01 · REPEATED MOVEMENT
Hinges move many times a day
Every time glasses are put on or removed, the hinge rotates.
This movement and vibration can continually affect the screw-hinge connection.
A hinge screw sees repeated rotation and small vibration, but normal use alone does not mean it must continually loosen. Clamping force, thread friction, hinge alignment and wear all matter, so rapid recurrence after tightening is a reason to inspect the joint.
02 · SCREW CONDITION
The screw itself can wear
Damaged threads or a damaged screw head may prevent secure fastening.
Using the wrong screw size can also create problems.
Diameter, pitch, length and head style must match. A nearly similar screw may engage too little thread or damage the hinge, and a worn head can make future service difficult, so correct hardware matters more than simply finding a screw that enters the hole.
03 · HINGE WEAR
Inspect the hinge hole and mating parts
If a new screw still loosens, the hinge itself may be worn or deformed.
The screw may not be the failing component. Worn hinge holes or deformed knuckles can leave play even with a new screw, so increasing tightening force is less useful than identifying where clearance originates.
04 · FRAME STRESS
A narrow frame can keep loading the hinge outward
If the frame is narrower than the face, the temples and hinges may remain under outward force.
Repeated stress can contribute to play and deformation.
A frame that is too narrow can keep temples and hinges under outward load. This does not guarantee screw loosening, but it can contribute to misalignment and changing clearances, so frame width and temple spread should be checked when the problem repeats.
05 · THREAD LOCKING
Some structures may use an appropriate secondary retention method
Professional repair uses a screw suited to the product and, when appropriate, a compatible retention method.
Strong household adhesive can make future disassembly and repair difficult.
Thread-locking products vary in strength and are not required on every hinge. If a professional repair uses one, future disassembly should still be considered; strong instant adhesive can bond the screw and hinge and make later repair much harder.
SOLUTION GUIDE
If a screw repeatedly loosens
Check the threads and screw head.
Determine whether the hinge, not only the screw, is involved.
Use the correct specification for the frame.
Look for persistent outward stress at the hinge.
Confirm stability after repair.
GLANOS LENS CHECK
A screw problem can reflect the whole frame
Check the front and overall width, not only the hinge itself.
CAUTION
Do not lock the screw with instant glue
It can make later disassembly difficult and may damage nearby parts.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
eyeglass screws · hinges · loose screw · frame repair · eyewear care