Accessories / Mounts & Stands
User Manual for SmallRig 1138B Crab-Shaped Clamp Kit
Quick guide for the SmallRig 1138B Crab-Shaped Clamp Kit. Learn how to mount, use, and maintain your clamp and magic arm, including load capacity and safety guidelines.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The SmallRig 1138B Crab-Shaped Clamp Kit is a versatile mounting solution designed for cameras, monitors, LED lights, and microphones. It features a clamp that opens up to 54mm, allowing it to attach to rods, desks, tripod legs, and stabilizer handheld rings. The kit includes a ballhead magic arm with an anti-twist structure to ensure secure mounting.
In the Box
- 1 x Crab-Shaped Clamp
- 1 x Ballhead Magic Arm
- 1 x Action Camera Mount
- 1 x Guarantee Card
Product Details
The kit is designed for stability and ease of use:
- Clamp: Opens up to 54mm and includes pads to protect the surface it is clamped to.
- Ballhead Magic Arm: Features anti-slip threads on the ball head for a firm lock.
- Anti-Twist Structure: Secures the magic arm to the clamp to prevent loosening during movement.
- Mounting Options: Includes a 1/4"-20 screw for standard equipment and an action camera mount for specific frames and cages.
Safety Guidelines
To ensure the longevity and safety of your equipment, follow these guidelines:
- Environment: Do not use the product underwater, in extreme temperatures (freezing or direct heat), corrosive environments, or excessive dust. Dry metal parts immediately if they come into contact with liquid.
- Load Capacity: Do not exceed the maximum weight capacity of 1.5kg. Overloading can lead to structural failure or drops.
- Cleaning: Clean surfaces with a dry, soft cloth. Avoid using chemicals such as alcohol or solvents.
- Structural Integrity: Do not modify the product (e.g., drilling or cutting), as this compromises its integrity.
- Malfunctions: Stop using the product immediately if you notice deformation, unusual noises, or loose components.
Specifications
- Load Capacity: 1.5kg / 3.3lb
- Dimensions: 158.0 x 92.0 x 50.0mm
- Net Weight: 420.0 ± 5.0g
- Material: Aluminum Alloy, Stainless Steel
Manufacturer information
SmallRig
Practical help
Common problems
Loose components or deformation
Stop using the product immediately and contact support.
Corrosion on metal parts
Dry metal parts immediately after any liquid contact.
Structural damage
Do not modify the product (drilling/cutting) as it compromises integrity and increases drop risks.
Before use
- Verify the object you are clamping is within the 54mm opening range.
- Ensure the total weight of your equipment does not exceed 1.5kg.
- Check that the anti-twist structure is properly engaged.
- Clean the clamp pads and surfaces with a dry, soft cloth if necessary.
- Ensure the 1/4"-20 screw or action camera mount is securely tightened.
Specs in practice
- Load Capacity
- The maximum weight the kit can safely support is 1.5kg (3.3lb).
- Clamp Opening
- The clamp can grip objects up to 54mm (2.1in) wide.
Images and diagrams
- The clamp uses a T-handle knob for adjustment and features anti-slip pads for stability.
- The magic arm connects to the clamp via an anti-twist structure to prevent rotation.
- The top of the magic arm features a 1/4"-20 screw for attaching monitors, lights, or cameras.
Model compatibility
- Compatible with DJI Ronin, FREEFLY MOVI Pro, and any 30mm rods.
- Includes action camera mount for GoPro Hero Cage 3084C & 3083C and Frame for Insta360 X3 4088B.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.