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A brass knurled drop-in anchor serves as a heavy-duty mechanical fastener engineered for secure, permanent anchoring in solid substrates such as concrete, solid brick, and masonry. Crafted from dense, free-machining brass, this expansion bolt feels substantial in hand, reflecting its solid metallic composition. The core design features a precision-tapered internal cone and a knurled exterior wall. As a threaded bolt or rod is driven into the anchor, the internal cone forces the brass body to expand outward, biting aggressively into the surrounding material. This creates a formidable friction hold that resists pull-out forces. Ideal for environments demanding frequent fixture removal or reliable corrosion resistance, these anchors provide a flush, clean finish once installed. The golden hue of the natural brass also offers an aesthetically pleasing appearance for visible installations, blending mechanical reliability with a refined metallic finish.
Reviewing the precise specifications of our brass expansion bolts ensures proper alignment with your engineering requirements. The table below outlines the exact dimensions, materials, and certifications associated with our standard product line. Understanding these parameters—ranging from the 9-38mm length options to the plated copper surface treatment—helps procurement specialists verify compatibility with specific machinery, chemical plant infrastructure, or environmental building projects. We maintain strict adherence to DIN standards and ISO 9001 certification, ensuring every unit delivered matches these published figures. With a robust production capacity of 500 tons per month, we can confidently support large-scale continuous construction phases without supply interruptions. The provided HS code (7318190000) facilitates smooth international logistics and customs clearance.
| Model NO. | DIN Standard |
| Connection | Welding |
| Surface Treatment | Plated Copper |
| Head Type | Round |
| Length | 9-38mm |
| Usage | Machinery, Chemical Industry, Environmental, Build |
| Certifications | ISO 9001 |
| Sample | Free |
| Transport Package | Export Shipping Standard Package |
| Trademark | Donghuang |
| Origin | China |
| HS Code | 7318190000 |
| Production Capacity | 500tons/Month |
General Construction & Masonry: These anchors are fundamental for attaching structural fixtures to solid concrete and brickwork. Their reliable expansion mechanism ensures that heavy architectural elements remain firmly anchored over decades of use.
HVAC and Plumbing Systems: Essential for suspending heavy ductwork, securing pipe supports, and mounting climate control equipment. The brass construction resists the condensation and moisture typically found in these utility spaces.
Electrical Infrastructure: Highly effective for mounting heavy cable trays, conduit clamps, and industrial electrical panels. The secure hold prevents sagging or detachment, maintaining safety in critical power distribution networks.
Furniture and Fixture Mounting: Frequently utilized to secure commercial shelving units, heavy cabinetry, and permanent interior fixtures. The flush installation allows for clean aesthetics without protruding studs.
Challenging Indoor and Outdoor Environments: Thanks to the inherent corrosion resistance of the brass material and plated surface options, these anchors perform exceptionally well in exposed outdoor settings or environmentally demanding indoor facilities.
Achieving maximum load capacity requires precise installation. Follow these critical steps to ensure a permanent, secure hold in your solid substrate:
A: The hole must be drilled with a carbide-tipped masonry bit that perfectly matches the outside diameter of the brass anchor. A precise fit is mandatory to ensure the knurled exterior can generate sufficient friction against the concrete walls during expansion.
A: The drilled hole should be at least as deep as the total length of the anchor. However, structural guidelines dictate that the hole should not be placed closer than two anchor diameters to the bottom edge of the concrete slab to prevent structural blowout.
A: Yes, absolutely. Concrete Fasteners and industry standards emphasize that cleaning the hole with compressed air and a wire brush is non-negotiable. Residual silica dust acts as a lubricant, which can cause the anchor to slip under heavy load.
A: You must use a specialized setting tool designed specifically for drop-in anchors. Insert the tool and tap it with a heavy hammer until the tool's shoulder makes full contact with the top of the anchor, ensuring the internal cone is fully driven.
A: Yes, these brass expansion bolts can be countersunk below the concrete surface. To achieve this, you will need a longer setting tool to reach the internal cone and ensure proper expansion without damaging the surrounding substrate.
Recognizing that complex engineering projects often require specific fastening solutions, we offer comprehensive OEM and ODM customization services. Our engineering team supports CAD and 3D drawing submissions to develop bespoke anchors tailored to your exact specifications. Whether you require unique dimensional adjustments, specialized brass material ratios, or custom internal thread pitches, we can flexibly adapt our manufacturing process to meet your personalized engineering demands.
Furthermore, our robust supply chain is optimized for global distribution and project stability. We ensure secure transit by utilizing standard export cartons and reinforced pallets for all shipments. For custom developments, we provide rapid prototyping and sampling within a 5 to 10-day turnaround window. Supported by a multimodal global logistics network encompassing sea, land, and air freight, we guarantee stable, on-time deliveries to keep your construction schedules on track, regardless of your geographic location.
