What is the collective nouns of clamp?

There isn't a widely accepted collective noun specifically for clamps. However, you could use some descriptive terms depending on the context:

General:

* Set of clamps

* Collection of clamps

* Assortment of clamps

Specific types:

* A vise of clamps (for clamps used in a vise)

* A grip of clamps (for clamps used to hold things tightly)

* A battery of clamps (for clamps used in a specific task or project)

Ultimately, the best collective noun depends on the specific situation and the type of clamps being discussed.