Definition and Role of the E-Type Elastic Clip
The E-type elastic clip is a spring-steel component of the rail fastening system. It works together with the track bolt and the rail tie plate to hold the steel rail in position, and together these parts form a complete fastening assembly. The clip is manufactured by forming and heat treatment from spring steel such as 60Si2MnA, and the heat treatment, quenching and tempering, is what gives the clip its elastic properties and its ability to return to shape after deflection. A correctly stored clip keeps those properties; a clip that has rusted or lost its temper through poor storage cannot be restored on site.
Common E-Clip Specifications
E-type clips are supplied in several models that share the same steel grade and hardness but differ in bar diameter and weight to suit different rail sections and clamping force classes. The table below lists typical values.
| Model | Bar diameter | Material | Load under pressure | Hardness | Weight |
|---|---|---|---|---|---|
| E1609 | Ø16 mm | 60Si2MnA | ≥950 kg | HRC 44–48 | 0.43 kg/pc |
| E1809 | Ø20 mm | 60Si2MnA | ≥950 kg | HRC 44–48 | 0.61 kg/pc |
| E1813 | Ø18 mm | 60Si2MnA | ≥950 kg | HRC 44–48 | 0.62 kg/pc |
| E2001 / E2007 / E2009 / E2039 / E2055 / E2056 / E2063 | Ø20 mm | 60Si2MnA | ≥950 kg | HRC 44–48 | 0.80 kg/pc |
Weights range from about 0.43 kg for the smaller E1609 to 0.80 kg for the Ø20 mm models, so a pallet of clips represents a substantial quantity of heat-treated spring steel whose condition must be preserved through the supply chain.
Recommended Storage Conditions
E-clips should be stored in a clean, dry, ventilated area, away from direct sunlight, away from heat sources that push the ambient temperature above 60 degrees Celsius, and away from chemicals such as acids and solvents. Clips should be stacked neatly in labelled containers or on pallets, and each batch should carry its model, heat-treatment lot and delivery date. For outdoor sites or long-term storage, cover the stacks with moisture- and sun-proof tarpaulins and keep them off the ground on boards or pallets so that air can circulate underneath and water cannot pool at the base. These measures prevent rust formation, coating damage and polymer degradation before the clips reach the track.
Why Storage Conditions Matter
Material integrity is the first reason. E-clips are frequently supplied together with rubber pads and nylon insulators, and both polymers are sensitive to ultraviolet light, heat and chemicals; degradation of these components reduces the cushioning and insulation performance of the assembled fastening. The second reason is performance: the clip must keep its elasticity and shape so that it generates the designed clamping force when installed. A clip that has been exposed to sustained heat, moisture or corrosive atmospheres can lose hardness, rust at the bearing surfaces, or take a permanent set during storage, and such a clip will not hold the rail securely. The storage rules are therefore not warehouse convenience; they protect the functional properties that the buyer has paid for.
Handling and Inspection Before Installation
Before installation, inspect each batch for rust, coating damage, distortion and foreign material in the packaging. Clips that show surface rust at the rail foot contact or on the bearing shoulders should be set aside, because the corrosion reduces the effective section and can initiate fatigue cracks under traffic. During transport and handling, avoid dropping or throwing clips, which can bend the legs and alter the toe load. Store clips with the same specification together, keep the heat-treatment certificates with the batch, and rotate stock so that older batches are used first. On site, keep the opened containers covered at the end of each working day; the most common cause of clip corrosion is not the warehouse but the open worksite exposure.
Frequently Asked Questions
What temperature limit applies to clip storage?
Keep the storage environment below 60 degrees Celsius. Sustained heat above this level can relax the spring steel and degrade rubber and nylon components.
Can E-clips be stored outdoors?
Yes, for short periods, provided they are kept off the ground on pallets or boards and covered with moisture- and sun-proof tarpaulins. Long-term storage should always be indoors in a dry, ventilated area.
Why must clips be kept away from acids and solvents?
Acids attack the steel surface and the protective coating, while solvents damage the rubber pads and nylon insulators supplied with the clips, reducing their cushioning and insulation function.
How much does an E-type clip weigh?
Typical weights range from about 0.43 kg per piece for the E1609 to 0.80 kg per piece for the Ø20 mm models such as E2001, E2007 and E2055.
What should be checked when receiving a clip delivery?
Check the model and bar diameter against the order, look for rust, distortion and coating damage, verify the heat-treatment certificate, and confirm that rubber and nylon accessories are intact and labelled.
Does proper storage affect clip performance?
Directly. A clip that is rusted, distorted or degraded during storage loses spring force and clamping ability, so correct storage is part of guaranteeing the fastening system's performance.