Arch 1 x 4 (3659)

LEGO® Arch 1 x 4 is a curved structural part with four top studs, rectangular end supports, and an open underside arch, identified by MPN 3659 for accurate part matching.

LEGO® Arch 1 x 4 Shape and Structure

The part combines a straight 1 x 4 top layout with a rounded lower opening, making it useful for doorways, window frames, bridge details, decorative supports, and architectural builds.

Curved LEGO® Arch Part Details

• Four-stud top surface for layered building
• Curved underside opening for arch-shaped construction details
• Block-style end supports for stable visual structure

Browse more curved and architectural building elements in the LEGO® arch piece collection.