The Blacklocks were a relatively unmentioned clan of dwarves in Tolkien's writings. They presumably had black hair (hence their name) and might have had relations with other Dwarven clans. They most likely originated in the southern part of the Orocarni, being the only far eastern mountain range. The Blacklocks were among the "Houses of other Fathers" who sent troops to help Durin's Folk in the War of the Dwarves and Orcs.
The People of Middle-earth