Camera Plate Screw Sizes: 1/4-20 vs 3/8-16
What size screws are camera plates?
Most camera plates (including quick-release plates and L-bracket plates) use a standard 1/4″-20 UNC screw to mount to the camera’s tripod socket. That thread size is the long-standing industry default for still cameras, mirrorless bodies, and many compact video rigs. If a plate ships with a single mounting screw and it fits the camera’s base without an adapter, it’s almost always 1/4″-20.
Some larger camera bodies, cinema rigs, and tripod heads also use 3/8″-16 threads, but that size is more common on the tripod/head side than directly on the camera body. Many plates, clamps, and heads include a 3/8″-to-1/4″ reducer bushing so accessories can work together without forcing a mismatch.
How to confirm your camera plate screw size
If you’re unsure what you have, check these quick indicators:
- Look at the camera’s tripod socket: Most cameras have a 1/4″-20 female socket. If it’s noticeably larger, it may be 3/8″-16 (less common on camera bodies).
- Check the plate packaging or engraving: Many Arca-style plates and L-brackets list “1/4-20” near the screw or in the specs.
- Measure the screw diameter: A 1/4″ screw is about 6.35 mm wide; a 3/8″ screw is about 9.53 mm wide.
Why the screw size matters for plates and L-brackets
The correct thread ensures the plate seats flush, stays tight, and doesn’t damage the camera’s tripod socket. It also affects compatibility with quick-release systems and accessories like anti-twist flanges or safety stops. For a deeper look at plate styles and how L-brackets and quick-release plates support vertical shooting, see this guide to L-brackets and quick-release plates.
FAQ
Do Arca-Swiss plates use 1/4-20?
Most Arca-Swiss style camera plates mount to the camera with a 1/4″-20 screw. The Arca-Swiss “standard” mainly refers to the dovetail shape, not the screw thread, but 1/4″-20 is the typical camera-side mounting thread.
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