LD-449 galvanized steel frame anchor bolts are pre-assembled expansion sleeve anchors engineered for secure fixing of door frames, window frames, structural members, and heavy fixtures in concrete and solid masonry. Each anchor features a zinc-plated or galvanized carbon steel bolt integrated with a pre-assembled expanding cone and expansion sleeve, ensuring consistent component alignment and reliable expansion performance every installation. The pre-assembled design eliminates on-site component handling and ensures the expanding cone is correctly positioned relative to the sleeve, preventing installation errors that could compromise load capacity. The expansion mechanism operates as follows: as the bolt is tightened, the cone is drawn into the expansion sleeve, forcing the sleeve outward against the wall of the drilled hole and creating a uniform mechanical interlock that resists both pull-out and shear loads. This controlled expansion develops load capacity across a wider area of wall material compared to single-point expansion, distributing stress and reducing the risk of localized wall failure. Zinc-plated and galvanized carbon steel construction provides corrosion resistance suitable for indoor applications and sheltered outdoor installations, with yellow zinc and black oxide finish options available for environments with elevated corrosion risk. Head type options include hex head for high-torque installation with standard wrenches, and countersunk head for flush mounting where the fixture surface must remain smooth. Sizes range from M6x60mm for light frame fixing to M12x100mm for heavy structural applications, with drill bit sizes matched to anchor diameter for clean hole preparation. Load capacity scales with thread size, embedment depth, and wall material: M6 anchors typically support 400-800N pull-out in concrete, M8 anchors 800-1500N, M10 anchors 1500-2500N, and M12 anchors 2500-4000N. These anchors are ideal for door and window frame installation in concrete walls, structural steel framing attachment, railing and handrail mounting, machinery base anchoring, and heavy bracket fixing where high load capacity and reliable expansion are required.