bound - used as bondage (whether sexual or not)

broken chain - often a broken shackle or leash, sometimes aesthetic

chain_accessory - the chain is part of some accessory, clothing, fashion, etc

chain_piercing - chains leading from a piercing, often decorative, or sometime permanent nipple chains

chain_jewelry - jewelry that uses a chain in it, jewelry style chains

chain_necklace -

chain_collar

chain_leash - a chain being used as a leash

holding_chain

may add more options depending on what tags and uses I find a lot of on this