Spi 29-490-0 Class Zz Plus Plug Gage 0.49 in Steel

Product Description

The SPI 29-490-0 is a Class ZZ Plus plug gage designed for precision dimensional inspection of cylindrical bores and holes. It measures 0.49 inches in diameter with a tolerance of 0.0002 inches, making it suitable for go/no-go inspection workflows where tight dimensional control is required. Constructed from steel, this gage provides consistent durability through repeated use in production and inspection environments. Machinists, quality technicians, and tool-and-die professionals use plug gages like this one to verify hole diameters quickly and reliably without specialized metrology equipment.

This plug gage is used in manufacturing, machine shops, and quality control departments for verifying bore diameters on machined parts, castings, and fabricated components. The Class ZZ Plus rating indicates it meets published tolerance standards for working gages used in production inspection. It is appropriate for both incoming inspection and in-process checks on parts with a 0.49-inch nominal bore diameter. At 0.2 pounds, it is lightweight enough for bench use or handheld inspection at the machine.

Key Features

• 0.49-inch diameter measurement for precision bore inspection
• 0.0002-inch tolerance meets Class ZZ Plus working gage standards
• Steel construction for durability and wear resistance in production use
• Lightweight at 0.2 pounds for easy handling during inspection
• Single-piece package quantity suitable for individual station or toolbox use

Compatibility

Designed as a working-class plug gage for inspecting cylindrical holes with a 0.49-inch nominal diameter in production and quality control applications.

Installation Notes

Plug gages are handheld inspection tools and do not require installation in the traditional sense. Handle with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store in a protective case or designated gage block when not in use to preserve calibration integrity. Gages should be periodically recalibrated against traceable masters in accordance with your shop quality system requirements.