Window Mullions & Clips

Searching for premium aluminum extrusions for window and door manufacturing? LT Metal Supply offers a complete range of high-performance mullions designed to exceed industry expectations. Our versatile mull systems are compatible with all Approved Fenestration Products and currently offer impact approval for regions outside the High Velocity Hurricane Zone (HVHZ), with HVHZ certification underway.

Whether your project requires vertical, horizontal, or combined orientations, our tube mullions and Bay/Bow mullions—available in 22.5°, 45°, and 90° configurations—provide exceptional flexibility and structural strength. These mullions are ideal for twin setups or multi-unit configurations, giving you greater freedom to meet diverse design and engineering requirements.

Expand your design possibilities with LT Metal Supply’s precision-engineered mullions—built for performance, compatibility, and long-term reliability.