Hi

No. Its not enough to trigger a metal detector. Considering such small metals are found everywhere from bags to jeans it would be headache if the alarm went on at every turn I suppose the security people do consider such trivial things before setting up a metal detector. Moreover the metals in clothes aren't mentioned in the rules hence don't count it.

But make sure to follow the other rules and try to keep it minimal as far as possible to save yourself and them from unnecessary headache.

Hope this helps.