The Barb Sleeve Anchor (commonly referred to as a barbed sleeve expansion bolt, fishbone expansion anchor, anti-rotation sleeve anchor, or masonry barb anchor) is an advanced heavy-duty mechanical anchor engineered specifically for secure fastening into concrete, solid brick, hollow block, and aerated masonry. Unlike conventional smooth-sleeve anchors, the barb sleeve anchor features sharp, outward-stamped directional teeth (barbs) along its cylindrical sleeve. As the conical wedge bolt is tightened, these barbs bite directly into the interior walls of the drilled hole, preventing the sleeve from spinning inside the masonry while establishing an irreversible mechanical interlock in accordance with global ISO standards.
Technical Specifications of Barb Sleeve Anchor Expansion Bolts
We supply Class 4.8 and Class 8.8 carbon steel barb sleeve anchors in both Electro-Zinc Plated (EG) and Hot-Dip Galvanized (HDG) anti-corrosion surface finishes. The barbed design is particularly effective in softer concrete or aged brickwork where standard smooth anchors tend to slip.
| Parameter | Electro-Zinc Plated Barb Sleeve Anchor | Hot-Dip Galvanized (HDG) Barb Sleeve Anchor |
|---|---|---|
| Core Material Grade | Class 4.8 / Class 8.8 Carbon Steel (Q235B / 45#) | Class 4.8 / Class 8.8 Carbon Steel (Q235B / 45#) |
| Sleeve Feature | Precision Stamped Outward Barb Teeth & Slotted End | Precision Stamped Outward Barb Teeth & Slotted End |
| Anti-Rotation Mechanism | Multi-Directional Barb Bite into Hole Wall | Multi-Directional Barb Bite into Hole Wall |
| Protective Zinc Coating | 5 µm – 12 µm Electro-Zinc Plated (Blue-White / Yellow) | 45 µm – 65 µm Molten Hot-Dip Zinc Layer |
| Substrate Suitability | Concrete, Solid Brick, Hollow Block, Stone | Outdoor Concrete Structures, Guardrails & Substation framing |
Precision Manufacturing and Working Mechanics of Barbed Anchors
At our manufacturing plant in Handan, China, barb sleeve anchors undergo automated cold heading, barb sleeve stamping, zinc plating, and pre-assembly:
- Precision Cone Bolt Forging: High-speed cold formers forge steel wire rod into exact conical wedge bolts with chamfered thread ends for easy nut engagement.
- Multi-Stage Barb Sleeve Stamping: High-tonnage punch presses stamp strip steel, forming outward angled teeth (barbs) and expansion slots that ensure even 360-degree radial thrust when expanded.
- Electro-Plating & Corrosion Protection: Trivalent chromium (Cr3+) electro-zinc plating provides bright rust resistance, while hot-dip galvanizing offers thick protection for harsh environments.
- 100% Pre-Assembly Inspection: Cone bolts, barbed sleeves, flat washers, spring washers, and hex nuts are pre-assembled on automated machinery for immediate job-site placement.
Key Engineering Applications of Barb Sleeve Anchors
Barb sleeve anchors provide unmatched holding strength across challenging construction and masonry substrates:
- Building Curtain Wall & Steel Bracket Mounting: Fastening aluminum facade brackets, stone cladding supports, and steel framing baseplates to concrete structures.
- Hollow Brick, Aerated Concrete & Masonry Anchoring: Fixing heavy brackets and equipment where standard smooth anchors fail due to hole slippage or crumbling substrate.
- HVAC Ducting, Cable Trays & Security Doors: Mounting air conditioning duct hangers, heavy cable management trays, anti-theft door frames, and window guardrails.
Quality Control and Export Packaging for Barbed Anchors
Handan YiHao Fastener enforces strict Quality Assurance (QA) standards for all overseas export orders. Testing procedures include 100% pull-out tension tests in concrete and masonry, barb height and angle checks, coating thickness gauge tests, and salt spray validation.
All export items are bulk packed in heavy-duty 25kg inner cartons, neatly stacked on ISPM 15 compliant fumigated wooden pallets, and wrapped in protective stretch film for safe ocean freight.
Request Factory Direct Pricing for Barb Sleeve Anchors
Looking for a trusted manufacturer in Handan, China for carbon steel zinc-plated or HDG barb sleeve anchors / fishbone expansion bolts? Contact Handan YiHao Fastener today for technical datasheets, pull-out load test reports, free samples, and direct bulk export quotes.
