Hollyland Spares - Screw Fitting (for Mars 4K & Cosmo C1)

The Hollyland Screw Fitting (Model: HL-SF02) is an official OEM mounting expansion plate tailored specifically for the Mars 4K and Cosmo C1 wireless video transmission systems.

Because the Mars 4K and Cosmo C1 share a similar heavy-duty, vertical chassis design, they utilize this specialized rectangular cold-shoe expansion plate to convert their side or bottom alignment points into a fully stabilized, anti-twist rigging node.

Core Structural & Rigging Features

• Dual-Point Stabilization: The plate features two integrated, captive thumb-tightening screws positioned on either side of the center hub. These lock directly into the matching dual-thread spacing on the back or side panel of the transmitter/receiver chassis, completely eliminating the twisting or spinning common with single-screw mounts.

• Reinforced $1/4"-20$ Female Port: The center of the plate provides a deep, precision-threaded $1/4"-20$ female receiver hole. This lets you attach articulating friction arms, quick-release plates, or cold shoe adapters natively without putting stress directly on the main chassis body.

• Low-Profile Vertical Integration: Designed to maintain the sleek, aerodynamic profile of your wireless systems. When bolted to the back of a Cosmo C1 or Mars 4K, it sits perfectly flush, ensuring it doesn't block access to the SDI loopout ports, HDMI sockets, or the battery release mechanism.

• CNC Aluminum Construction: Machined out of high-grade, lightweight aluminum alloy and finished in a non-reflective matte black anodized coating to handle heavy daily on-set production abuse.

System Interoperability

This expansion accessory attaches directly to the dedicated hardware mounting channels found on:

• Hollyland Mars 4K Transmitter & Receiver Units

• Hollyland Cosmo C1 SDI/HDMI Wireless Video Systems

Technical Specifications Matrix

On-Set Rigging Tip: When utilizing this fitting to mount your transmitter vertically on a camera cage, ensure both thumbscrews are tightened completely flat against the chassis frame. This distributes the weight of attached SDI/HDMI cables evenly across the plate, preventing localized thread wear during sudden camera pans or rapid handheld movements.