Cap Nut Connecting Sleeve
钢管连接套筒
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Cap Nut Connecting Sleeve
Precast Concrete Embedded Fastener Product Brochure
1. Product Introduction
The Cap Nut Connecting Sleeve is a critical embedded hardware component in the prefabricated construction (PC) industry. Fabricated from seamless steel pipe and steel plate cap nut, it is designed for pre-embedment in concrete during the precast component production process.
Its primary functions include acting as a tie-rod connection for steel, aluminum and wood formwork to resist formwork deformation during concrete pouring, serving as an embedded bracing connector for diagonal braces to ensure structural stability of precast panels, and functioning as a precast railing anchor for secure post-installation connections. With a robust, corrosion-resistant design, this sleeve ensures long-term reliability in harsh construction environments.
2. Product Parameters & Specifications
| Parameter Category | Typical Specification / Range | Description |
|---|---|---|
| Material | Seamless steel pipe (Q235B / Q345B) + Carbon steel cap nut | High-strength base material for reliable load performance |
| Surface Treatment | Hot-dip galvanizing (HDG) / Zinc plating / Powder coating | Customizable for different corrosion environments |
| Thread Type | Metric (M16, M20, M24, etc.) / UNC / UNF | Customizable thread standards available |
| Outer Diameter (OD) | 20mm – 80mm | Customizable dimensions based on project requirements |
| Inner Diameter (ID) | 12mm – 60mm | Matched to corresponding thread size |
| Total Length | 50mm – 200mm | Customizable based on component thickness |
| Cap Nut Thickness | 5mm – 15mm | Adjustable for enhanced load capacity |
| Load Capacity | Static load: 5–50 kN | Varies by size and material; test reports available |
| Compliance | ISO 9001 certified; CE / ASTM optional | Full traceability from raw material to finished product |
3. Installation & Usage Instructions
3.1 Pre-embedment Preparation
- Verify sleeve dimensions (OD, ID, thread) match the formwork tie-rod or brace connector.
- Clean the concrete mold cavity to ensure no debris interferes with embedding.
3.2 Embedment Process
- Position the sleeve in the mold at the designed coordinate according to construction drawings.
- Secure it temporarily with tape or clamps to prevent displacement during concrete pouring.
- Pour concrete and vibrate to eliminate air voids, ensuring full compaction around the sleeve.
3.3 Post-Pour Installation
- After concrete curing (minimum 28 days, or per project specifications), remove temporary fixtures.
- Insert the tie-rod or brace into the sleeve and tighten with a wrench. Apply thread-locking adhesive if needed.
3.4 Maintenance
- Inspect threads and surface for corrosion or cracks periodically.
- Re-tighten threaded connections if loosening occurs.
4. Application Scenarios
- Precast Concrete Factories: Pre-embedded in precast walls, floors, stairs, and facades for formwork tie-rods or diagonal braces.
- Formwork Systems: Connecting steel, aluminum and wood formwork panels to resist lateral pressure during concrete pouring.
- Guardrail / Railing Systems: Pre-embedded in precast concrete bases for post-installation railing connections.
- Diagonal Bracing: Anchoring diagonal braces in precast structures to enhance seismic and wind resistance.
- Industrial Construction: Used in modular buildings, bridge segments, and infrastructure projects requiring reliable pre-embedded connections.
5. Safety Precautions
- Corrosion Risk: Ensure proper surface treatment (e.g., HDG) for outdoor and humid environments. Replace if severe corrosion occurs.
- Load Limits: Do not exceed the rated static load as specified in test reports. Overloading may cause structural failure.
- Installation Error: Misalignment during pre-embedment can lead to thread damage or connection failure. Verify coordinates before pouring.
- Thread Integrity: Avoid cross-threading or over-tightening; use calibrated wrenches. Apply thread-locking adhesive for critical connections.
- Worker Safety: Wear gloves and goggles when handling sleeves, especially during threading and installation operations.
6. OEM & ODM Customization Services
We offer full OEM and ODM services to meet the unique needs of global clients:
- Custom Dimensions: Tailored outer diameter, inner diameter, length, and cap nut thickness.
- Material Upgrades: Q345B, stainless steel (304/316), or alloy steel available for extreme environments.
- Surface Finish: Options include HDG, powder coating, zinc plating, and DACROMET.
- Thread & Connection: Customizable metric, UNC or UNF threads, with optional locking mechanisms such as cotter pin holes.
- Branding: Laser engraving of logo, batch number, or technical specifications on the sleeve and cap nut.
- Packaging: Custom wooden crates, anti-corrosion wrapping, and export-compliant packaging solutions.
7. Why Choose Us?
- Industry Expertise: Over 10 years of experience in precast construction hardware, trusted by PC factories worldwide.
- Quality Assurance: ISO 9001 certified with full traceability from raw material to finished product.
- Technical Support: Dedicated engineers provide CAD drawing, load calculation, and on-site guidance.
- Global Supply: Efficient logistics covering North America, Europe, Asia and Africa with fast delivery and competitive freight.
- Cost-Effective: Factory-direct pricing with no middleman, offering optimal rates for bulk orders.
📞 Contact our International Business Department today for exclusive catalogs and technical consultations!
