Product Description

EVT12S-BP20S | 20×20 Inch Heavy-Duty Steel Base Plate — Matte Black Powder Coat

The EVT12S-BP20S Heavy-Duty Steel Base Plate is a 20-inch × 20-inch ground-level structural foundation machined from solid Q235 carbon steel — 51 pounds of dead weight that anchors vertical truss columns and pipe uprights before a single sandbag touches the floor. This is not a lightweight aluminum plate that depends on accessories for stability; this is a built-in ballast that’s part of the structure itself, dropping the center of gravity on every totem, tower, and vertical build from the moment the column goes up. Universal elongated bolt slots accept 12-inch plated truss, 20.5-inch plated truss, and 290mm conical truss in a single plate — one SKU for three truss standards — while dual welded 1.5-inch Schedule 40 pipe flanges turn the same base into a mount point for drape poles, banner uprights, and lighting pipes without a separate floor plate for each application. Finished in a matte black powder coat that stays invisible under studio lights and stage washes, and built with a laser-cut carrying handle so one person can move 51 pounds from truck to floor position without a second grip.

Function & Compatibility:

The EVT12S-BP20S operates as the ground anchor for any vertical build that needs real mass at its base. The top plate is 9 mm (0.35 in) thick Q235 carbon steel — a low-profile dimension that minimizes tripping hazards on crowded show floors, studio sets, and event spaces while still delivering the structural rigidity to distribute vertical loads evenly across the full 20×20-inch footprint. Four 18×148 mm elongated bolt slots and one 18×97 mm vertical bolt slot provide universal mounting flexibility: slide the bolts to align with 12-inch (EVT12S) plated truss, 20.5-inch (EVT20S) plated truss, or 290mm (EVT290S / F34) conical truss end-plate patterns — a single base plate that covers three truss standards without stocking separate plates for each system. Two welded 1.5-inch Schedule 40 pipe flanges — one center-mounted and one offset — accept standard pipe uprights directly: the center flange handles symmetrical vertical builds while the offset flange positions an upright closer to a wall or drape line, maximizing usable floor space in tight booth layouts and backstage areas. All connecting hardware ships included for immediate assembly. The matte black powder coat finish resists scratching, absorbs light under stage and studio conditions, and eliminates the reflective surface issues that raw steel or aluminum plates create in camera environments.

Key Features

• 51-Pound Built-In Ballast: Solid Q235 carbon steel construction puts 51 pounds of dead weight at the base of every vertical build — functioning as structural ballast that’s part of the plate itself, not an accessory that can be forgotten, borrowed, or left on the truck.
• Universal Multi-System Bolt Slots: Elongated slot pattern accepts 12-inch, 20.5-inch, and 290mm (F34) truss bolt configurations in a single plate — one base plate SKU for three truss standards, eliminating the need to stock separate plates for each system in a mixed inventory.
• Dual Schedule 40 Pipe Flanges: Two welded 1.5-inch Schedule 40 flanges — one center, one offset — accept standard pipe uprights for drape poles, banner stands, and lighting pipes. The offset flange positions uprights closer to walls or drape lines to maximize floor space.
• Low-Profile 9 mm Thickness: The 0.35-inch (9 mm) plate height minimizes tripping hazards in high-foot-traffic environments — convention floors, studio sets, event venues, and backstage areas where crew and guests move around the base.
• Matte Black Powder Coat Finish: Factory-applied matte black powder coat absorbs light instead of reflecting it — keeping the base invisible under studio lighting, stage washes, and UV environments where raw metal surfaces create glare or fluorescence on camera.
• Laser-Cut Carrying Handle: An integrated handle cutout allows a single person to grip and transport the 51-pound plate from truck to floor position without requiring a second set of hands or separate carrying hardware.
• Complete Hardware Kit Included: Ships with all connecting hardware for immediate bolt-up to truss or pipe — no separate fastener order required.

Who It’s For

• Lighting Totem & Vertical Column Builders — You’re standing up free-standing lighting totems in convention halls, hotel ballrooms, and corporate event spaces where fixtures, moving heads, and LED panels all sit high on a narrow vertical column that’s top-heavy by design. A lightweight aluminum plate under that column depends almost entirely on sandbags for stability — and sandbags shift, get borrowed by the crew next door, or don’t make it onto the truck. The EVT12S-BP20S puts 51 pounds of steel at the base before a single sandbag is placed, dropping the center of gravity so the totem has a stable anchor that’s part of the structure itself rather than an accessory that can walk away between load-in and show time.
• Broadcast & Film Studio Riggers — You’re building and striking truss positions on a studio floor where intense, directional lighting turns any reflective surface into a problem on camera. The matte black powder coat absorbs light instead of bouncing it, keeping the base plate invisible in wide shots and floor-level angles without gaff tape or paint. Studios also run controlled repeat setups where the same truss positions get built and struck on a regular cycle — a plate that doubles as its own ballast means fewer loose sandbags cluttering a tight studio floor between camera positions, cable runs, and talent marks.
• Mobile DJs, Photo Booth Operators & Solo Entertainers — You’re building truss totems for uplighting, moving heads, or photo booth enclosures at weddings, corporate parties, and private events — often working without a dedicated rigging crew. The integrated carrying handle lets you move the plate from truck to floor by yourself, and the dual Schedule 40 pipe flanges accept standard pipe uprights for drape poles and banner stands without needing a separate base for each application. One plate handles the truss totem at tonight’s wedding, the drape upright at Saturday’s corporate gala, and the banner pole at next week’s product launch — depending on the gig, you bolt truss or drop in pipe, and the same 51-pound base anchors all of it.
• Trade Show & Exhibit Builders — Convention centers enforce strict safety rules about base weight and structural stability on the show floor, and a lightweight aluminum plate can’t meet ballast requirements on its own. The 51-pound steel base satisfies those weight mandates before you add a single sandbag, and the universal bolt-slot design accepts 12-inch, 20.5-inch, and 290mm truss — so you carry one base plate SKU regardless of which truss standard the booth design calls for. The low 9 mm profile also keeps the plate nearly flush with the floor, minimizing tripping hazards in high-foot-traffic aisles where show management is watching for safety violations.
• Structural & Rigging Engineers — The EVT12S-BP20S is a 20×20-inch, 9 mm thick Q235 carbon steel base plate weighing 51 lbs, with universal elongated bolt slots compatible with 12-inch, 20.5-inch, and 290mm (F34) truss end-plate patterns, and dual welded 1.5-inch Schedule 40 pipe flanges (center and offset). It appears on an engineered drawing as a standard cataloged ground support component. While the plate’s mass provides meaningful base stabilization, additional ballast (sandbags or equivalent) is still required for tall vertical builds, outdoor installations subject to wind load, or any configuration where transverse forces act on the structure. All vertical builds require plumb verification and balanced load distribution across the plate. A licensed professional engineer must review all structures.

Designed by Evolve Truss, the EVT12S-BP20S is the steel base plate that turns 51 pounds of dead weight into structural stability — one plate, three truss standards, two pipe flanges, and a foundation that stays put whether the sandbags show up or not.

⚠️ Safety & Engineering Notice

❗ Critical Rigging Information:

• Stability & Additional Ballast: While the 51-pound steel mass provides meaningful base stabilization, the use of additional sandbags is still highly recommended for maximum security when building tall vertical totems, outdoor installations subject to wind load, or any configuration where transverse forces act on the structure.
• Load Distribution: Ensure your vertical truss or Schedule 40 pipe is perfectly plumb and that the load is balanced evenly across the base plate.

Important Guidelines for Safe Use:

• Thoroughly inspect the base plate, pipe flanges, bolt slots, and all connecting hardware for damage, deformation, or defects before every use.
• Ensure all coupler pins, bolts, and cotter pins are fully engaged and secured tightly to the base plate.
• Handle with care during transport to prevent chipping or scratching the powder coat finish. Surface damage does not affect structural integrity but may impact appearance.
• Assembly should only be carried out by personnel familiar with heavy-duty trussing and rigging techniques.
• The purchase of this product does not authorize or approve a specific installation or use. A licensed professional engineer must review all structures, lighting plots, or other truss uses.

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Contact us today to anchor your next vertical build with the EVT12S-BP20S Heavy-Duty Steel Base Plate.