The OmniWrench 8000, more commonly just called the Wrench, is a product available from Gadgetron, and is the very first weapon Ratchet is ever seen using. Along with the Bomb Glove, it is a weapon that Ratchet starts out with for free in the original Ratchet & Clank, and it would appear again in Ratchet & Clank: Going Commando, until Ratchet replaces it with the OmniWrench 10000 on Tabora. Being the game's most basic weapon, it is the most commonly associated with Ratchet.
Gadgetron originally designed the wrench to assist users in mechanical repairs and pick up spare bolts by magnetization although it doubles as a melee weapon for Ratchet. The wrench is often used to break crates and deal with smaller enemies. When used in combat, the Wrench is capable of performing several moves such as the Comet-Strike (Which is new for the 8000 model) and the Hyper-Strike. While it can do substantial damage towards small enemies, it is generally recommended that the user refrain from using it against tougher enemies, especially during boss battles. In addition to be used in repairs and combat, the OmniWrench 8000 can be used on Bolt Cranks to open doors or release bridges.
The same, unchanged OmniWrench returns in Ratchet & Clank: Going Commando and is used by Ratchet for the entire time he could be considered a Megacorp Commando, after which he replaces the wrench with the newer OmniWrench 10000. The OmniWrench is actually the only returning weapon that the player does not have to buy from a vendor, rather, it is with Ratchet since the beginning of the game.
- While the OmniWrench 8000 is never actually seen after Going Commando, Ratchet owned several other OmniWrench models that looked similar to the 8000 model, those included the OmniWrench 10K, the OmniWrench 3000, and the ambiguously named Wrench in Ratchet & Clank: Going Mobile
- Despite having no physical appearance in Ratchet & Clank: Up Your Arsenal or Ratchet: Deadlocked, the OmniWrench 8000 is seen being used in various images in the game menu's 'Help' section. It is not known whether the 8000 Model was expected to return in those games or if it was simply a placeholder.
- In the early stages of Ratchet & Clank's production, when the game resembled a caveman-like theme, Ratchet's original melee weapon was to be Axe that would look similar in shape to the Wrench and be used to perform similar duties. When the game's futuristic/prehistoric theme was dropped, the weapon was changed. At one point, Ratchet's weapon was a club as well.
- The Wrench appears as an unlockable item in the multiplayer of Resistance: Fall of Man and Resistance 2 by achieving 40 skill points and reaching level 28 (See Mighty Wrench).