Anchor Bolt M22x175

In modern railroad engineering, the Rail Anchor Bolt M22x175 (also called a concrete sleeper anchor bolt, foundation bolt, or railway anchor screw) is a critical high-strength fastener. Unlike shorter clamp bolts, this extended 175mm heavy-duty bolt embeds deeply into concrete sleepers, ballastless track beds, slabs, or turnouts. It provides an immovable anchoring point that withstands the severe pulling and shearing forces generated by heavy freight and high-speed trains.

Technical Specifications: M22x175 Rail Anchor Bolt

Manufactured to survive extreme vertical loads and harsh outdoor weathering, our M22x175 concrete track anchors conform to strict engineering parameters:

· Product Designation: Heavy-Duty Rail Anchor Bolt (M24 major head / M22 outer thread)

· Material Matrix: Premium High-Strength Carbon Steel / Structural Alloy Steel

· Thread Profile: M22 metric outer thread

· Total Shank Length: 175 mm (Extended length for deep concrete embedding)

· Thread Pitch: 2.5 mm coarse thread (Optimized for maximum high-torque retention)

· Standalone Bolt Weight: Exactly 0.635 kg per piece

· Standalone Nut Weight: Exactly 0.126 kg per piece

· Bolt Manufacturing Standard: GOST 16017-2014

· Nut Manufacturing Standard: GOST 16018-2014

· Primary System Compatibility: Ballastless Track Slabs, Concrete Sleepers, Rail Baseplate Foundations, and heavy transit switch assemblies

Core Engineering & Application Details

1. High-Tensile Slab Track Foundations

The M22x175 anchor bolt functions as the structural backbone of ballastless concrete-slab track systems. Placed deep within pre-cast or cast-in-place concrete sleepers, its extended length guarantees massive pull-out resistance, ensuring that rail baseplates remain immovably attached to the foundation beneath.

2. Vibrational and Thermal Stress Resistance

Passing rolling stock exerts immense dynamic loads, while outdoor track environments suffer from extreme thermal expansion and contraction. Forged from premium carbon or alloy structural steel and treated via a precise quenching and tempering cycle, our anchor bolts achieve exceptional tensile limits (Grades 8.8, 10.9, or 12.9) to prevent fatigue-induced cracking under heavy axle loads.

3. Global Regulatory Compliance & Anti-Corrosion

Our production lines match strict international track benchmarks, including GOST 16017-2014 and GOST 16018-2014, alongside equivalent European UIC and AREMA standards. Because anchor bolts sit embedded where moisture accumulates, we offer elite protective coatings, including Hot-Dip Galvanized (HDG), Black Oxide, and Dacromet to completely prevent rust degradation.

Custom Rail Bolt Manufacturing: Engineered to Client Drawings

Every track infrastructure layout presents unique geological and structural challenges. As a premier railway fasteners factory, Signum Rail Fasteners China specializes in custom manufacturing to fit your precise layout constraints. We can fully customize rail bolts according to clients' unique requirements and engineering drawings.

Whether your project requires specific anchor geometries (such as L-shaped, J-shaped, straight, or curved ends), non-standard shank adjustments, or unique high-tensile material matrix configurations, our facility handles complete product tailoring with elite precision.

Uncompromised Quality Assurance & Third-Party Inspection

To ensure ultimate structural safety on the tracks, we strictly welcome and accept third-party quality inspections before shipment. Clients are fully encouraged to appoint independent international testing agencies (such as SGS, TÜV, or Intertek) to verify thread tolerances, hardness ratings, and tensile strength bounds. This robust external validation guarantees that every single batch leaves our factory floor meeting the highest product reliability benchmarks.

Frequently Asked Questions (FAQ)

Q: What is the main difference between an M22x75 clamp bolt and an M22x175 rail anchor bolt?
A: The difference lies in application and length. An M22x75 clamp bolt is a short fastener used above ground to clamp the rail edge to the baseplate. An M22x175 anchor bolt is much longer, locking the entire baseplate assembly into the deep concrete sleeper or track foundation.

Q: Why is Dacromet coating preferred for high-tensile railway anchor bolts?
A: High-strength steel bolts (Grades 10.9 and 12.9) are highly susceptible to hydrogen embrittlement during standard acid pickling and electro-galvanizing. Dacromet provides elite corrosion resistance through a non-electrolytic process, entirely eliminating this structural risk.

Why Source from Signum Rail Fasteners China?

Choosing Signum Rail Fasteners China ensures you are partnering directly with a world-class manufacturing facility focused on premium B2B execution:

· 2-Shift Workforce: Our manufacturing facility operates round-the-clock production shifts to handle high-volume industrial or mainline transit demands with minimized lead times.

· Strict Quality Control (QC): A high-efficiency QC inspection team monitors every batch—from raw steel billet processing and custom thread forging to ultrasonic flaw testing—guaranteeing elite structural reliability.

Request a Technical B2B Quote

Looking for a reliable track hardware supplier or need a custom solution built to your engineering diagrams? Contact Signum Rail Fasteners today to get a rapid, competitive quotation on standard and custom-manufactured M22x175 rail anchor bolts.