Metal Scissors http://www.soundhunter.com/
Warning! (freeware) by Joemation @ http://www.flashkit.com/soundfx/Electronic/Beeps/Beeeeep-Joematio-8456/index.php
Beeeeep (freeware) by public domain @ http://www.flashkit.com/soundfx/Mechanical/Alarms/Warning-public_d-308/index.php