High Strength Rail Fishtail Bolts

High Strength Rail Fishtail Bolts

High-Strength Fishbolts, also known as rail joint bolts or flange bolts, are critical fastening components engineered for demanding applications, primarily in railway track systems and heavy industrial machinery. These specialized bolts feature an integrated hexagonal head and a flange/washer base, designed to securely connect rail ends or structural flanges under extreme vibrational and load conditions. Our high-grade variants are manufactured to meet and exceed stringent international standards, ensuring unparalleled reliability, durability, and safety for your most critical infrastructure projects.

‌Key Features & Benefits‌

‌Exceptional Mechanical Strength:‌ Manufactured from high-grade alloy or medium carbon steel and subjected to precise heat treatment (quenching and tempering), our bolts achieve performance grades of 8.8, 10.9, and 12.9. This process guarantees superior tensile strength and yield strength, capable of withstanding forces exceeding 1000 MPa for grade 10.9 bolts, making them ideal for high-stress environments. ‌‌

‌Integrated Flange Design:‌ The built-in flange (washer) head provides a larger bearing surface, distributing clamping force more effectively. This design reduces the risk of loosening under vibration, prevents surface damage to the connected materials, and simplifies assembly by eliminating the need for a separate washer. ‌‌

‌Superior Fatigue Resistance:‌ Engineered for the constant dynamic loads and vibrations inherent in rail operations and heavy machinery, these bolts offer excellent fatigue life, minimizing maintenance needs and downtime.

‌Corrosion Resistance Options:‌ Available with various protective coatings (such as hot-dip galvanizing, zinc plating, or dacromet) to provide robust resistance against rust and corrosion, extending service life even in harsh outdoor or chemically aggressive environments.

‌Precision Engineering:‌ Each bolt is produced to exacting dimensional tolerances, ensuring perfect fit and optimal performance in standard rail joint bars and flange connections.