Description
Technical Parameters
Rail Dog Spike Fastening System
The dog spike is a driven rail fastener with a bent head shaped like a dog's ear. Made from mild steel or high-carbon steel, it penetrates timber sleepers to hold the rail base plate or directly clamp the rail foot. Installation requires only a spike maul without pre-drilling. This traditional fastener remains common in heavy-haul, branch line, and yard track applications.
Technical Specifications:
| Parameter | Standard Requirement | Typical Value |
|---|---|---|
| Material grade | Mild or medium carbon steel | Q235B / C45 / A36 |
| Shaft shape | Cross section geometry | Square 14mm x 14mm |
| Shaft length | Below head dimension | 140 – 180 mm |
| Head projection | Offset from shaft center | 12 – 16 mm |
| Hardness range | No heat treatment | 150 – 200 HB |
| Minimum withdrawal | Resistance per spike | 5 – 8 kN |
| Applicable sleeper | Timber only | Hardwood / Softwood |
| Surface finish | Basic protection | Plain black / Oiled / Galvanized |
Installation & Maintenance Perspective:
- Single hammer strike drives spike to correct depth without rotation needed
- No pre-drilling required for most seasoned hard wood sleeper species
- Bent head provides striking surface angled away from rail foot edge
- Over-driving protection by head shape limits penetration beyond target
- Extraction uses standard claw bar applied under bent head shoulder
Maintenance & Operational Perspective
- Shaft taper creates wedging action increasing withdrawal resistance over time
- Square shaft prevents rotation within timber after full driving depth reached
- Rust formation on shaft improves bond with wood fibers naturally
- Annual re-driving restores clamping force lost to timber surface crushing
- Typical service life matches sleeper replacement cycle of 15 to 25 years
Gnee Professional supplier
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