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B2-FAB: 38MM Screw-Knob Clamp


Discover the secure and efficient B2-FAB mini-clamp by Really Right Stuff. Specially designed quick-release system for hassle-free camera mounting.

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The B2-FAB mini-clamp has one centrally located 1/4"-20 threaded socket for screwing onto a 1/4"-20 threaded post or stud. The bottom surface of the B2-FAB clamp features the male component of our patented R-mount interface for mating to equipment that has the female R-Mount rosette in the most secure manner possible. The R-mount's rosette prevents twisting at the coupling point between the two pieces of hardware over time and will help eliminate the "play" that may result from hard use of the earlier tongue-and-groove designs. For example, the B2-FAB can sercurely mount back-to-back with the B2-mAS mini clamp, as used in the RRS Mini Clamp Package

Why should you invest in a quick-release system? Because screwing your camera or lens onto a platform with standard 1/4"-20 screw is tedious and insecure. Not only is it a hassle to screw your gear onto that platform, but once installed the camera or lens is free to rotate; there's nothing to prevent it from coming loose. Why invest your money in a tripod and tripod head only to compromise your shots with an insecure connection between camera and head? Instead, adopt the Really Right Stuff quick-release system. 
The Really Right Stuff quick-release system is based on the Arca-Swiss standard and has two parts: a quick-release clamp and a quick-release plate. You always need both pieces of the system. The clamp will stay on your tripod head/accessory all the time, and the plate will stay on your camera all the time. You will need to purchase a separate quick-release plate for each camera or collared, telephoto lens that you want to mount in the quick-release clamp on your tripod head. 
Clamp jaws open and close in one of two ways: by twisting a knurled knob on our tried & true screw-knob clamps; or by flipping a single lever on our innovative, patented lever-release clamps. Traditional screw-knob clamps are tried & true and can deliver slightly greater clamping force than our Lever Release clamps. 


  • Mini-clamp with 1/4"-20 threaded socket, R-Mount Rosette, 38mm jaws.
  • Made for minimal clearance and minimal weight and compact size, the knob of the B2-FAB mini clamp bears directly against the clamp jaw and is "captive" can't be lost in the field.
  • Need a sliding clamp platform? The B2-mAS can be mounted back to back with our B2-FAB mini-clamp using a flat head screw when you need a double-sided clamp, such as our Mini Clamp Package. The tabs on the bottom of the B2-FAB allow it mount in the recessed "cross" on the bottom of the B2-mAS without twisting.


Country of Origin: USA
  • Jaw Length: 1.5" / 38mm
  • Width: 2.9" / 74mm
  • Height: 0.7" / 18mm
  • Weight: 2.4 oz / 67g

In The Box

  1. B2-FAB Clamp only, mounting hardware and tools not included
  2. QR-Code Reference Card for User Manual


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