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Help CenterNylon 66 Sleeve for Concrete Sleepers Inner Diameter 20mm Outer Diameter 30mm Length 50mm
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Premium Nylon 66 Sleeve for Concrete Sleepers – Precision Engineered for Railway Infrastructure
As a trusted manufacturer since 1998, Anping County Boli Hardware Wiremesh Products Factory specializes in producing high-performance Nylon 66 sleeves designed specifically for concrete sleepers in railway systems. Our sleeves with inner diameter 20mm, outer diameter 30mm, and length 50mm offer exceptional durability, dimensional accuracy, and resistance to harsh environmental conditions. With over two decades of export experience and annual export value exceeding US$5 million, we deliver reliable components that meet the demanding requirements of global railway projects.
These Nylon 66 sleeves serve as critical insulating and protective bushings for bolts and anchors embedded in concrete sleepers, ensuring long-term stability and safety of rail tracks. The material's inherent properties—high mechanical strength, excellent wear resistance, low moisture absorption, and superior electrical insulation—make it the ideal choice for both standard and heavy-haul railway lines.
Key Features & Technical Specifications
- Material Excellence: Made from 100% virgin Nylon 66, offering outstanding tensile strength (≥80 MPa) and impact resistance even at low temperatures.
- Precision Dimensions: Inner diameter 20mm ±0.1mm, outer diameter 30mm ±0.1mm, length 50mm ±0.2mm, ensuring tight fit and consistent performance.
- Wide Temperature Range: Operates reliably from -40°C to +120°C, suitable for extreme climates.
- Corrosion & Chemical Resistance: Resistant to oils, greases, alkalis, and many solvents, extending service life in track environments.
- UV & Weather Resistance: Stabilized formulation prevents degradation under sunlight and moisture exposure.
- Easy Installation: Smooth surface reduces friction during insertion; sleeves can be cut or machined to custom lengths if required.
- Customizable Options: Available in different colors (black, natural, or custom) and packaging (bulk bags, cartons, pallets).
| Parameter | Specification | Tolerance |
|---|---|---|
| Inner Diameter | 20 mm | ±0.1 mm |
| Outer Diameter | 30 mm | ±0.1 mm |
| Length | 50 mm | ±0.2 mm |
| Material | Nylon 66 (PA66) | Virgin grade |
| Color | Black (standard) | Customizable on request |
| Operating Temperature | -40°C to +120°C | Continuous |
| Tensile Strength | ≥80 MPa | ASTM D638 |
Advantages for Railway Applications
- Enhanced Safety: Provides electrical insulation between steel bolts and concrete, preventing galvanic corrosion and short circuits in signaling systems.
- Reduced Maintenance: Nylon 66's low coefficient of friction minimizes bolt loosening over time, lowering track inspection frequency.
- Long Service Life: Withstands repeated dynamic loads from passing trains without cracking or deforming, typically lasting 10+ years in normal conditions.
- Cost-Effective: Lightweight nature reduces shipping costs; easy installation saves labor time compared to metal alternatives.
- Eco-Friendly: Nylon 66 is recyclable and RoHS compliant, supporting sustainable railway construction.
Frequently Asked Questions (FAQ)
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Q: What is the difference between Nylon 6 and Nylon 66 for this sleeve?
A: Nylon 66 offers higher mechanical strength, better dimensional stability, and superior heat resistance compared to Nylon 6. It is the preferred material for heavy-duty railway applications that require long-term reliability. -
Q: Can these sleeves be used in prestressed concrete sleepers?
A: Yes, our sleeves are designed to fit standard bolt holes in prestressed concrete sleepers. The 20mm inner diameter accommodates M20 bolts, and the 30mm outer diameter ensures proper anchoring. -
Q: What is the maximum operating temperature for continuous use?
A: The sleeves can operate continuously at up to 120°C. For short-term exposure, temperatures up to 150°C are permissible. Please consult our technical team for extreme conditions. -
Q: Do you offer custom sizes or colors?
A: Absolutely. We can produce sleeves with different inner/outer diameters, lengths, and colors (e.g., yellow, white) based on your specifications. Minimum order quantities may apply. -
Q: How are the sleeves packaged and shipped?
A: Standard packaging is in poly bags inside strong cartons or on pallets, suitable for ocean or air freight. We can also customize packaging per your request. -
Q: What is the typical lead time for large orders?
A: For orders of 10,000 pieces or more, lead time is approximately 15–25 working days, depending on current production schedule. Express shipping is available for urgent needs. -
Q: Are these sleeves resistant to UV radiation?
A: While Nylon 66 naturally has moderate UV resistance, our standard formulation includes UV stabilizers for outdoor use. For prolonged direct sunlight exposure, we recommend using black-colored sleeves which offer best UV protection. -
Q: Do you provide samples for testing?
A: Yes, we offer free samples (shipping cost may apply) for evaluation. Please contact us with your requirements and we will arrange sample delivery.
Trusted by Global Railways – Why Choose Anping Boli?
With our factory established in 1998, we have accumulated more than 25 years of expertise in manufacturing precision nylon components. Our annual export value of US$5–10 million reflects strong demand from North America, South America, Europe, Southeast Asia, Africa, and Oceania. We ship from major ports including Tianjin, Qingdao, Shanghai, and Foshan, ensuring timely delivery worldwide. Every batch of sleeves undergoes strict dimensional inspection, material testing, and visual quality control before shipment. We are committed to providing reliable products that keep your railway infrastructure safe and efficient. Contact us today for competitive pricing, technical support, and customized solutions.
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