Description
Technical Parameters
Rail Screw Spike Fastening System
The screw spike is a threaded fastener that rotates into a plastic or wooden dowel pre-installed in concrete sleepers. It features a square or hexagonal head for wrench application and a tapered threaded shank. Made from heat-treated carbon steel, it provides both clamping force and pull-out resistance. It is standard for concrete sleeper track systems worldwide.
Technical Specifications:
| Parameter | Standard Requirement | Typical Value |
|---|---|---|
| Material grade | Medium carbon steel | C45 / 1045 / 40Cr |
| Heat treatment | Quenched and tempered | 25 – 35 HRC |
| Thread type | Coarse pitch | ISO metric or UNC |
| Thread diameter | Major dimension | 20 mm – 24 mm |
| Thread length | Engaged portion | 40 mm – 60 mm |
| Head type | Wrench interface | Square 22mm / Hex 24mm |
| Pull-out strength | Minimum resistance | 30 kN – 50 kN |
| Plastic dowel type | Pre-installed sleeve | Nylon 6 / Polyamide |
Installation & Maintenance Perspective:
- Pre-installed plastic dowel receives screw spike without damaging concrete threads
- Calibrated torque wrench ensures correct clamping force each installation
- No hammer impact means zero risk of concrete sleeper cracking around hole
- Thread lubricant reduces friction allowing consistent torque application
- Power tool installation achieves 100 to 150 spikes per hour per worker
Maintenance & Operational Perspective
- Thread engagement length of 40mm provides pull-out resistance exceeding 30kN
- No loss of clamping force from wood shrinkage or fiber crushing over time
- Withdrawal resistance remains constant throughout concrete sleeper service life
- Thread crests cold-form plastic dowel creating tight interference fit
- Resists loosening from vibration better than any driven fastener type
Gnee Professional supplier
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