The Simpson Strong-Tie ECCLL666 L-Shape End Column Cap is a structural wood connector designed for end-of-beam applications where two beams intersect in an L shape on top of a column. This is a column cap designed for wood-to-wood post and beam connections. Model Number: ECCLL666. If you are framing a layout with a 6x main beam, 6x side beam, and 6x post, this cap gives you a dedicated way to tie that joint together with the proper geometry already built in.

What makes this connector matter is that it is not a generic cap. The ECCLL666 is specifically configured for a left-direction, L-shape end condition. On jobs where a beam dies into the top of a post and a second beam intersects from the side, the connector layout has to match the framing plan. Getting that right saves rework and helps keep the connection in line with the engineer's details. Simpson Strong-Tie also calls out bolt spacing that meets NDS code requirements, which is the kind of detail that matters when the connection has to perform, not just look finished.

The body is steel with a 7-gauge thickness listed for this size, and the connector uses certified welds for strength and loading confidence. That is a big deal on a post cap like this because the weld quality is part of what makes the assembled connector act like one unit under load. Simpson also adds diamond holes for temporary fastening, which sounds like a small feature until you are trying to hold parts in place during layout and install. It gives the crew a little help before the permanent fasteners go in.

From a practical jobsite standpoint, this connector is meant for real structural framing work, not finish carpentry. It is used in wood construction where you need a strong beam-to-post connection and a cleaner way to handle intersecting members at the top of a column. The gray paint finish provides the standard Simpson Strong-Tie finish for this model, and the product is also noted by Simpson as being available in hot-dip galvanized versions depending on corrosion needs. For the listed ECCLL666, the finish provided in the supplied data is Simpson Strong-Tie gray paint.

Installation details are straightforward but important. Simpson specifies using all required fasteners and notes that bolt holes should be a minimum of 1/32 inch and a maximum of 1/16 inch larger than bolt diameter per the cited NDS guidance. Lowes also lists this model for installation with 5/8 inch diameter bolts. That gives buyers a clear picture of the hardware scale involved and reinforces that this is a substantial connector for serious timber and heavy framing connections.

The Simpson Strong-Tie ECCLL666 L-Shape End Column Cap is best suited for builders, framers, deck crews, and contractors working on post-and-beam structures, covered outdoor structures, and other wood framing assemblies where an L-shaped beam intersection lands on a 6x post. If your plan calls for a left-hand configuration, this connector is the right kind of specialized part to order up front. If the layout is mirrored, you need the right-hand version instead of trying to make this one fit.

Simpson Strong-Tie ECCLL666 L-Shape End Column Cap for Planned Structural Work

If your framing plan calls for a left-hand L-shaped beam connection on a 6x post, this is exactly the kind of connector you want to buy once and install once.

• Who it's for: Builders and framing crews handling structural wood connections with 6x beams and posts.
• Why it stands out: It is purpose-built for this exact connection style, with certified welds, 7-gauge steel, and code-minded bolt spacing.
• Worth knowing: Orientation is not optional here. This is the skewed-left version, so confirm the layout before you place the order.

• What is the Simpson Strong-Tie ECCLL666 used for? It is used for end-of-beam applications where two wood beams intersect in an L shape on top of a wood column or post.
• What member sizes does it fit? The supplied product data lists this model for a 6x main beam, 6x side beam, and 6x post.
• Is this the left or right version? This is the left-direction, skewed-left version. Simpson notes that ECCLR is the right-direction option.
• What size bolts does it use? Lowes lists installation with 5/8 inch diameter bolts.