Acyl-CoA thioesterases are a group of enzymes that catalyze the hydrolysis of acyl-CoAs to the free fatty acid and coenzyme A (CoASH), providing the potential to regulate intracellular levels of acyl-CoAs, free fatty acids and CoASH. Has an acyl-CoA thioesterase activity towards the long chain fatty acyl-CoA thioester palmitoyl-CoA (hexadecanoyl-CoA; C16:0-CoA). Displays a substrate preference for fatty acyl-CoAs with chain-lengths C12-C18