This O-ring sizing and installation jig is designed to help quickly identify, organize, and install common O-ring sizes with accuracy and consistency. The jig features precision-spaced holes sized for the most commonly used imperial O-ring inside diameters, allowing users to easily match and handle O-rings during assembly, maintenance, or repair work.

The flat, rigid design keeps O-rings securely in place while minimizing stretching and deformation. It is ideal for use in automotive, pneumatic, hydraulic, and general mechanical applications where proper O-ring sizing is critical. The compact layout fits comfortably on a standard workbench and is sized for efficient 3D printing.

Optimized for 3D printing in PLA+, PETG, or ABS, this jig requires no supports and prints quickly while maintaining strength and dimensional accuracy. A practical and reusable shop tool, it helps improve workflow and reduces guesswork when working with O-ring seals.