From Teletraan I: The Transformers Wiki

Hardcase is a Decepticon character in the Generation 1 continuity.

Hardcase is a Decepticon who joined Starscream's Predacons after the disappearance of Optimus Prime and Megatron in a space bridge accident. He has a tendency to lose his head.

[edit] Fiction

[edit] Dreamwave Comics

Hardcase, along with Stormbringer and Pulse, were assigned by Starscream to meet two ships loaded with energon at the Moon Alpha spaceport. However, all three were slain by Grimlock and the Lightning Strike Coalition before Starscream and the energon arrived. To add insult to injury, Grimlock hurled Hardcase's severed head at Starscream. The Dark Ages, Part 1

Since Grimlock managed to pry Starscream's confirmation codes from the guards, it's likely Hardcase wasn't actually much of a hardcase.