The difference between Tripod threads and Unified threads

【英】困ったときの知恵袋詳細

Cutting TapsRoll (Forming) TapsRound DiesThread Mills Related Products Unified Threads Standard (Screw Threads, Center Holes)How to useSpecification of toolsBasic Knowledge

I found a hand tap that was marked with "TRI 1/4-20" . Can you tell me what type of threads this tap is used for? Can I use this tap to produce a 1/4-20UNC Unified thread?

The taps marked with "TRI 1/4-20" are a special tap for "internal threads for camera tripod mounts". It is not the same as a standard Unified thread and will not produce the correct thread.
For details, please refer to the explanation on the attached PDF file for details.

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