In railway infrastructure, the Nabla railway fastener system plays a key role. Its standards cover multiple aspects such as design, materials, manufacturing, installation and testing, which are of great significance to ensure the safe and stable operation of railways.
Design standards
The design of the Nabla system needs to accurately match the operational requirements of different railway types (such as trunk railways, light rails, subways, etc.).
Material standards
The selection of materials for each component of the system follows strict standards. For example, elastic springs often use 60Si2MnA and 60Si2CrA spring steels. After special heat treatment, these steels have excellent elasticity and fatigue resistance, and can provide stable buckling pressure for rails under long-term complex working conditions.
| Nabla Rail Fastening System | |||
| Part Name | Pcs / Set | Types | Material |
| Nabla Clip | 2 | Thickness: 4mm or 4.5mm | 60Si2MnA / 60Si2CrA |
| Rail Insulator | 2 | For Rail of UIC54,UIC60, | Reinforced Nylon 66 (PA66) |
| 50kg rail,60kg. | |||
| Double Head Screw Spike | 2 | For Rail of UIC54,UIC60, | Grade 4.6: Q235 |
| 50kg, 60kg. | Grade 5.6: 35# | ||
| Grade 8.8: 45# | |||
| Nut | 2 | Can be customized | Grade 5: 35# |
| Grade 8: 45# | |||
| Spring | 2 | Can be customized | ML08AL, 60Si2MnA, 65Mn |
| Spring Washer | 2 | 18.25×34×78mm | ML08AI |
Manufacturing standards
The manufacturing process strictly follows the ISO quality management system and starts with the purchase of raw materials. Suppliers are required to provide testing indicators such as production batch number, chemical composition, mechanical properties, etc., and conduct random inspections and batch inspections on raw materials. During production, corresponding physical and chemical tests are carried out according to product characteristics to ensure product quality.
Installation standards
When installing the Nabla system, it is necessary to operate according to detailed specifications. For example, the tightening torque of the bolts must be strictly implemented according to the specified value to ensure that the connection is firm and the parts are not damaged by over-tightening. The laying position of the rubber pad (rubber pad under the rail or under the sleeper) must be accurate to effectively reduce vibration and noise. At the same time, the installation order of each component must be correct so that the system can work together and perform at its best.
Testing standards
Establish a complete testing system to conduct comprehensive testing of finished products. Through appearance inspection, ensure that the product is defect-free and the size meets the standard. Use professional equipment to test the mechanical properties of the components, such as fatigue testing of shrapnel and tensile testing of bolts. In addition, for plastic and rubber components, weather resistance, wear resistance and other tests must be carried out to ensure the reliability of the system under different environmental conditions.