Joint Bolt M27x160

In heavy-haul railroad infrastructure, the Joint Bolt M27x160 (also known as an M27x160 fish bolt or heavy track bolt) is an ultra-strong structural fastener. Its primary function is to secure the heaviest joint bars (fishplates) that hold heavy sections of railway track together. By tightly clamping these steel components, the M27x160 bolt ensures precise track alignment, continuous load transfer, and structural safety under intense rolling loads.

Technical Specifications: Joint Bolt M27x160

As an established railway fasteners factory, we manufacture the M27x160 track bolt to the highest engineering standards to withstand severe vibrations:

· Product Type: Heavy-Duty Rail Joint Bolt (M27x160)

· Material Composition: Premium High-Strength Carbon Steel / Alloy Steel

· Thread Diameter: 27 mm outer thread

· Total Bolt Length: 160 mm

· Thread Pitch: 3.0 mm (Standard coarse structural thread)

· Unit Weight: Approx. 0.9 kg per piece

· Primary Rail Compatibility: Heavy Mainlines, High-Traffic Freight Routes, R-50, R-65, and R-75 Heavy Rails

Core Engineering & Application Details

1. High-Vibration Fastening Assemblies

To combat continuous dynamic wheel impacts, the Joint Bolt M27x160 is supplied as a complete assembly kit consisting of the threaded track bolt, a matching M27 heavy rail nut, and a high-elasticity spring washer to guarantee zero thread stripping or loosening.

2. Anti-Rotation Head and Neck Configurations

To prevent the bolt from spinning when maintenance crews apply immense hydraulic torque, the bolts are forged with an oval neck (elliptic neck) or diamond neck profile. This geometry locks tightly into the pre-slotted holes of the heavy rail fishplate.

3. Advanced Metallurgical Strength & Materials

Our M27x160 fasteners utilize premium structural steel variants (45# steel), heat-treated through a rigorous quenching and tempering process to achieve structural Grades 8.8, 10.9, or 12.9. Surface anti-rust coatings are available in Plain/Oiled, Black Oxide, Hot-Dip Galvanized (HDG), or Dacromet.

4. Strict Global Regulatory Standards

Our heavy-rail production lines match strict international benchmarks, including GOST 11530-76 / 11530-93 / 11530-2014, alongside DIN, ISO, AREMA, and BS standards.

Frequently Asked Questions (FAQ)

Q: When should a railway project switch from an M24 bolt to an M27x160 joint bolt?
A: The transition occurs when upgrading to high-tonnage mainlines or freight lines carrying massive heavy-haul cars. Heavy rail profiles like R-65 and R-75 require the wider 27mm diameter to absorb higher shear stresses and dynamic wheel impacts.

Q: Why do rail joint bolts feature an oval or diamond neck under the head?
A: It acts as an anti-rotation mechanism. The neck locks into matching elongated slot holes in the fishplate, preventing the bolt from spinning when torque is applied to the nut.

Q: What steel grades are recommended for heavy-duty track bolts?
A: Grades 8.8, 10.9, and 12.9 high-strength steel are highly recommended. These undergo quenching and tempering to withstand massive dynamic wheel loads without shearing.

Q: Which anti-corrosion coating is best for outdoor railway fasteners?
A: Hot-Dip Galvanized (HDG) is excellent for long-term outdoor rust prevention in high humidity. Dacromet offers elite corrosion protection without causing hydrogen embrittlement in high-tensile steel.

Why Source from Signum Rail Fasteners China?

Signum Rail Fasteners China is a world-class railway fasteners factory providing custom solutions tailored to your unique engineering drawings:

· 2-Shift Workforce: Round-the-clock production shifts to deliver high-volume orders in short lead times.

· Strict Quality Control (QC): A high-efficiency QC inspection team monitors every batch to guarantee elite product reliability.

Request a Quick B2B Quote

Looking for a reliable M27x160 joint bolt supplier? Contact Signum Rail Fasteners today to get a rapid, competitive quotation on M27 rail joint bolts.