Rail Joint Bolt for Rail S-49 

For S-49 rail (also known as 49E1 rail), rail joint bolts—commonly called fishbolts—are standardized to match the specific hole diameters of the S-49 fishplate and rail web. Because S-49 is a European DIN/EN standard rail profile, these fasteners typically follow metric specifications. 

Technical Specifications for S-49 Joint Bolts

S-49 rail joint bolts are designed to fit the 30mm bolt holes found in the S-49 rail profile.

Key Hardware Components

• Fishplate Compatibility: These bolts are used with 4-hole or 6-hole fishplates specifically designed for S-49.

• Expansion Allowance: The holes in the rail are typically drilled slightly larger (30mm for a 24mm bolt) to allow the rail to expand and contract without shearing the bolts.

• Strength & Safety: In safety-critical mainline applications, Grade 10.9 bolts are preferred due to their high tensile strength (≥1000 Mpa). They are often paired with heavy hex nuts and high-tension spring washers to prevent loosening caused by train vibration. 

Signum Rail Fasteners specializes in high-tensile joint bolts for S-49 and UIC-profile rails. We primarily supply M24 fishbolts in Grade 8.8 and 10.9, ensuring they meet strict EN standards for vibration resistance and shear strength. If you’re looking for a supplier who can provide the complete assembly—bolts, heavy hex nuts, and double-coil washers—with short lead times, I’d love to send you a quote.