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Description The Birtley SB100HD is a heavy-duty box lintel designed specifically for internal loadbearing walls with a cavity size of 100mm. This lintel is ideal for supporting plastered internal block walls in loadbearing applications. Manufactured from high-grade mild steel, it offers exceptional structural strength while providing excellent corrosion resistance through its unique Supergalv coating process. An insulated version is available for enhanced thermal performance. Key Features : Application: Heavy-duty lintel for internal loadbearing block walls, suitable for cavity sizes of 100mm. Supergalv Coating: Hot-dip galvanized after fabrication, providing up to 50% more zinc protection for extended durability compared to other coatings. Corrosion Resistance: The post-fabrication galvanizing process eliminates the possibility of inferior paint protection, enhancing the life expectancy of the product. Fire Rating: Provides 60 minutes of fire resistance with a two-coat plaster finish. Material: Manufactured from structural grade mild steel S275JR to BS EN10025-2:2004, ensuring compliance with industry standards.