Simpson Strong-Tie ECCLR666 L-Shape End Column Cap is a structural wood connector for end-of-beam framing where two beams meet in an L shape on top of a column. This is a column cap designed for wood-to-wood beam-to-post connections. Model Number: ECCLR666. It is built for a 6x main beam, 6x post, and 6x side beam, with the side stirrup configured in the right-hand direction.

The real value here is that this connector solves a tricky framing condition with a purpose-built part instead of piecing together multiple brackets or site-made hardware. Simpson Strong-Tie designed the ECCL series for end-of-beam applications when two beams intersect over a post, and this specific ECCLR666 version handles that layout in a right-hand configuration. If your plan calls for the side beam on the opposite side, you would need the left-hand version instead.

On the material side, the ECCLR666 is made from 7-gauge steel and uses certified welds. That is the kind of spec that matters because a column cap is only as trustworthy as the steel thickness and the weld quality holding the geometry together. Simpson Strong-Tie also calls out bolt spacing that meets NDS code requirements, which helps support proper load transfer when the connector is installed as specified.

This connector includes diamond holes for temporary fastening, which is one of those small details you appreciate once you are actually setting heavy members in place. It helps hold alignment while you work through the final bolting sequence. For installation, Simpson Strong-Tie specifies 5/8-inch-diameter bolts for this model, and the bolt holes should be sized a minimum of 1/32 inch to a maximum of 1/16 inch larger than the bolt diameter per the listed NDS guidance.

The finish on this version is Simpson Strong-Tie gray paint. For interior framing or protected conditions, that gives you the standard factory-finished connector most builders expect. The ECCL family is also available in hot-dip galvanized versions, but finish should always match the exposure conditions and plans for the job.

From a design standpoint, this is not a universal catch-all bracket. It is a geometry-specific structural cap for a known framing layout. That is a good thing. When you are tying a main beam and side beam into the top of a post, a connector made for that exact condition is usually the cleaner, safer route than trying to make a general bracket do specialized work. The defined member sizing, right-hand orientation, and beam-to-post layout are what make the ECCLR666 useful.

The Simpson Strong-Tie ECCLR666 L-Shape End Column Cap makes the most sense for carpenters, framers, post-and-beam builders, deck builders, and general contractors working from engineered plans. If you are building a structural beam intersection over a 6x post and need a right-hand L-shaped cap, this is the right kind of hardware. If your layout, exposure conditions, or handedness differ, double-check the exact model before ordering because orientation and sizing matter here.

Simpson Strong-Tie ECCLR666 L-Shape End Column Cap Gets Specific for a Reason

If your plans call for a right-hand L-shaped beam-to-post connection, this is the kind of connector you buy once and install with confidence.

• Who it's for: Framers, deck builders, and contractors handling structural wood connections with a 6x post and intersecting 6x beams.
• Why it stands out: Heavy 7-gauge steel, certified welds, code-conscious bolt spacing, and a geometry built specifically for end-of-beam L intersections.
• Worth knowing: This is a handed part. Double-check right versus left before checkout, and make sure your fastener schedule matches the plans.

• What is the ECCLR666 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 this model fit? This model is sized for a 6x main beam, 6x post, and 6x side beam.
• Is this the right-hand or left-hand version? ECCLR666 is the right-hand version. Simpson Strong-Tie identifies ECCLL as the left-hand version.
• What fasteners does it use? The listed installation requirement is 5/8-inch-diameter bolts, with bolt holes sized per the stated NDS guidance.
• What finish does this version have? This version is listed with a Simpson Strong-Tie gray paint finish.