The tripod thread is used to mount cameras on a tripod. For this purpose, each camera has a tripod thread on the bottom side. The tripod screw connects the camera to the tripod through a hole in the tripod head. For historical reasons the tripod thread is always a UNC coarse thread. But the thread is mechanically more stable than a metric standard thread.
Standard for tripod thread DIN 4503-1 / ISO 1222
For the production of tripod connections or screw connections for camera threads / tripod threads according to DIN 4503-1 / ISO 1222
Tripod threads are de facto standardized.
1/4″ 20 pitch UNC Unified Coarse Thread (6.35mm outer diameter 5.35mm core hole diameter)
3/8″ 16 pitch UNC Unified Coarse Thread (9.52mm outer diameter 8.25mm core hole diameter)
The thread sizes of the tripod thread
1/4″ 20 pitch UNC Unified Coarse Thread (6.35mm outer diameter 5.35mm core hole diameter) is used on viewfinder cameras, SLR cameras up to medium format cameras, quick release plates and tripod heads.
3/8″ 16 pitch UNC Unified Coarse Thread (9.52mm outer diameter 8.25mm core hole diameter) is used on most medium format cameras and virtually all large format cameras, as well as most connections between tripods and tripod heads.
In practice, however, the screws, nuts and taps for 1/4″ Withworth and 3/8″ Withworth regulation threads (BSW) can also be used.
The diameter and the pitch (distance between the threads) of both thread standards are the same here, only the flank angle differs. It is 60° for UNC threads and 55° for Withworth threads. For tripod threads this small inaccuracy can be overcome but is not necessarily recommended.
Buy 1/4″ UNC hand tap DIN 4503-1 / ISO 1222
Buy 3/8″ UNC hand tap DIN 4503-1 / ISO 1222
Buy 1/4″ UNC round dies DIN 4503-1 / ISO 1222
Buy 3/8″ UNC round dies DIN 4503-1 / ISO 1222
Tripod, tripod thread on a camera
Buy 1/4″ UNC hand tap DIN 4503-1 / ISO 1222
Buy 3/8″ UNC hand tap DIN 4503-1 / ISO 1222
Buy 1/4″ UNC round dies DIN 4503-1 / ISO 1222
Buy 3/8″ UNC round dies DIN 4503-1 / ISO 1222
