SKYWALKER, METAL - RESOUNDING CLANG

This's a Skywalker Sound sound effect.

Movies

 * Monkeybone (2001) (used occasionally, like when Monkeybone hits Stu with a wrench)

TV Shows

 * Star Wars: The Clone Wars (Heard once in "Secret Weapons")

Audio Samples
The best source is in Monkeybone, but it was used once in the Clone Wars episode "Secret Weapons" when one of the robots runs into a pole or something.