Head: Grimlock (Age of Extinction)
All other body parts: Warpath (Combiner Wars)
Drill bit: Nightbeat (Titans Return)

Transformers #18 ("The Bridge to Nowhere!") included a number of one-shot characters who did not come from the toyline, presumably since the writers needed some Cybertronian characters to blow up. Following up on customs of Crosscut and his successor, this is Borebit from the Autobot duo of Corkscrew and Borebit, who used their alt modes (I have interpreted them as drill tanks) to dig a tunnel before getting ambushed by Decepticons.

Tech Specs:

AUTOBOT - BOREBIT

"Why go around it when you can go through it?"

BOREBIT is very straightforward. No need to find a path around an obstacle when he can just drill straight through it. Impatient, always ready to charge headlong into action. Uses self-igniting thermite pellets which burn through enemy armour. Lack of patience leads to aggravation among other Autobots, but follows orders and does his job.

Strength 5, Intelligence 5, Speed 2, Endurance 7, Rank 2, Courage 7, Firepower 4, Skill 7

Transformers Universe Profile:

BOREBIT

Allegiance: Autobots
Function: Combat Engineer

"Why go around it when you can go through it?"

Profile: Borebit is a very straightforward guy. He's honest to a fault, and prefers the direct approach to everything. He sees no reason to work around a problem when you can just push straight through it, both in the metaphorical and literal senses. If there's a wall in the way, just drill a hole through it. Patience is not his strong suit. He prefers to charge headlong into action, regardless of whether it's a battle or a structural engineering problem. His first idea is always the one he prefers.

Abilities: In his alternate mode, Borebit can drill through almost any material, given enough time. His drill cuts through any metal easily, and contains an internal hydro-cooling system to prevent overheating. In combat he uses an integral self-igniting thermite pellet launcher, which burn though enemy armour but pose a danger to any nearby allies as well, due to their tendency to splash off of the target onto nearby objects and Transformers. His vehicle mode has heavy armour plating, which makes him highly resistant to damage, but also makes him quite slow.

Weaknesses: Borebit's impulsiveness and lack of patience grates on many other Autobots, who wish he would slow down and think about what he's doing. But he does his job, and follows the order he's given, so it's more of a personality conflict that an actual problem. Borebit may want to jump into the deep end, but knows that it's not his place to override his allies.