The common specifications for 50 sets of keel are width of 50mm, height of 19mm or 20mm, thickness of 0.5mm or 0.6mm, made of galvanized steel plate, and structural type of U-shaped or C-shaped section.
Standard specifications for 50 sets of keel
According to the latest national standard "Light Steel Keels for Buildings" (GB/T 11981-2024) and relevant authoritative data, the main specifications of 50 sets of keels are as follows:
Section size:
Width: 50mm (standard model).
Height: 19mm or 20mm (commonly C50 × 19 × 0.5 or U50 × 20 × 0.6).
Thickness: 0.5mm (minimum requirement of national standard) or 0.6mm (reinforced type).
Structure type:
U-shaped or C-shaped cross-section, used in conjunction with load-bearing keel.
Material:
Galvanized steel sheet, double-sided galvanizing amount shall comply with GB/T 11981-2024 standard.
Other common parameters
Installation spacing: 30-60 centimeters (adjusted according to load requirements). ‌‌
Length: Usually 3 or 4 meters, the market also offers customized specifications such as 3.2m and 3.5m. ‌‌
Application scenarios:
0.5mm thickness is suitable for non accessible suspended ceilings.
1.0mm and above thickness is used for suspended ceilings or special load-bearing requirements. ‌‌
Precautions
The 2024 version of the national standard has added requirements for salt spray resistance testing, and when selecting, attention should be paid to the quality of the galvanized layer. ‌‌
In actual construction, the auxiliary keel needs to be used in conjunction with the main keel (such as 60 × 27mm specification) to ensure structural stability. ‌‌