A sleeve anchor, also known as an expansion anchor, is a type of mechanical fastener used to secure objects to concrete, brick, or other masonry materials. It works by expanding within a pre-drilled hole to create a secure hold.
The Yellow Zinc-Plated Sleeve Anchor Bolt with an integrated L-Washer by Donghuang represents a highly adaptable mechanical fastening solution engineered for light to medium-duty structural attachments. Crafted from high-grade Carbon Steel, this fastener carries a substantial, reassuring weight in hand, reflecting its solid core density. The exterior is treated with a uniform, golden-yellow zinc plating that not only provides a smooth, tactile finish but also acts as a formidable barrier against oxidation.
What truly distinguishes this anchor is the precision-welded L-Washer. This specific component acts as a load-distributing shield, effectively spreading clamping forces across a wider surface area to prevent indentation or stress fractures on the attached fixture. Whether securing heavy-duty handrails, industrial electrical enclosures, or structural brackets to solid concrete, solid brick, or block substrates, this through-fastening mechanism ensures exceptional stability. Designed to meet DIN, ANSI, and GB specifications, it serves as a reliable, globally compliant foundation for indoor installations and covered outdoor frameworks.
The architecture of this sleeve anchor is meticulously engineered to maximize mechanical friction and grip strength. At its core, the cylindrical main body features a precision-machined expansion sleeve that responds instantly to applied torque. As the hexagonal bolt head is tightened, the internal cone is drawn upward, forcing the sleeve to flare outward evenly. This mechanical expansion principle creates an aggressive friction grip against the inner walls of concrete or masonry, locking the fixture firmly in place.
The built-in L-Washer is stamped from the same durable Carbon Steel, sitting perfectly flush against the substrate. Running your fingers along the threads, you will notice the complete absence of metal burrs—a direct result of advanced cold-heading and thread-rolling processes. While the standard finish is a vibrant yellow zinc plating, we also accommodate specialized surface treatment requests, including hot-dip galvanizing, nickel plating, and Dacromet coatings, ensuring optimal performance even in highly corrosive industrial environments.
To accommodate diverse structural demands, this anchor is manufactured in a comprehensive length spectrum ranging from 18mm to 400mm, with standard metric diameters including M6, M8, M10, M12, and M16. Beyond these standard dimensions, our extensive OEM/ODM capabilities allow for the production of non-standard, custom-profiled fasteners tailored to unique architectural blueprints or specific engineering requirements.
Our packaging protocol is designed for absolute security and logistical efficiency. Each anchor is individually sealed in a tear-resistant PE bag to prevent metal-on-metal abrasion during transit, preserving the pristine yellow zinc finish. These are then organized into reinforced corrugated boxes and stacked onto heavy-duty pallets (the standard Box+Carton+Pallet configuration). To further support our global supply chain, we provide transparent logistics management, including pre-shipment photographic confirmation of your packaged goods and flexible payment terms, ensuring your inventory arrives safely and exactly on schedule.
| Application | Machinery, Building |
| Finish | Color-Zinc Plated |
| Material | Carbon Steel |
| Standard | DIN, ANSI, GB |
| Length | 18mm-400mm |
| Trade Term | Fob, EXW, CIF |
| Delivery Time | 20-25 Days |
| Sample | Free |
| Connection | Common Bolt |
| Trademark | Donghuang |
| Transport Package | Box+Carton+Pallet |
| Origin | China |
| HS Code | 7318190000 |
Simplified Inventory Management: One of the most significant operational benefits of this sleeve anchor is its exceptional adaptability across multiple substrate types. Rather than requiring procurement teams to source different fastening systems for varying wall compositions, this single engineered solution performs reliably in solid concrete, solid brick, and standard blockwork. When inserted into the drilled cavity, the specialized sleeve adapts to the internal density of the material. This multi-substrate compatibility drastically simplifies inventory management for large-scale construction projects and reduces the risk of incorrect fastener application on the job site, allowing project managers to accelerate installation timelines.
Accelerated Workflow: Time is a critical metric on any job site, and this anchor is designed to minimize labor hours through its fully pre-assembled configuration. Arriving straight out of the box with the expansion sleeve, bolt, and L-Washer perfectly integrated, it eliminates the frustration of fumbling with loose components. The installation workflow is remarkably straightforward: simply drill a hole to the specified diameter, clear the dust, tap the anchor into place with a mallet (you will hear a solid, reassuring metallic resonance as it seats), and apply torque to the nut. The smooth, bind-free rotation of the nut ensures an effortless tightening process, significantly reducing operator fatigue.
Non-Destructive Extraction: While many heavy-duty anchors are strictly permanent—often requiring destructive methods to extract—this yellow zinc-plated variant offers the distinct operational advantage of removability. In scenarios involving temporary structural supports, directional signage, or modular machinery that requires periodic relocation, the bolt can be cleanly unthreaded. The L-Washer and bolt head can be removed without fracturing the surrounding concrete or leaving unsightly jagged metal protrusions. This non-destructive removal capability makes it an invaluable asset for commercial renovations, exhibition setups, and dynamic manufacturing floors where layouts frequently evolve.
Extended Fixture Lifespan: Balancing budget constraints with structural safety is a constant challenge in procurement. This sleeve anchor delivers exceptional mechanical holding power for light to medium loads, presenting a highly economical alternative to over-engineered, premium-priced heavy-duty anchors. The true value multiplier is the integrated L-Washer. By actively distributing the clamping load across a broader footprint, it prevents the bolt head from crushing or indenting softer fixture materials. This preventative design minimizes the long-term wear and tear on your attached assets, drastically reducing the hidden costs associated with fixture repair, material fatigue, and premature replacement.
Reliability is forged through rigorous verification. At Donghuang, our quality inspection system is integrated into every phase of production. We utilize advanced manufacturing equipment, including precision cold heading machines and automated CNC lathes, to maintain micro-level dimensional consistency across massive order volumes. Our testing protocols include:
We believe in proving our structural claims through tangible performance. To facilitate confident procurement decisions, we provide complimentary physical samples, allowing your engineering teams to conduct on-site pull tests, evaluate the tactile thread smoothness, and verify substrate compatibility firsthand. Beyond the physical product, our comprehensive after-sales and technical support ecosystem ensures total project security. We supply detailed Material Test Certificates (MTC), step-by-step installation guideline documents, and rapid-response technical troubleshooting. From the moment of inquiry through the entire lifecycle of your construction project, our dedicated support infrastructure is designed to mitigate risk and keep your operations running without interruption.
Beyond this specific sleeve anchor, Donghuang operates as a full-spectrum manufacturer of industrial fastening solutions. Our extensive catalog encompasses a wide array of expansion screws, specialized structural fasteners, precision hardware parts, plastic components, stamping parts, and zinc die castings. Furthermore, our core competency lies in the engineering of non-standard, custom parts. Whether you require a unique thread pitch, an oversized washer configuration, or a proprietary anti-galling coating, our OEM/ODM division is fully equipped to translate your technical drawings into mass-produced reality, delivering bespoke hardware tailored to the exact specifications of your most complex engineering challenges.
The standard yellow zinc-plated finish is expertly formulated to provide reliable oxidation resistance for indoor applications, climate-controlled facilities, and covered outdoor environments (such as under awnings or inside parking garages). However, for installations subjected to direct, harsh elemental exposure—such as marine environments, open-air garden decking, or areas with high atmospheric salinity—we strongly advise transitioning to our stainless steel variants or requesting a custom Dacromet or hot-dip galvanized surface treatment. These specialized finishes are specifically engineered to withstand prolonged exposure to UV radiation, acidic rain, and salt spray, ensuring the mechanical joint remains secure and rust-free over decades of use.
The structural relationship between the bolt and the L-Washer is permanent by design. During the manufacturing process, the washer is securely integrated onto the bolt shaft using precision assembly techniques before the threading is rolled. This means the washer is physically captive; it cannot slip over the threads or detach during transit, handling, or overhead installation. This captive design guarantees that the installer will never drop or lose the washer in tight spaces. Furthermore, the washer's thickness and carbon steel grade are rigorously load-tested in tandem with the bolt, ensuring it will not warp, cup, or deform under maximum specified torque loads.
