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A tap and die set is a kit of specialized tools used to repair or restore damaged screw threads on eyeglass frames. The tap is used to restore threads inside the hinge barrel, and the die is used to restore threads on the screw itself.
read more about tapdie set for eyewear frames ...This set is necessary when a frame screw channel becomes stripped, cross-threaded, or damaged. Instead of replacing the entire frame part, the optician can use the tap to cut clean, new threads inside the hinge barrel, allowing a new screw to be inserted securely.
The tap tool is inserted into the hinge barrel. As it is turned, the precision cutting surface of the tap cleans out any damaged or stripped metal, creating sharp, new threads that perfectly match the replacement screw size.
The die tool is used if the end of the screw is slightly misshapen and will not enter the barrel. The die reshapes the very end of the screw threads so that the screw can be inserted smoothly without causing cross-threading damage to the frame hinge.
Thread repair makes sure your backup frames are stable. Damaged hinge threads cause the arm to constantly loosen and wobble. Repairing the threads provides a tight, permanent connection, giving you stable, centered vision when your contacts are removed.
No, they are primarily used on metal hinges. They are not used on plastic frames that use rivets or screws embedded in the material.
No, the tools are very small and precise. Attempting to use them without expertise will likely cause severe damage to the frame hinge.
No, thread repair restores the function of the hinge barrel, which helps stabilize the frame connection and extend the life of the glasses.
If your temple arm is constantly wobbly even after tightening the screw, the "threads" inside the hinge may be stripped. An optician can use a "tap" to cut new threads and install an oversized screw, preventing you from needing to buy an entirely new frame.
The Vision Council. Standards for Ophthalmic Parts (thevisioncouncil.org). 2024.
ABDO. Practical Spectacle Repair (abdo.org.uk). 2023.
Review of Optometry. Maintenance for the Optical Lab (reviewofoptometry.com). 2024.
AOA. Your Guide to Eyewear Care (aoa.org). 2024.