Spi 29-916-4 Class Zz Plus Plug Gage 0.916 in

Product Description

The SPI 29-916-4 is a Class ZZ Plus plug gage designed to verify bore and hole dimensions with consistent, repeatable accuracy. Manufactured from steel, this gage checks a nominal diameter of 0.916 inches and holds a tolerance of 0.0002 inches, meeting Class ZZ Plus precision standards. It is a go/no-go style inspection tool used in machine shops, manufacturing facilities, and precision fabrication environments. Machinists, quality control technicians, and tooling specialists rely on plug gages like this to confirm that drilled, reamed, or bored holes fall within specified dimensional limits before parts move to the next stage of production.

This plug gage is suited for inspection of through-holes and blind holes in metal components across a range of industries including automotive, aerospace, and general manufacturing. It is appropriate for both incoming inspection and in-process quality checks where a 0.916-inch nominal bore diameter must be validated. The compact form and steel construction make it durable for regular use on the shop floor or at an inspection station.

Key Features

• 0.916-inch nominal measurement diameter for precise bore verification
• Class ZZ Plus tolerance of 0.0002 inches for high-accuracy inspection
• Steel construction for durability and dimensional stability
• Compact, single-unit design suited for bench or floor inspection use
• Consistent go/no-go verification reduces measurement subjectivity

Compatibility

Designed as an OEM-style precision inspection gage for verifying 0.916-inch diameter bores in machined components across general manufacturing and quality control applications.

Installation Notes

Plug gages are handled and used by machinists or quality control technicians and do not require installation in the traditional sense. Before use, ensure the gage and the workpiece bore are clean and free of chips, coolant, or debris that could affect the reading. Store the gage in its protective case when not in use to prevent wear or damage to the precision ground surfaces. Calibration and periodic recertification against traceable standards is recommended to maintain measurement integrity.