EVT25C-BLCSS — Black Aluminum Truss Clamp for 25mm Tubing with Wing Nut Closure

The EVT25C-BLCSS is a black-finished lightweight aluminum clamp for 25mm OD tubing, truss, and pipe — the dark-finish, wing nut closure variant in the EVT25C family for installations where tool-free hand adjustment is preferred and every visible component needs to match a dark visual standard. Built from 6061-T6 aluminum alloy with S45C carbon steel hardware, the EVT25C-BLCSS uses an M6 x 30mm bolt with flat washer, lock washer, and wing nut — a hand-tightened hardware stack that allows quick repositioning without tools while the lock washer maintains clamping force against vibration-driven loosening. The black finish absorbs light instead of reflecting it, keeping the clamp invisible in dark overhead grids, black truss runs, and architectural environments where silver hardware would stand out.

Function and Compatibility:

The EVT25C-BLCSS 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 M6 x 30mm bolt is inserted through the collar with the flat washer and lock washer stack, then the wing nut is tightened by hand. The flat washer spreads clamping load across the collar face; the lock washer resists the wing nut backing off under operational vibration. The 30mm bolt length accommodates the full hardware stack above the collar without running short. Compatible with any round tube or pipe in the 25mm outer diameter range used in exhibition structures, retail displays, theatrical rigging, and permanent architectural overhead installations where the clamp color has to disappear into the surrounding structure.

Key Features

• 25mm Tube Fit: Designed for 25mm OD tubing — the mid-range small-tube clamp between the 20mm and 35mm sizes.
• Black Finish: Dark surface absorbs light and integrates with black truss systems, dark ceilings, and stage environments where silver hardware creates an unwanted visual contrast against the surrounding structure.
• Wing Nut Closure: Hand-tightened wing nut allows tool-free installation and quick repositioning — open, seat, and lock without wrenches or hex keys.
• Complete Hardware Stack: Ships with M6 x 30mm bolt, flat washer, lock washer, and wing nut — flat washer distributes clamping load, lock washer resists loosening under vibration.
• 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 wing nut by turning it counterclockwise to release the bolt and open the collar.
2. Place the EVT25C-BLCSS on the truss, tube, or pipe and close the collar.
3. Put the bolt back in place with the washer and wing nut above the collar.
4. Make sure the EVT25C-BLCSS is located in its proper place on the truss, tube, or pipe before tightening the wing nut.
5. Turn the wing nut clockwise to tighten and secure the EVT25C-BLCSS into place.

Safety and Rigging Notice

Critical Rigging Guidelines:

• Load Rating: Do not exceed the rated load capacity of the EVT25C-BLCSS or the truss system it is installed on.
• Inspection: The EVT25C-BLCSS 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.