24x150 Screw Spike Grade 5.6 (35K Material) with Flat Washer HDG – Railway Fastener
Product Overview
Our 24x150 Screw Spike Grade 5.6 is a professional railway fastener, precisely manufactured with 35K carbon steel (35# steel) and paired with a flat washer, featuring hot-dip galvanized (HDG) surface treatment. With a fixed size of 24mm diameter and 150mm length, and grade 5.6 strength, this screw spike is engineered for railway track fastening, used to secure rails, sleepers, and rail clips tightly. The screw thread design enhances anchoring force, while the flat washer prevents loosening under long-term vibration. Strictly compliant with railway fastener standards, it provides stable, corrosion-resistant, and long-lasting performance for railway track construction and maintenance.
Problem Statement
In railway track operation, the stability of fasteners directly affects driving safety. Ordinary straight-thread spikes have weak anchoring force, making them prone to loosening under continuous train vibration, leading to rail displacement and potential safety hazards. Inferior materials (non-35K steel) and low-grade (below 5.6) spikes are prone to bending, breaking, or thread slipping under heavy load. Without matching flat washers, the fastening tightness is insufficient, and lack of HDG finish results in rapid rust corrosion in outdoor, rainy, or coastal railway environments—greatly increasing maintenance frequency, replacement costs, and even causing unplanned railway downtime.
Engineering Solution
Our 24x150 Screw Spike Grade 5.6 (35K Material) with Flat Washer HDG perfectly addresses these challenges. 35K carbon steel (high-quality medium carbon steel) and grade 5.6 strength ensure excellent toughness and load-bearing capacity, resisting bending and breaking. The unique screw thread design increases contact area with sleepers, enhancing anchoring force and preventing displacement under vibration. The matched flat washer provides elastic preload, effectively preventing loosening during long-term train operation. Hot-dip galvanized (HDG) finish forms a thick, uniform protective layer, achieving superior corrosion and rust resistance, adapting to outdoor, humid, and coastal railway environments. The fixed 24x150 size ensures perfect matching with standard railway sleepers and rail accessories, reducing installation time and improving construction efficiency.
Technical Specifications
| Parameter |
Details |
| Product Name |
24x150 Screw Spike with Flat Washer |
| Model Size |
24mm (diameter) * 150mm (total length) |
| Material |
35K Carbon Steel (35# Steel) |
| Strength Grade |
Grade 5.6 |
| Surface Finish |
Hot-Dip Galvanized (HDG), zinc layer thickness ≥80μm |
| Matching Accessory |
Flat Washer (matched size, anti-loosening) |
| Production Process |
Hot Forging, CNC Threading, Heat Treatment, HDG Coating |
| Standard |
Railway Fastener Industry Standard |
| Tensile Strength |
≥560 MPa (Grade 5.6) |
| Hardness |
140-180 HRC |
| Key Features |
Anti-loosening, Corrosion-Resistant, High Anchoring Force, Vibration Resistant |
| MOQ |
Negotiable (bulk orders preferred) |
| Lead Time |
7-15 days (stock available for standard specifications) |
| Certification |
ISO 9001, SGS, Railway Fastener Qualification Certificate |
Applications
- Railway track fastening: used to fix rails, rail clips, and sleepers (wooden, concrete sleepers) in main railway lines, suburban railways, and industrial railways
- Railway maintenance: replacement of old, damaged screw spikes in existing railway tracks to restore fastening stability
- Railway construction: new railway line laying, including high-speed railway auxiliary lines, freight railway, and urban rail transit
- Industrial railway: fastening of rails in factory workshops, mining railways, and port railway yards
- Outdoor railway infrastructure: railway bridges, tunnels, and coastal railway sections (HDG finish adapts to harsh environments)
How It Works
The 24x150 screw spike adopts a screw thread structure, which is driven into the pre-drilled hole of the sleeper (wooden or concrete) by professional tools. The screw thread increases the friction and anchoring force between the spike and the sleeper, preventing the spike from slipping or displacing under train vibration. The flat washer is sleeved on the spike rod before installing the nut. The hot-dip galvanized (HDG) surface layer isolates the 35K steel body from air, moisture, and harmful substances, avoiding oxidation and rust, ensuring long-term stable fastening performance in outdoor and harsh environments.
Selection Guide
- Confirm Size Matching: The 24x150 size is a standard railway screw spike specification, suitable for most conventional sleepers. Confirm the sleeper thickness and pre-drilled hole diameter to ensure the spike length and diameter match (24mm diameter, 150mm total length is fixed for direct selection)
- Strength Grade Confirmation: Grade 5.6 is the standard grade for ordinary railway fasteners, suitable for general railway lines (freight, suburban railways). For high-speed or heavy-load railway sections, we can provide higher-grade options (contact us for customization)
- Surface Finish Selection: Hot-dip galvanized (HDG) is the default finish for outdoor railway use, with superior corrosion resistance. For indoor industrial railway (dry environment), we can provide black oxide finish (customizable)
- Accessory Matching: Must use the matched flat washer (provided with the spike) to ensure anti-loosening effect; match with standard nuts of corresponding size to avoid thread mismatch
Frequently Asked Questions
Is the 24x150 screw spike paired with Flat washer by default?
Yes, each 24x150 screw spike is paired with a matching flat washer by default, ensuring perfect fit and anti-loosening performance. We can also provide additional spring washers for backup if needed.
Why choose 35K material for the screw spike?
35K carbon steel (35# steel) is a medium carbon steel with excellent toughness and mechanical strength, which is more suitable for railway fasteners than ordinary low-carbon steel. It can resist bending and breaking under heavy load and vibration, ensuring long-term service life.
What is the service life of the HDG finish screw spike?
The hot-dip galvanized (HDG) finish has a zinc layer thickness of ≥80μm, which can effectively resist corrosion and rust. In outdoor railway environments, the service life can reach 10-15 years, greatly reducing maintenance and replacement costs.
Do you have stock for 24x150 grade 5.6 screw spikes?
Yes, we have sufficient stock for the standard 24x150 screw spike (35K material, grade 5.6, HDG with flat washer). Bulk orders can be delivered within 7-10 days, and urgent orders can be expedited.
Can you provide customization for non-standard sizes or grades?
Yes, we support OEM/ODM customization. We can adjust the size (diameter, length), strength grade (higher than 5.6), material, and surface finish according to your project requirements. Submit your drawings or specs for a customized quote.
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