Spi 19-750-9 Class Zz Minus Plug Pin Gage 0.75 Inch

Product Description

The SPI 19-750-9 is a Class ZZ minus plug pin gage used to verify hole diameters and internal bore dimensions during inspection and quality control work. This gage measures 0.75 inches in diameter and holds a tolerance of 0.000200 inches, making it suitable for general-purpose dimensional inspection in production and maintenance environments. Machined from steel, it delivers consistent, repeatable readings when checking drilled, reamed, or bored holes. Machinists, toolmakers, quality control technicians, and maintenance professionals use plug pin gages as a fast go or no-go check to confirm that a workpiece meets dimensional specifications before assembly.

The 19-750-9 is used wherever a 0.75-inch nominal hole diameter must be verified to a tight tolerance. Typical applications include incoming inspection, in-process quality checks on machined components, and final verification before part acceptance. The minus designation means the gage is manufactured below the nominal size within the Class ZZ tolerance band, which is standard practice for plug gages used in no-go or functional inspection roles. This gage is appropriate for shop-floor use in light manufacturing, job shops, and maintenance repair operations.

Key Features

• 0.75-inch nominal diameter for direct hole verification at that size
• Class ZZ tolerance classification suitable for general-purpose inspection
• Minus designation manufactured below nominal within the Class ZZ tolerance band
• 0.000200-inch tolerance for reliable dimensional control
• Steel construction for durability in shop-floor environments

Compatibility

Designed as a general-purpose plug pin gage for dimensional inspection of 0.75-inch nominal diameter holes in machined parts and components. Confirm nominal size and tolerance requirements match the application before use.

Installation Notes

Plug pin gages are handled by machinists, toolmakers, and quality technicians and require no installation in the traditional sense. Before use, clean both the gage and the workpiece bore to remove chips, coolant, and debris that could affect the reading. Do not force the gage into a hole; apply light, consistent hand pressure only. Store the gage in its protective case and handle with clean hands or cotton gloves to prevent corrosion and wear on the precision surface.