EVT25C-BLC — Black Aluminum Truss Clamp for 25mm Tubing

The EVT25C-BLC is a black-finished lightweight aluminum clamp for 25mm OD tubing, truss, and pipe — the dark-finish version of the EVT25C family for installations where a silver clamp on a black truss run or dark overhead structure would create a visible finish mismatch. Built from 6061-T6 aluminum alloy with S45C carbon steel hardware, the EVT25C-BLC uses a nylon-insert locknut closure that resists self-loosening under vibration without a separate spring lock washer — making it particularly suited to permanent and semi-permanent overhead installations where re-tightening between uses is not practical. The M6 flanged button-head cap screw provides a low-profile dark-finish attachment point for accessory brackets with standard M6 mounting slots.

Function and Compatibility:

The EVT25C-BLC mounts to any 25mm OD round tube or pipe through a bolt-and-collar assembly. The collar opens, seats onto the tube, and closes before the M8 nylon-insert locknut is tightened clockwise to secure the collar in place. The nylon insert grips the bolt thread and resists backing off under vibration and thermal cycling, maintaining clamping force in overhead and wall-mounted applications without regular re-torquing. The black finish on the aluminum body absorbs light rather than reflecting it — keeping the clamp visually integrated with black truss systems, dark architectural ceilings, and stage environments where exposed silver hardware creates unwanted visual contrast. Compatible with any round tube or pipe in the 25mm outer diameter range used in exhibition structures, retail displays, architectural installations, and small-diameter overhead pipe systems.

Key Features

• 25mm Tube Fit: Designed for 25mm OD tubing — the mid-range small-tube clamp for applications between the 20mm and 35mm clamp sizes.
• Black Finish: Dark surface absorbs light and integrates with black truss systems, dark architectural ceilings, and stage environments where a silver clamp would create a visible finish break.
• Nylon-Insert Locknut Closure: M8 nylon-insert locknut resists self-loosening under vibration and thermal cycling — reliable long-term clamping for permanent and semi-permanent installations without re-tightening.
• M6 Flanged Button-Head Cap Screw: Low-profile flanged button-head attachment screw at M6 x 10mm — distributes load across a wider bearing surface and maintains a compact profile at the accessory connection point.
• 6061-T6 Aluminum Body: High-strength structural aluminum — lightweight for quantity use across a full installation without adding significant load to the structure.
• S45C Carbon Steel Hardware: High-strength S45C carbon steel fasteners for reliable long-term clamping performance.

Assembly Instructions

1. Release the nylon-insert locknut by turning it counterclockwise to release the bolt and open the collar.
2. Place the EVT25C-BLC on the truss, tube, or pipe and close the collar.
3. Put the bolt back in place with the washer and nylon-insert locknut above the collar.
4. Make sure the EVT25C-BLC is located in its proper place on the truss, tube, or pipe before tightening the nylon-insert locknut.
5. Turn the nylon-insert locknut clockwise to tighten and secure the EVT25C-BLC into place.

Safety and Rigging Notice

Critical Rigging Guidelines:

• Load Rating: Do not exceed the rated load capacity of the EVT25C-BLC or the truss system it is installed on.
• Inspection: The EVT25C-BLC should be fully inspected before every use. In the occurrence of any damage or defect, the clamp should not be used.
• Secondary Safety: The use of safety cables is recommended for maximum security on all overhead applications.
• Professional Review: The purchase of this product does not authorize or approve a specific installation or use. A licensed professional engineer shall review all structures, lighting plots, or other clamp uses.

Technical Resources and Project Support

Need load tables, CAD files, or engineering documentation for this product? Contact the Evolve Truss team — we'll get you what you need.

Disclaimer and Guidance Statement: The purchase of any product shall not be construed as authorizing or approving a specific installation or usage. A licensed professional engineer shall review all structures, lighting plots, or any other product uses. While exhaustive efforts have been undertaken to ensure the precision of this information, Evolve Truss Worldwide, LLC hereby disclaims any and all liability for errors. These drawings are intended solely for the purpose of providing guidance and should not be construed as definitive representations.