50 Pack 3/8" x 5" Flat Head Sleeve Anchors, Zinc Plated Heavy Duty Expansion Bolts for Masonry and Concrete, Bulk Industrial Masonry Fasteners

Mindoub 3/8" x 5" Flat Head Sleeve Anchors – Precision Masonry Fasteners The Mindoub sleeve anchor series is engineered for high-performance fastening in solid concrete, brick, and stone. The 5-inch length is a versatile standard in the construction industry, providing the necessary reach for securing medium-thickness fixtures while maintaining deep embedment for structural stability. Whether you are a professional contractor or a dedicated DIYer, these anchors provide the reliability required for safety-critical installations. Advanced 360° Expansion Technology Standard anchors often concentrate all their pressure at a single point, which can lead to substrate failure. Our sleeve anchors feature a full-length expansion mechanism that distributes force 360 degrees throughout the hole. This uniform load distribution creates a superior grip and protects the integrity of your masonry, making them a dependable choice for both high-strength concrete and older brickwork. Flush-Mount Design for Enhanced Safety The countersunk flat-head design is specifically crafted for projects where a smooth, level finish is required. Once fully tightened, the head sits flush with the surface of the mounting material. This low-profile aesthetic not only looks professional but also serves as a vital safety feature by eliminating the trip hazards associated with traditional protruding hex-head bolts—making them ideal for walkways, thresholds, and garage floors. Professional Through-Fixing Efficiency Designed to save time on the job site, our anchors utilize a "through-fixing" installation method. The anchor diameter matches the required drill bit size (3/8"), allowing you to drill directly through your fixture while it is held in place. This one-step process eliminates the common frustration of marking holes, moving heavy equipment, and trying to re-align them later. Built for Structural Integrity Forged from high-strength carbon steel and treated with a heavy-duty zinc plating, these fasteners are built to resist oxidation and environmental wear. They are designed for long-term use in diverse environments, from humid basements and workshops to outdoor residential structures. Specifications: Brand: Mindoub Anchor Type: Flat Head Sleeve Anchor (Mechanical Expansion) Diameter: 3/8 inch Length: 5 inches (Ideal for 1.5" to 2.5" thick fixtures) Material: Zinc-Plated Carbon Steel Installation Method: Through-Fixing (Drill-Insert-Tighten) Recommended Use Cases: Sill Plate Mounting: Securing standard 2x lumber (1.5" actual thickness) to concrete foundations. Post Base Securing: Mounting metal deck post bases to concrete footings. Storage Solutions: Fixing heavy-duty industrial shelving or workbenches to garage floors. Safety Fixtures: Installing handrails, railings, and grab bars onto masonry walls. Important Compatibility Note: Specifically designed for anchoring fixtures TO solid concrete, brick, or masonry. These are mechanical expansion fasteners and are not suitable for wood-to-wood applications or use in drywall/plaster.

• 【Efficient Through-Fixing Installation】Featuring a "bit-size equals bolt-size" design (3/8"), these sleeve anchors allow you to drill directly through your fixture and into the masonry. This streamlined process eliminates the need to move heavy items or re-align holes, significantly speeding up structural mounting tasks.
• 【Safety-First Flush Mount Finish】The countersunk flat-head design ensures the anchor sits perfectly flush with the mounting surface once tightened. This low-profile finish is essential for high-traffic areas like garage floors, walkways, or patio bases, effectively eliminating trip hazards while maintaining a professional look.
• 【360° Uniform Expansion Grip】The full-length expansion sleeve distributes holding power evenly across the entire surface of the hole. This superior load distribution minimizes localized stress, providing a reliable hold in solid concrete, brick, or stone without causing the substrate to crack or blowout at the edges.
• 【Corrosion-Resistant Zinc Plating】Manufactured from high-strength carbon steel with a heavy-duty zinc coating. These fasteners are engineered to withstand environmental moisture and oxidation, ensuring long-term structural integrity for both indoor workshop equipment and outdoor residential fixtures.
• 【Specialized for Masonry Anchoring】Specifically designed for securing wood beams, metal brackets, or plates TO concrete and masonry surfaces. While ideal for anchoring sill plates or deck posts to foundations, please note these are not intended for wood-to-wood applications. Available in 25 and 50-packs for projects of any scale.
• 【Pro Tip】For a secure fit, ensure the hole is cleaned of all dust and debris before inserting the anchor. The 5-inch length is optimized for securing standard 2x lumber (1.5" actual thickness) to concrete with ample embedment depth.