Screw Spike Rail Fastening Systems

The screw spike is also known as rail screw. As one kind of Rail spike, it is a metal screw for fixing rail fasteners. Screw spike is usually made of NO.3 steel. Because its nail rod surface has thread, so it is called screw spike. The pull-out resistance is 0.5 ~ 1.0 times larger than that of common rail spike, but the thrust resistance is 50% less. Due to disassembly and assembly inconvenience, it is difficult to adjust the rail gauge, which is generally used on the railway turnout.For meeting various needs of clients, we can offer coach screws, stud screw, railway sleeper screws and other coustom screw spike in railway.

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Description

Technical Parameters

↵Rail Screw Spike Fastening System

Railway Screw Spike For Railway Fastening System

The Railway Screw Spike represents an intermediate-generation mechanical fastening technology designed to overcome the limitations of driven dog spikes through threaded engagement with timber sleepers. Characterized by its square or hexagonal head, coarse-threaded shank, and hardened steel composition, this fastener creates secure mechanical interlock through combined thread bearing and frictional resistance.

Technical Specifications:

Parameter	Category	Specification / Characteristic
Material Standard	Manufacturing	ASTM A449 or equivalent, typically C45/1045 medium-carbon steel
Thread Specification	Design	Acme thread profile, 4-6 threads per inch depending on diameter
Heat Treatment	Manufacturing	Selective induction hardening of threads to 35-40 HRC
Corrosion Protection	Durability	Hot-dip galvanized per ASTM A153, 85-100 μm coating thickness
Standard Sizes	Design	3/4", 7/8", 1" shank diameters, 6-8" lengths depending on application

Mechanical & Installation Perspective

Thread-Enhanced Load Transfer: The coarse Acme-style threads provide 300-400% greater pull-out resistance compared to smooth-shank dog spikes through combined thread shear strength and enlarged bearing surface area within timber fibers.

Controlled Pre-tension Capability: Torque-controlled installation enables precise clamping force application (typically 100-150 Nm for standard spikes), creating consistent baseplate pressure that maintains rail-seat integrity under dynamic loading.

Vibration Resistance Mechanism: The threaded engagement creates mechanical locking action that resists back-rotation, reducing maintenance frequency by 70-80% compared to driven spikes in similar service conditions.

Installation, Maintenance & System Integration Perspective

Precision Thread Manufacturing: Produced through hot or cold thread rolling processes that create work-hardened thread surfaces with Rockwell hardness 25-30% greater than the base material, significantly enhancing wear resistance.
Installation Protocol Requirements: Mandates pre-drilling with specialized auger bits sized to 75-80% of spike root diameter, creating optimal thread engagement while preventing timber splitting during installation.
Torque-Calibrated Installation: Requires calibrated impact wrenches or torque multipliers achieving installation accuracy within ±10% of specified torque values, with verification through painted witness marks or digital torque recording.