What sizes of truss can this base plate accommodate?

The EVT12S-BP20S features elongated 148mm bolt slots, allowing it to act as a universal base. It is compatible with 12x12 inch (EVT12S), 290mm (EVT290S), and even larger 20.5x20.5 inch (EVT20S) square truss profiles.

Why are there two pipe flanges on this plate?

This plate includes dual 1.5-inch Schedule 40 pipe flanges. The center flange is for standard symmetry, while the offset flange allows you to position uprights closer to a wall or drape line, maximizing floor space.

Does this plate have carrying handles?

Yes, it features a laser-cut carrying handle cutout for easy transport. At 51 lbs, it can typically be moved by a single person, though proper lifting techniques or gloves are recommended.

20 x 20 Inch Heavy-Duty Steel Base Plate – 9mm Thick with Dual 1.5 Inch Schedule 40 Welded Pipe Flanges for Truss and Pipe Mounting Systems

Heavy-Duty Truss and Pipe Ground Support

20 x 20 Inch Steel Truss Base Plate.
For 290 mm, 12 in, 20.5 in Truss and 1.5 in Schedule 40 Pipe.

The EVT12S-BP20S is a heavy-duty 20 x 20 inch steel truss base plate for compatible 290 mm, 12 in, and 20.5 in truss systems, plus 1.5 in Schedule 40 pipe. Built from 9 mm Q235 carbon steel and weighing 51 lb, it combines elongated truss bolt slots with centered and offset welded pipe-flange positions for flexible ground-level mounting layouts. The plate does not by itself establish that a vertical structure is stable, adequately ballasted, wind-rated, or approved for a specific height or load.

Base Plate Facts

Model / SKUEVT12S-BP20S

Product ClassHeavy-Duty Steel Base Plate

Plate Dimensions20 x 20 in / 508 x 508 mm

Plate Thickness0.35 in / 9 mm

MaterialQ235 Carbon Steel

Plate Weight51 lb / 23.13 kg

20 x 20 inSteel Plate Footprint

9 mmPlate Thickness

51 lbDocumented Plate Weight

2 Flanges1.5 in Schedule 40 Pipe

290 / 12 / 20.5Specified Truss Interfaces

What It Is

A 20 x 20 Inch Steel Truss Base Plate for Ground-Level Truss and Pipe Interfaces.

EVT12S-BP20S is a ground-level mounting component, not an independently complete support system. It provides a Q235 steel plate with slot-based truss mounting options and two welded Schedule 40 pipe-flange positions. The correct connection, ballast, anchors, upright, load, terrain, and operating conditions must be determined for the actual installation.

20 x 20 Inch Steel Plate

A 20 x 20 in / 508 x 508 mm Q235 carbon-steel ground plate for heavy-duty truss and pipe mounting applications.

9 mm Plate Thickness

The documented plate thickness is 0.35 in / 9 mm.

51 lb Plate Mass

The plate weighs 51 lb / 23.13 kg. This mass contributes to the complete system but is not a universal ballast calculation.

Matte Black Finish

The matte black powder coat supports finish continuity in black-truss, studio, stage, exhibit, and architectural environments.

Mounting Interfaces

One Steel Plate with Truss Slots and Two Pipe-Flange Positions.

The product source identifies elongated bolt slots for multiple truss bolt patterns and dual 1.5 in Schedule 40 welded pipe flanges: one centered and one offset. Each interface serves a different layout condition. Select only one mounting approach at a time unless the complete arrangement has been specifically designed and approved.

Elongated Truss Bolt Slots

The slot pattern is intended to accommodate specified 12 in, 20.5 in, and 290 mm truss bolt-pattern interfaces when physical alignment is verified.

Centered Pipe Flange

The centered welded 1.5 in Schedule 40 flange provides a symmetric pipe-upright position.

Offset Pipe Flange

The offset welded 1.5 in Schedule 40 flange provides an alternate upright position for layouts that need the pipe closer to a wall, drape line, or planned boundary.

Carrying Handle Cutout

A laser-cut handle opening is integrated into the plate for handling and placement. Use safe lifting practices for the 51 lb component.

When to Select It

Choose It When the Build Needs A Heavy Steel Plate with Multiple Mounting Paths.

Select EVT12S-BP20S when the approved design calls for a 20 x 20 inch steel truss base plate that can connect to a compatible 12 in, 20.5 in, or 290 mm truss interface, or to a 1.5 in Schedule 40 pipe upright. Selection must be based on the complete stability and connection design, not on the plate’s mass or slot pattern alone.

Vertical Truss Columns

For approved vertical truss assemblies using a compatible bolt pattern and complete stability design.

Pipe Uprights

For 1.5 in Schedule 40 pipe uprights when the centered or offset flange position fits the approved layout.

Exhibit and Scenic Bases

For planned ground-level supports in exhibits, displays, scenic work, retail environments, studios, and temporary technical installations.

Heavy Steel Alternative

For applications that call for a 51 lb steel ground plate rather than a lightweight aluminum base plate, subject to the complete project design.

Compatibility

Specified for EVT12S, EVT20S, EVT290S, and 1.5 Inch Schedule 40 Pipe Interfaces.

The product source identifies compatibility with EVT12S and other standard 12 in end-plate bolt truss systems, EVT20S and other standard 20.5 in bolt truss systems, EVT290S 290 mm square conical truss, and standard 1.5 in Schedule 40 pipe. These are interface categories, not automatic approval of every component combination. Verify actual bolt-slot alignment, hardware, flange fit, upright orientation, load path, and engineering data before installation.

EVT12S and 12 Inch Bolt Truss

Use the elongated slot pattern only after confirming the specific end-plate bolt pattern, bolt size, hardware, and required connection method.

EVT20S and 20.5 Inch Bolt Truss

Use the elongated slot pattern only after confirming the specific 20.5 in end-plate interface, hardware, and complete support arrangement.

EVT290S and 290 mm Truss

Verify the intended 290 mm truss mounting interface, receiver or bolt arrangement, hardware, and engineering data before connection.

1.5 Inch Schedule 40 Pipe

The plate includes centered and offset 1.5 in Schedule 40 pipe flanges. Verify pipe OD, insertion, upright condition, retention, and the complete load case.

Specifications

EVT12S-BP20S Product Reference.

Identity

Product Record

Model / SKUEVT12S-BP20S

BrandEvolve Truss

Product TypeHeavy-Duty Steel Base Floor Plate

Warranty1-Year Limited Manufacturing-Defect Warranty

Plate Geometry

Dimensions and Weight

Plate Dimensions20 x 20 in / 508 x 508 mm

Plate Thickness0.35 in / 9 mm

Documented Height1.38 in

Weight51 lb / 23.13 kg

Construction

Material and Features

MaterialQ235 Carbon Steel

FinishMatte Black Powder Coat

Pipe Flanges2 Welded 1.5 in Schedule 40 Flanges

Flange Positions1 Centered and 1 Offset

HandleLaser-Cut Carrying Handle Cutout

Mounting Interfaces

Documented Compatibility

Bolt-Slot Pattern4 Elongated 18 x 148 mm Slots and 1 Vertical 18 x 97 mm Slot

CompatibilityStandard 12-Inch, 20.5-Inch End-Plated Truss Systems and 290mm/F34 Square Truss Systems

Specified Pipe1.5 in Schedule 40 Pipe

Connection HardwareUniversal Bolt-Coupler Mount Hardware Included

Installation Checks

Start with the Floor. Then Verify the Connection and the Complete Stability Plan.

A truss base plate is only one element of a vertical structure. Installation requires a level and appropriate bearing surface, a verified mounting interface, correct hardware, plumb upright alignment, controlled loads, and any additional ballast or anchoring required by the complete design. The following checks do not replace a project-specific engineering review.

01 — Verify the Surface

Confirm the floor or support surface is level, stable, and appropriate for the complete plate and structure load.

02 — Inspect the Plate

Inspect the plate, welded flanges, bolt slots, handle opening, finish, and supplied connection hardware for damage, deformation, cracks, or defects.

03 — Select One Approved Interface

Use the intended truss bolt pattern or one of the pipe flanges according to the approved layout. Do not improvise a connection arrangement.

04 — Verify Hardware and Engagement

Confirm bolt size, slot engagement, flange fit, retention method, and all fasteners for the specific truss or pipe component being installed.

05 — Check Plumb and Load Distribution

Set the vertical member plumb and confirm that applied loads are distributed as required by the approved design.

06 — Add Required Stability Measures

Install specified ballast, anchors, guying, bracing, barriers, or other measures required by the complete structural and site plan.

Stability and Safety

51 Pounds of Steel Is a Product Fact. It Is Not a Universal Stability Calculation.

The base plate’s documented mass is 51 lb / 23.13 kg. Whether that mass is sufficient depends on the height and weight of the upright structure, center of gravity, applied and eccentric loads, wind exposure, floor condition, footprint, public access, impact risk, anchoring, ballast, bracing, and local requirements. Do not treat the plate as self-ballasting for every tower, totem, pipe upright, outdoor installation, or moving load condition.

A qualified professional must determine whether the base plate, ballast, anchoring, bracing, and support arrangement are adequate for the specific structure and site.

Additional ballast or other stabilization may be required for tall vertical builds, lateral loads, outdoor exposure, wind, uneven surfaces, public areas, or other site conditions.

Keep the vertical truss or pipe plumb and maintain the load distribution required by the approved design.

Do not use a damaged, bent, cracked, corroded, or otherwise compromised plate, flange, bolt slot, truss connection, pipe, or fastener.

Fully engage and secure all bolts, couplers, pins, cotter pins, or other required retaining hardware for the actual interface.

Use barriers, covers, markings, or other risk controls where the ground plate presents a trip, impact, or public-access hazard.

Steel Truss Base Plate Questions

EVT12S-BP20S Frequently Asked Questions.

What truss systems can mount to the EVT12S-BP20S?

The product source identifies EVT12S and other standard 12 in end-plate bolt truss, EVT20S and other standard 20.5 in bolt truss, and EVT290S 290 mm square conical truss. Verify the actual bolt pattern, slot alignment, connection hardware, and complete structural design before installation.

Why are there two pipe flanges?

The plate has two welded 1.5 in Schedule 40 pipe flanges: one centered and one offset. The centered flange supports a symmetric upright position; the offset flange provides an alternate position for a planned wall, drape, or boundary condition.

Does the 51 lb plate eliminate the need for ballast?

No. The 51 lb plate mass is a documented product fact, not a universal stability rating. Additional ballast, anchoring, bracing, or other stabilization may be required based on the complete structure, load, height, wind, surface, and site conditions.

Can the plate be used outdoors?

Outdoor use requires a project-specific evaluation of wind, anchoring, ballast, terrain, weather exposure, structure height, applied loads, and local requirements. The supplied product information does not establish a universal outdoor configuration.

Planning a 20 x 20 Inch Steel Truss Base Plate?

Contact us for interface confirmation, bolt-pattern review, pipe-flange questions, ballast and anchoring coordination, hardware planning, CAD resources, and project-specific technical support.

Structural Solutions, Unmatched Innovation

EVT12S-BP20S

EVT12S-BP20S | 20x20 Steel Base Plate – Universal Heavy-Duty Black Truss Base

20 x 20 Inch Steel Truss Base Plate.For 290 mm, 12 in, 20.5 in Truss and 1.5 in Schedule 40 Pipe.