What Is Standard Tripod Thread Size?

The tripod thread size is the most common camera mount. Tripod mounts are found on most cameras, lenses, binoculars, spotting scopes and monoculars. This standard screw is known as a 1/4-20 UNC 2A or alternatively referred to as American Standard Tread Size UNC-2A (Unified Coarse) or just 2A.

The UNC-2A designation for this screw means that it is threaded with Unified Coarse threads which measure 0.190″ pitch diameter (1/4″) x 20 TPI.

I have also seen this same thread called 1/4″-20 UNC 2B, where the “2” designates the pitch and “B” means it is a binding thread. In other words, this screw will not back out under vibration.

In addition to being found on cameras, Tripod Mounts have been used on flash brackets, bubble levels, flashlights, microphone mounts and strap attachments for decades. There are a number of industry-standard dimensions for Tripod Mounts.

If you need to attach your camera or other device to a tripod, check the mounting hole on it first. If the screw is 1/4″-20 UNC 2A, then there should be no problem finding an adapter available for almost any other tripod mount.

The UNC-2B designation also means that this screw will not back out under vibration.

It’s also very important to note that if you need to attach an adapter to convert from any 1/4″-20 UNC 2A thread to another type of tripod mount, such as 3/8″ or 5/8″, it’s very important to use a mounting screw that is at least as long as the depth of the thread being converted.

If you do not have this length, then you will be exposing some of the internal threads in your camera or other device which could damage them over time. The only exception here are Low-Profile Tripod Screws, which are designed to not extend past the bottom of a mounting hole.

In many cameras and other devices, there is usually a threaded screw that can be removed that will give you access to these internal threads. Sometimes they need to be cleaned out first if they have been exposed for a long time.

Standard Tripod Thread Sizes For Other Camera Screws

The following table has a list of common tripod thread sizes used in older cameras and other devices. It is not descriptive enough to tell you exactly what sizes are used by specific manufacturers, but it will give you an idea on some of the more common ones.

Some camera manufacturers use special screws on some of their equipment, so you will have to check what the thread size is yourself before ordering a screw. Just remember that if you need to attach an adapter to convert from any standard 1/4″-20 UNC 2A tripod thread to another type of tripod mount, such as 3/8″ or 5/8″, it’s very important to use a mounting screw that is at least as long as the depth of the thread being converted.

Also remember that you should not attach an adapter to convert from any standard 1/4″-20 UNC 2A tripod thread to a non-standard size, such as those found on certain video heads which use 3/8″ or 5/8″ tripod threads.

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