Description
Technical Parameters
Railway Fish Plates: Product Technical Specifications
| Parameter | Standard Fish Plate | Compromise Fish Plate | Insulated Fish Plate |
|---|---|---|---|
| Rail Joint Type | Same section rail joint | Different section rail joint | Insulated block joint |
| Material Grade | 900A Steel (EN 10025) | 700MC Steel (EN 10149) | S355J2 + Polyamide Insulator |
| Standard Length | 600 mm (4-hole) / 800 mm (6-hole) | 900 mm (6-hole tapered) | 600 mm (4-hole insulated) |
| Bolt Hole Diameter | 26 mm ± 0.5 mm | 26 mm (large end) / 24 mm (small end) | 26 mm (steel) / 28 mm (insulated) |
| Surface Finish | Shot blasted + primer paint | Hot-dip galvanized (≥85μm) | Epoxy coating + insulated sleeves |
| Yield Strength | ≥ 690 MPa | ≥ 550 MPa | ≥ 355 MPa |
| Impact Toughness | 27 J @ -20°C (Charpy V) | 40 J @ -40°C (Charpy V) | 27 J @ -20°C (steel part) |
| Weight per Set | 22 kg (600 mm) / 29 kg (800 mm) | 34 kg (900 mm tapered) | 25 kg (600 mm insulated) |
| Standard Compliance | UIC 864, EN 13674-4 | AREMA Ch.4, IRCA Spec. | IEC 61373, EN 50122 |
Railway Fish Plates: Engineering Application & Inspection Standards
| Application Context | Installation Specification | Inspection & Maintenance | Failure Criteria |
|---|---|---|---|
| Joint Bar Alignment | Gap ≤ 1 mm between rail ends | Feeler gauge check monthly | Gap > 3 mm or vertical misalignment |
| Bolt Torque Sequence | Cross-tightening pattern, 300-350 N·m | Ultrasonic bolt tension test annually | Torque loss > 15% of initial |
| Thermal Expansion Zone | Allow ±15 mm rail movement | Seasonal gap measurement | Fish plate binding on rail web |
| Electrified Track Joint | Bonding cable ≥ 70 mm² copper | Resistance < 0.05 Ω per joint | Voltage drop > 5% across joint |
| Welded Rail Breathing Zone | Lubricated contact surfaces | Friction coefficient check biannually | Galling or seizure observed |
| Fatigue Monitoring | Dye penetrant test every 2 years | Crack detection at bolt holes | Crack length > 5 mm from hole |
| Insulated Joint Integrity | 1000 V megger test after installation | Quarterly insulation resistance check | Resistance < 1 MΩ in wet condition |
| Corrosion Protection | Re-grease annually (coastal zones) | Coating adhesion test per ISO 2409 | Base metal corrosion > 10% area |
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