Description
Technical Parameters
Rail Dog Spike Fastening System
The Railway Dog Spike is a hot-forged steel drive fastener with an L-shaped profile, engineered to secure flat-bottom rail to timber sleepers. The tapered square shank compresses wood fibers during driving, creating frictional retention without mechanical threads. The offset head functions as both striking surface and rail-bearing shoulder, providing reliable service for branch lines, industrial sidings, and heritage railways .
Technical Specifications:
| Parameter | Specification | Performance Indicator |
|---|---|---|
| Manufacturing Method | Hot-forged from billet | Grain follows L-shaped contour |
| Material Grade | Low-carbon steel | ASTM A65 compliant |
| Nominal Length | 5.5 to 6.5 inches | 140–165 mm |
| Shank Section | Square | 5/8" × 5/8" typical |
| Withdrawal Resistance | Initial installation | 2,000–4,000 lbs |
| Service Life | Well-maintained timber tie | 25–40 years |
Installation & Maintenance Perspective:
- Controlled cooling after forging prevents internal stresses that would cause warping or cracking during service .
- The head-to-shank radius is formed without folds or laps that would create stress risers susceptible to fatigue .
- Surface decarburization is minimized through controlled furnace atmosphere, maintaining surface hardness for wear resistance .
Maintenance & Operational Perspective
- The square shank creates four-point fiber compression zones that maximize frictional engagement with surrounding wood .
- The offset head transfers lateral rail loads directly to the shank without creating bending moments that would distort the spike .
- Multiple spikes per rail seat share lateral loads, providing system redundancy if individual fasteners loosen .
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