Rail Clamp - Rail Fasteners
Similar to elastic rail clips or KPO rail clips, a rail clamp — also known as a rail clip or fixing clip — is a fastening device designed to hold the rail laterally in place, particularly crane rails, while still allowing the required longitudinal movement.
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What are rail clamps?
A rail clamp is a critical fastening component used to secure steel rails to sleepers (ties) or crane girders. It stabilizes the track, maintains gauge, and prevents vertical or lateral movement while often allowing for necessary longitudinal expansion. These devices are commonly used for heavy-duty applications like crane rails in ports or industrial plants. For types, boltable rail clamps and weldable rail clamps are main varieties.
Types of Railway Clamp:
| Product Name / Model | Description / Characteristics | Remarks / Application |
|---|---|---|
| Crane Clamp 21/050 AN/BN | Enables rail installation with good tolerances; adjustable for precise alignment; designed to carry heavy crane loads. | Can be bolted or welded according to user needs. |
| Crane Clamp 22/130 AN/BN | A self-locking design from GNEE RAILWAY RAILWAY; secures and fixes rails with a rubber nose. | Can be used with different rail types by adjusting the height of the rubber nose. |
| KPO Rail Clamp | A high-strength, boltable clip. | Popular models include KPO3, KPO6, KPO9. Used in rail fastening systems with ribbed tie plates, rail bolts, and washers. |
| Other Clamps | MTH clamp, K type rail clamp, Rail Clamp for North Africa. | GNEE RAILWAY RAILWAY also produces "K" and "MTH" type clamps, as well as clamps for the North African Railway. |
Rail Clamp Raw Materials:
| Name | Rail Clamps | ||
|---|---|---|---|
| Material | Q235-forging | ZG35-cast steel | QT500-7-cast iron |
| Chemical composition(%) | C:0.12-0.20, Mn:0.30-0.70, Si:≤0.3, P:≤0.045, S:≤0.045 | C: ≤0.4, Mn:≤0.9, Si: ≤0.5, P:≤0.04, S:≤0.04 | C:3.60-3.80, Mn:≤0.6, Si:2.50-2.90, P:≤0.08, S:≤0.025 |
Specifications of Rail Clamp
Common Elastic Rail Clamp Types and Dimensions:
The most significant physical dimension that dictates a clip's strength is the diameter of the spring steel bar from which it is formed. A larger diameter results in a stiffer, stronger clip capable of generating higher clamping forces.
|
Bar Diameter (mm) |
Typical Toe Load (kgf) |
Primary Application |
|
12-14 mm |
400 – 650 |
Light Rail Transit (LRT), Metro, Industrial Track |
|
16-18 mm |
750 – 1200 |
Mainline Passenger, Mixed-Traffic Routes |
|
18-20+ mm |
1200 – 2500+ |
Heavy-Haul Freight, High-Speed Lines |
Technical parameters of 9120/15/38 rail clamp：
| REF NO. | X (mm) | Y THIN UNT (mm) | Z (mm) | WEIGHT KG |
|---|---|---|---|---|
| 9120/15/38 | 38 | 51 | 30 | 1.52 |
| S (rubber) | RAIL WITH PAD PLAN | 14mm | ||
| H (rubber) | RAIL WITHOUT PAD PLAN | 21mm |
| RAIL | F (mm) | C (mm) | A (mm) | WEIGHT (kg) | 1. CLIP REFERENCE (FOR RAIL WITH PAD) | 2. CLIP REFERENCE (FOR RAIL WITHOUT PAD) |
|---|---|---|---|---|---|---|
| P50 | 132 | 70 | 152 | 50 | 9120/15/38 (S) | 9120/15/38 (H) |
| QU70 | 120 | 70 | 120 | 52.8 | 9120/15/38 (S) | 9120/15/38 (H) |
| OU80 | 130 | 80 | 130 | 63.69 | 9120/15/38 (S) | 9120/15/38 (H) |
| QU100 | 150 | 100 | 150 | 89 | 9120/15/38 (S) | 9120/15/38 (H) |
| Q0120 | 170 | 120 | 170 | 118.5 | 9120/15/38 (S) | 9120/15/38 (H) |
| A100 | 200 | 100 | 95 | 74.3 | 9120/15/38 (S) | 9120/15/38 (H) |
| AL20 | 220 | 120 | 105 | 100 | 9120/15/38 (S) | 9120/15/38 (H) |
| A150 | 220 | 150 | 150 | 150.3 | 9120/15/38 (S) | 9120/15/38 (H) |
| ISCR100 | 150 | 102 | 150 | 89 | 9120/15/38 (S) | 9120/15/38 (H) |
| ISC120 | 170 | 120 | 170 | 118.5 | 9120/15/38 (S) | 9120/15/38 (H) |
| GCR183 | 280 | 75 | 120 | 183.06 | 9120/15/38 (S) | 9120/15/38 (H) |
| CR73 | 140 | 100 | 135 | 73.3 | 9120/15/38 (S) | 9120/15/38 (H) |
| CRC100 | 155 | 120 | 150 | 100.2 | 9120/15/38 (S) | 9120/15/38 (H) |
| JIS50N | 127 | 64 | 153 | 50.4 | 9120/15/38 (S) | 9120/15/38 (H) |
| JIS60 | 145 | 64 | 174 | 60.8 | 9120/15/38 (S) | 9120/15/38 (H) |
| S41 | 125 | 67 | 138 | 41.4 | 9120/15/38 (S) | 9120/15/38 (H) |
| $49 | 125 | 67 | 149 | 49.43 | 9120/15/38 (S) | 9120/15/38 (H) |
| MRS67(135CR) | 132 | 79 | 146 | 67 | 9120/15/38 (S) | 9120/15/38 (H) |
| MRS86 | 165 | 102 | 102 | 85.5 | 9120/15/38 (S) | 9120/15/38 (H) |
| MRS87B | 152 | 102 | 152 | 86.8 | 9120/15/38 (S) | 9120/15/38 (H) |
| 68kgAS | 152 | 73 | 186 | 67.6 | 9120/15/38 (S) | 9120/15/38 (H) |
The Role of Rail Clamp on Rail Fastening System
Rail clamps are vital, rigid fasteners used to secure steel rails to ties (sleepers), maintaining gauge, stability, and preventing vertical/horizontal movement. They act as crucial intermediate connectors in high-speed, heavy-haul, and crane rail applications, ensuring consistent clamping force to improve track stability, safety, and operational longevity.
Key Roles of Rail Clamps:
- Secure Rail Fixing: They firmly attach the rail to the sleeper, preventing longitudinal and lateral movement of the rail.
- Gauge Maintenance: By fixing the rail position, they ensure that the gauge distance between rails remains precise, which is essential for safe train operation.
- Stability and Safety: Rail clamps provide high rigidity, contributing to the overall stability of the track system.
- Operational Support: They are widely used in specialized applications, including port machinery, crane rails, and heavy-haul rail systems to handle immense loads.
- Reduced Maintenance: Their strong, stable clamping force reduces the need for frequent maintenance compared to less robust fastening methods.
Frequently Asked Questions About Rail Clamps
Q: What is the difference between a rail clamp and a rail clip?
A: While both terms are sometimes used interchangeably, rail clamps typically refer to heavier-duty fastening devices for crane rails and industrial applications, often with higher load capacities (like 165kN) and more robust construction than standard railway clips .
Q: How do I prevent corrosion of rail clamps?
A: Options include: (1) Choose stainless steel material for severe environments, (2) Select hot-dip galvanized finish for coastal areas, or (3) For standard environments, apply periodic oil and paint to corroded areas .
Q: What happens if installation is incorrect?
A: Incorrect installation may shorten service life and cause deformation. Ensure the clip maintains appropriate clearance from other components during installation .
GNEE RAILWAY RAILWAY, established in 2008, operates as a specialized manufacturer of railway track components, with our own production facilities dedicated to the fabrication of complete railway fastening systems. For over eighteen years, our factory has focused on engineering precision components that ensure secure rail fixation, gauge retention, and long-term track stability, serving railway construction contractors and maintenance departments across more than 160 countries. Our integrated manufacturing capabilities allow us to maintain strict quality control throughout the entire production process, from raw material selection and heat treatment to final assembly and inspection, ensuring every fastening component meets the rigorous demands of modern railway operations worldwide.
Our factory utilizes high-grade steel processed through advanced forging, stamping, and precision machining to achieve optimal clamping force, elasticity, and fatigue resistance. We manufacture complete fastening assemblies including clips, bolts, nuts, washers, and baseplates, configured for various rail sections and sleeper types including concrete, wood, and steel. Each component undergoes rigorous testing to verify tension characteristics, vibration resistance, and long-term durability under dynamic loading conditions. For projects requiring dependable rail fastening systems, we welcome you to contact our team for detailed technical specifications and manufacturing lead times.
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