The Simpson End Column Cap for 3-1/8" Beam Legs Omitted ECCO3 1/4 is a legless column cap from Simpson engineered for end-of-beam column-to-beam connections on top of steel members. Designed to accommodate a 3-1/8" beam width, this end cap attaches via field welding directly to steel columns and beams, giving structural contractors a reliable, code-aware solution for demanding framing applications. The seat extends beyond one side of the column to provide additional bearing surface area, helping distribute load from the beam and reinforce connection integrity where it matters most.

Key Features

• Legless end cap design - eliminates pre-attached legs so the cap can be field-welded directly to steel columns and beams, offering greater flexibility at the job site
• 3-1/8" beam width compatibility - precisely sized to properly seat and support standard 3-1/8" beams, reducing guesswork and fit issues during installation
• Extended seat beyond the column face - increases bearing surface area on one side to distribute beam load more effectively and strengthen the overall connection
• 7-gauge steel construction - provides the structural capacity and durability required for high-demand framing environments, including earthquake and wind loading applications
• Simpson Strong-Tie Gray paint finish - delivers a consistent, corrosion-resistant surface treatment suited to structural installation conditions
• Domestically produced - manufactured in the United States to consistent quality standards expected in professional structural framing

Why This Product

• Purpose-built for end-of-beam steel connections - the ECCO3 1/4 is specifically designed for column-to-beam connections at the end of a beam on top of steel members, making it the right fit for a specialized framing scenario that general-purpose caps are not configured to handle
• Field-weld flexibility with pipe and custom columns - the legless construction supports field welding to pipe or other column types, allowing the connection design to be tailored by the project engineer without being locked into a fixed leg configuration
• Supports code-compliant, load-rated applications - approved for structural framing applications requiring increased uplift resistance for earthquake or wind loading, giving contractors and engineers confidence in meeting NDS code requirements
• American-made reliability from a trusted structural brand - built in the United States by Simpson, a name recognized across the structural connector industry, this cap delivers the material quality and dimensional precision that professional framing projects demand

Specifications

• Model Number: ECCO3 1/4
• Beam Width: 3-1/8 in.
• Dimension W1: 3-1/4 in.
• Dimension L: 7-1/2 in.
• Dimension H1: 6-1/2 in.
• Material: 7-Gauge Steel
• Finish: Simpson Strong-Tie Gray Paint
• Country of Origin: United States

Approved Applications

• End-of-beam column-to-beam connections on top of steel members
• Field-welded connections to steel columns and beams
• Structural framing applications requiring increased uplift resistance for earthquake or wind loading
• Connections requiring NDS code-compliant bolt spacing
• May be ordered for field welding to pipe or other columns (weld by designer)

Installation

• Use all specified fasteners.
• Bolt holes shall be a minimum of 1/32" to a maximum of 1/16" larger than the bolt diameter (per 2018 NDS, section 12.1.3.2); bolt holes should be drilled from one side all the way through the beam to maintain hole tolerances.
• Contact engineered wood manufacturers for connections involving engineered wood products.

Options

• Contact us for Configurable Options and Special orders
• For special, custom, or rough-cut lumber sizes, provide dimensions.
• ECCO may be ordered for field welding to pipe or other columns. Weld by designer.

Note: Product

Frequently Asked Questions

What beam width is the ECCO3 1/4 designed to accommodate?

The ECCO3 1/4 is designed specifically for a 3-1/8" beam width, with a W1 dimension of 3-1/4 in. to properly seat and support the beam.

How is the ECCO3 1/4 attached to steel columns and beams?

The ECCO3 1/4 features a legless design that enables field-welded attachment directly to steel columns and beams, making it a practical choice for contractors working on structural framing applications.

What is the purpose of the extended seat on this column cap?

The seat of the ECCO3 1/4 extends beyond one side of the column, providing additional bearing surface area that helps distribute the load from the beam and reinforces the integrity of the connection at the end-of-beam location.

What material and finish is used on the ECCO3 1/4?

The ECCO3 1/4 is constructed from 7-gauge steel for heavy-duty structural performance and is finished with Simpson Strong-Tie Gray paint for added durability in demanding structural environments.