Description
Technical Parameters
Rail Screw Spike Fastening System
The Railway Screw Spike is a precision-threaded fastener engineered for securing rail anchor plates to timber sleepers in heavy-haul track systems. Manufactured from heat-treated alloy steel, it converts rotational torque into linear clamping force through continuous helical engagement. This spike resists vibrational loosening and allows selective replacement without sleeper damage. Its threaded design delivers consistent, measurable preload for reliable track geometry retention.
Technical Specifications:
| Parameter | Specification |
|---|---|
| Product Designation | Railway Screw Spike – Threaded Track Fastener |
| Material Specification | 4140 / 42CrMo4 / 40Cr Alloy Steel |
| Tensile Strength | ≥ 850 MPa (123,000 psi) minimum |
| Yield Strength | ≥ 700 MPa (101,500 psi) minimum |
| Elongation | 12% minimum in 2 inches |
| Thread Standard | Unified Coarse (UNC) or ISO metric coarse |
| Length Range | 150 mm – 250 mm (6 – 10 inches) |
| Diameter Options | 16 mm, 19 mm, 22 mm (5/8", 3/4", 7/8") |
Installation & Maintenance Perspective:
- Clamping force correlates directly with applied installation torque value.
- Friction variations cause tension scatter of plus or minus thirty percent.
- Torque-angle monitoring detects cross-threading or bottoming out.
- Lubricated threads require reduced torque for equal clamping force.
- Field verification uses torque wrench to check residual tension.
Maintenance & Operational Perspective
- Thread friction alone prevents loosening under dynamic track loads.
- Prevailing torque features add locking without special tools.
- Embedment relaxation reduces preload during initial service period.
- No supplemental locking devices required for normal operation.
- Loosening occurs only if thread friction is completely overcome.
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