Description
Technical Parameters
Railway Screw Spikes: Product Technical Specifications
| Parameter | Standard Type | High-Strength Type | Insulated Type |
|---|---|---|---|
| Thread Specification | M24 × 130 mm (ISO 403) | M30 × 160 mm (ISO 403) | M24 × 130 mm with nylon sleeve |
| Material Grade | 5.8 Grade Carbon Steel | 8.8 Grade Alloy Steel | 5.8 Grade Steel + PA66 Sleeve |
| Tensile Strength | ≥500 MPa | ≥800 MPa | ≥500 MPa |
| Proof Load | 45 kN | 85 kN | 40 kN |
| Surface Treatment | Hot-dip galvanized (≥55µm) | Zinc-flake coating (≥40µm) | Phosphated + black coating |
| Head Type | Hexagon head (ISO 4017) | Heavy hex head (ISO 4019) | Hex head with insulator cap |
| Torque Setting | 280-320 N·m | 450-500 N·m | 250-280 N·m |
| Working Temperature | -40°C to +120°C | -50°C to +150°C | -40°C to +80°C |
| Corrosion Resistance | Salt spray 480 hours | Salt spray 720 hours | Salt spray 240 hours |
| Standard Compliance | UIC 864-4, EN 13481 | AREMA Ch.4, BS 500 | IEC 61373, EN 50122 |
Railway Screw Spikes: Installation & Maintenance Parameters
| Engineering Phase | Technical Requirement | Quality Control | Failure Indicator |
|---|---|---|---|
| Pre-installation | Sleeper hole tolerance: +0.5/-0 mm | Hole diameter gauge check | Cracked/concrete sleeper damage |
| Thread Preparation | Apply anti-seize compound (zinc-based) | 100% thread coverage visual | Dry installation prohibited |
| Driving Method | Hydraulic torque wrench with adapter | Calibration certificate valid | Impact wrench use prohibited |
| Installation Angle | Perpendicular to sleeper surface (±2°) | Digital angle gauge measurement | Angular deviation >3° |
| Final Torque | ±5% of specified value | Digital torque recorder | Over-torque causing thread strip |
| Re-tightening | After 10,000 ton passage | Track geometry car data | Loosening torque <80% initial |
| Insulation Test | >10 MΩ resistance (500V DC) | Megger test quarterly | Resistance <1 MΩ |
| Wear Inspection | Head height reduction measurement | Annual laser scanning | Height loss >2 mm |
| Removal/Reuse | Maximum 1 reuse cycle | Magnetic particle inspection | Thread deformation visible |
| Replacement Rule | Corrosion depth >0.3mm | Ultrasonic thickness gauge | Stress corrosion cracks found |
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