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👉 Check Latest PriceDescription The SB140HD Heavy Duty Steel Internal Wall Box Lintel designed specifically for loadbearing walls with a cavity depth of 140mm. This robust lintel provides exceptional strength and stability for internal block walls, ensuring a safe and reliable structure. Key Features: Superior Coating: Supergalv coating offers up to 50% more zinc protection than standard coatings. Extended Durability: Post-fabrication galvanizing ensures no surface lacks proper paint protection. Material Excellence: Made from structural grade mild steel S275JR, compliant with EN10025. Fire Rating: Offers a fire resistance rating of up to 60 minutes with a two-coat plaster finish.