The common size specifications for 50 main keels include 50 × 15 × 1.0mm, 50 × 15 × 1.2mm (DU series), as well as 50 × 15 × 1.2mm and 50 × 19 × 0.5mm for UC50 main keels. The specific specifications vary depending on the model and purpose.
Main dimensions and specifications of 50 main keels
DU series load-bearing keel (suitable for indoor ceiling frames):
DU50 × 15 × 1.0mm.
DU50 × 15 × 1.2mm.
DU50 × 12 × 1.0mm.
DU50 × 12 × 1.2mm.
The material thickness ranges from 0.8mm to 1.5mm, with a thickened galvanized layer and strong corrosion resistance. ‌‌
UC50 main keel (for suspended ceiling):
50 × 15 × 1.2mm (main keel).
50 × 19 × 0.5mm (secondary keel). ‌‌
Other common specifications:
50 × 15 × 1.5mm (C-shaped ceiling keel, marked as DC50 × 15 × 1.5 GB11981). ‌‌
50 × 40mm (L-shaped ceiling keel) or 50 × 19mm (C-shaped ceiling keel). ‌‌
Precautions for specification selection
Load bearing requirements: For upper ceiling, a keel with a thickness of ≥ 1.2mm should be selected, while for non upper ceiling, 0.5-1.0mm can be selected
Sectional shape: U-shaped and C-shaped are mainstream, with U-shaped being commonly used in early craftsmanship and C-shaped being a modern standardized design. ‌‌
Supporting use: The main keel needs to be matched with the auxiliary keel (such as 50 × 19mm) and suspension rod to form a complete ceiling system. ‌‌
Materials and Certification Standards
The material is galvanized steel plate, with a double-sided galvanizing amount of ≥ 120g/m ² (superior product), and a fire rating of A. ‌‌
Compliant with the national standard GB/T11981-2008, the length can be customized (usually 3m or 6m). ‌‌