Hatagane

ハタガネ

The hatagane clamp (端金 / ハタガネ) is a traditional Japanese woodworking tool, but its “history” isn’t tied to a single inventor or dated invention. Instead, it evolved gradually within Japanese craft traditions—especially fine carpentry and joinery.

In short, a hatagane clamp is a precision holding tool - perfect when your joinery already fits well and you just need to keep everything in place while glue sets.