The ML-300 Mechanical Lock (3” High standing seam) features structural performance as well as architectural aesthetics. ML-300 Panels can be factory formed and/or fabricated, for all substrates, at project locations. Utilizes concealed fasteners with a floating clip system. The floating clip system reduces the effects of thermal stresses on the panels helping to maintain a beautifully smooth, and uniform appearance, despite fluctuations in temperature.    


ML-300 Mechanical Lock Panel is a mechanically seamed, vertical leg, standing seam roof system that combines a 3-inch tall slim rib with exceptional uplift resistance. ML300 Panels are designed to withstand the most rigorous weather conditions. The ML-300 Panel is available in a 24-3/4-inch width and allows for the installation directly over purlins and bar joists.


24 GA steel.

Colors available on standard, premium and metallic.

Coverage 24.¾” 

On site or factory made.

Available in smooth, striated and stiffener ribs.

UL Construction Number: TGKX.180C, TGKX.287, TGKX.308A, TGKX.539.

Uplift resistance of prepared roof-covering materials UL 580 Class90.

Impact resistance of prepared roof-covering materials UL2218 Class 4.

Fire tests of roof coverings UL 790. Class A, B, C. External fire exposure.

TDI Texas Approved.

Product Specifications


Applications: Roof

Coverage Widths: 24.¾".

Minumum Slope: ¼:12

Panel Attachment: Standing Seam System, Low, High (floating).

Gauges: 24 (standard), 22 and 26 (optional)

Finishes: Stiffener Ribs

Coatings: Galvalume®, Durapon 70®, Ceranamel®.

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