Spi 29-140-1 Class Zz Plus Plug Gage 0.14 in Steel

Product Description

The SPI 29-140-1 is a Class ZZ Plus plug gage designed to verify the internal diameter of bored or reamed holes to a nominal size of 0.14 inches. Built from steel, this go/no-go style inspection tool checks whether a hole falls within the acceptable tolerance range, making it a standard item in machining, fabrication, and precision assembly shops. The 29-140-1 carries a tolerance of 0.0002 inches, placing it in the Class ZZ Plus accuracy range appropriate for general industrial inspection work. Machinists, quality control technicians, and toolroom professionals use plug gages like this one to confirm conformance without relying on calipers or micrometers alone.

This gage is suited for use in production inspection environments where hole diameter verification is required on machined components, valve bodies, fittings, and similar parts with 0.14-inch nominal bore features. It applies to light-to-medium duty inspection tasks where Class ZZ Plus tolerances satisfy the drawing requirement. The compact size and low weight of 0.2 pounds make it easy to handle at a bench or on the shop floor during incoming or in-process inspection.

Key Features

• Nominal measurement diameter of 0.14 inches for precise hole verification
• Class ZZ Plus tolerance of 0.0002 inches for general industrial inspection
• Steel construction for durability and dimensional stability during repeated use
• Lightweight at 0.2 pounds for easy one-handed bench use
• Single-piece package quantity supports individual toolroom or kit stocking

Compatibility

Designed as an OEM-style inspection tool for verifying 0.14-inch nominal internal diameters in machined or reamed holes across general industrial and fabrication applications.

Installation Notes

Plug gages are handled and used by machinists and quality control technicians following standard metrology practices. Store the gage in a protective case away from moisture and debris to preserve the ground surface finish and dimensional accuracy. Clean the gage and the bore to be inspected before use to prevent contamination from affecting the reading. Do not force the gage into an undersized hole, as this can damage the gage surface and compromise measurement integrity.