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Help CenterFor Concrete Sleeper Insulation in Tunnel Engineering, Nylon Sleeve, 20mm ID, 40mm L, Electrical Insulation
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Welcome to Anping County Boli Hardware Wiremesh Products Factory – your trusted partner for high-quality nylon insulating sleeves designed specifically for concrete sleeper insulation in tunnel engineering. Our 20mm ID, 40mm L nylon sleeve delivers exceptional electrical insulation performance and mechanical durability to meet the rigorous demands of modern railway and tunnel infrastructure. With over 20 years of manufacturing experience (since 1998) and an annual export value of US$5–10 million, we ensure every product meets international quality standards.
Our nylon sleeves are precision-engineered to securely isolate concrete sleepers from electrical currents, preventing leakage and enhancing safety in tunnel environments. The 20mm inner diameter fits standard sleeper bolts, while the 40mm length provides optimal coverage. Made from high-grade nylon (PA6/PA66), these sleeves offer excellent resistance to moisture, chemicals, and mechanical stress, ensuring long-term reliability in underground conditions.
Key Features & Technical Specifications
- High Electrical Insulation: Dielectric strength >20 kV/mm, prevents current leakage and arcing.
- Precision Dimensions: Inner diameter 20mm ±0.2mm, length 40mm ±0.5mm, burr-free smooth edges.
- Durable Material: Nylon PA6 or PA66, with high tensile strength and impact resistance.
- Temperature Resistance: Operates from -40°C to +120°C, suitable for extreme tunnel climates.
- Corrosion & Chemical Resistance: Resists oils, greases, and tunnel de-icing agents.
- Customizable Options: Colors (black, white, custom), outer diameter, and length available upon request.
- Easy Installation: Lightweight and flexible, snaps quickly onto sleeper bolts without tools.
- Eco-Friendly: RoHS compliant, recyclable material.
| Parameter | Value |
|---|---|
| Inner Diameter | 20 mm |
| Outer Diameter | 26 mm (standard) / Customizable |
| Length | 40 mm |
| Material | Nylon PA6 / PA66 |
| Dielectric Strength | ≥20 kV/mm |
| Working Temperature | -40°C to +120°C |
| Tensile Strength | ≥70 MPa |
| Application | Concrete sleeper insulation in tunnels |
Why Choose Our Nylon Sleeves?
- Proven in Tunnel Projects: Our sleeves have been used in major railway tunnels across North America, Europe, and Southeast Asia, providing reliable insulation for thousands of concrete sleepers.
- Cost-Effective Solution: Compared to rubber or ceramic alternatives, nylon sleeves offer a longer service life at a lower total cost, reducing maintenance frequency.
- Consistent Quality Control: Every batch undergoes strict dimension checks, insulation resistance tests, and visual inspection before shipment.
- Factory Direct Pricing: As a manufacturer based in Hengshui, Hebei, we eliminate middlemen, offering competitive pricing without compromising quality.
- Flexible Customization: Need a different ID, OD, or length? We can produce custom dimensions to match your specific sleeper bolt design.
Our company – Anping County Boli Hardware Wiremesh Products Factory – has been a leading manufacturer of wire mesh and hardware products since 1998. With an annual export value of US$5–10 million, we serve clients in more than 20 countries, including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and domestic markets. We ship from major Chinese ports (Tianjin, Qingdao, Shanghai, Foshan) with fast lead times and reliable logistics.
We are committed to quality, consistency, and customer satisfaction. Our factory is equipped with modern injection molding machines and precision tooling, ensuring each nylon sleeve meets tight tolerances. We also offer free samples for evaluation before bulk orders, allowing you to test the fit and performance in your tunnel application.
Contact us today to request a quote, discuss your custom requirements, or place an order. Let our expertise in concrete sleeper insulation support your tunnel engineering projects with reliable, cost-effective nylon sleeves.
Frequently Asked Questions (FAQ)
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Q: What is the main function of this nylon sleeve in tunnel engineering?
A: It provides electrical insulation between concrete sleepers and metal bolts, preventing current leakage and ensuring safe operation of railway signaling systems in tunnels. -
Q: Can the inner diameter be customized for different bolt sizes?
A: Yes, we offer custom inner diameters ranging from 10mm to 50mm. Please provide your bolt specification for a tailored solution. -
Q: Is this sleeve resistant to water and chemicals found in tunnels?
A: Absolutely. Nylon PA6/PA66 has excellent resistance to moisture, oils, greases, and many chemicals, making it ideal for humid tunnel environments. -
Q: What is the typical lead time for bulk orders?
A: For standard sizes (20mm ID, 40mm L), we can ship within 10–15 days after order confirmation. Custom sizes may require 20–25 days depending on complexity. -
Q: Do you provide samples for testing?
A: Yes, we offer free samples (up to 5 pieces) for customer evaluation. Shipping cost is collected. Please contact us to request samples. -
Q: What is the minimum order quantity (MOQ)?
A: Our MOQ for standard sleeves is 1000 pieces. For custom sizes, MOQ may be higher; please inquire for details. -
Q: How do you ensure the quality of the sleeves?
A: We use high-quality raw materials, conduct in-process inspection, and perform final checks including dimensional measurement, dielectric strength test, and visual inspection before packing. -
Q: Can this sleeve be used in non-tunnel applications like railway tracks or bridges?
A: Yes, it is also suitable for general railway sleeper insulation, bridge deck insulation, and any application requiring electrical isolation between metal and concrete.
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