What term is used to refer to fixtures or jigs that are specifically used in assembly?

The term "assembly jigs" specifically refers to tools designed to hold and support parts during the assembly process, ensuring accurate alignment and positioning. These jigs play a crucial role in maintaining efficiency and precision within the assembly line by reducing manual handling and potential errors during the assembly of components. This designation emphasizes their purpose in the assembly of parts into a final product, distinguishing them from other types of jigs that may be used in different processes such as fabrication or production activities.

The other terms, while related, refer to different contexts or stages in manufacturing. Holding jigs may imply a broader usage not limited to assembly, production jigs can encompass tools used in manufacturing at various stages, and fabrication jigs refer more specifically to tools used in the initial creation of components rather than their assembly into final products.