Do the numbers first: the Ray-Ban RB4075 takes a 130mm temple arm in molded plastic, matching a square front. This aftermarket pair is made to that spec rather than to a generic 'short Ray-Ban temple' fit, since 130mm is shorter than the 140-145mm length used on most of the wider RB4000 square-front range.

On short plastic arms like this one, the part most likely to wear out first is the screw hole at the hinge end, where repeated tightening can gradually enlarge the hole in the plastic until the screw no longer holds firm. A loose hinge is usually this, not a sign the whole arm has failed sooner than expected. If the hole is stripped or the arm is cracked at that point, swapping the arm is the straightforward fix.

Frequently asked questions

What material are the arms made from, and will the color match my frame?

The arms are molded in an acetate or metal finish that matches the Square style of the 4075 closely, though very slight shade variation is possible since they're independently produced as separate aftermarket parts rather than cut from the same batch as the frame.

Can I replace just one arm, or do I have to buy both?

You can order a single side if only one arm on your 4075 is broken or scratched, or buy the pair if both need replacing — either way they match the 130mm length exactly.

How do I know these arms will fit my Ray-Ban frame?

These arms are made specifically for the 4075, matching its 130mm length and Square hinge design, so they attach to your existing screws and hinge without any filing or adjustment needed.

Are these official Ray-Ban replacement parts?

These are compatible aftermarket arms, independently produced to match the 4075's hinge and 130mm length. They aren't manufactured or supplied by Ray-Ban, just built to the same measurements so they attach correctly.