A drilling tool for use in a wellbore comprises a first collar having a first bore extending from a first send to a second end and an internal thread disposed on the bore at the second end. The drilling tool also comprises a second collar having a second bore extending from a third end to a fourth end and an external thread disposed on the third end. The third end is coupled to the second end of the first collar. A first set of components is housed within the first bore and a second set of components is housed on a sidewall of the second collar formed between the second bore and an outer surface of the second collar.