy to 0.0002 inches
• Nominal measurement diameter of 0.169 inches
• Steel construction for durability and wear resistance in shop environments
• Compact single-unit form factor for easy handling during inspection
• Go/no-go verification method supports fast, repeatable process control

Compatibility

Designed as an OEM-style replacement or standard plug gage for use in any inspection application requiring verification of a 0.169-inch nominal hole diameter to Class ZZ Plus tolerance standards.

Installation Notes

Plug gages are used by quality technicians and machinists and require no installation in the traditional sense, but proper handling is essential for accurate results. Store the gage in a protective case and allow it to thermally stabilize to room temperature before use, as temperature variation can affect readings at tight tolerances. Never force the gage into a hole; light hand pressure is sufficient for a valid go/no-go check. Calibrate or verify the gage against a known standard at regular intervals per your facility quality plan.