This article is from the Piercing FAQ, by Anne Greenblatt with numerous contributions by others.
Strenuous bondage play using chains, restraints, and weights should
only be practiced with piercings of at least 10 gauge. The thinner the
gauge, the more easily the piercing will tear. The depth of the
piercing should also be considered; a shallow piercing is more likely
to tear or be injured.
Nipple clamps may be used with caution on pierced nipples with the
jewelry in place; the clamps should be placed parallel to the
direction of the piercings.
Padlocks
Standard luggage or hardware padlocks are made of metals which are not
appropriate for wear in piercings and which can cause an allergic
reaction. The inner workings of the locks may not be rustproof.
Wildcat Collection (UK) manufactures several stainless steel padlocks
which use a screw mechanism, not a key. Jewelry By Ponce (US)
manufactures gold and silver padlocks which use a key.
 
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