Reversable Plug Gages

Reversible Plug Gages

Reversible plug gages are designed for checking hole diameters or threads with a focus on extending tool life through a flippable member. The gage pin (or member) is double-ended, allowing users to reverse it when one side wears out, effectively providing two gages in one. This makes them ideal for high-volume inspection applications. They are available in tolerances like Class XX, X, Y, Z, or ZZ, and materials such as tool steel, chrome-plated steel, or carbide for enhanced durability. Features often include Go/No-Go markings, depth notches for measuring hole depths, and pressure relief flats for blind holes.

Handles for reversible gages are lightweight aluminum (often light blue for inch or yellow for metric) and come in single-end or double-end configurations. They use a quick-acting thumbscrew for secure gripping without tools, along with collets or bushings to hold the gage member. Assembly components typically include: 1 handle, 2 caps (green for Go, red for No-Go), 2 bushings, and 2 pins (one Go/plus tolerance, one No-Go/minus tolerance). Bushings are sized based on the pin diameter and sold separately for replacements. Size ranges are generally smaller, from 0.0040" to 1.0100" (0.101mm to 25.654mm), with longer versions up to 12" available in some classes.