Railroad Track Bolts and Nuts | Chinese Supplier

Railroad track bolts and nuts are highly specialized heavy-duty fasteners critical for holding steel rail segments together at the joints. When sourcing Railroad Track Bolts and Nuts from Chinese manufacturers, you are tapping into the largest railway fastener production base in the world. Signum as one of these Chinese suppliers specializes in high-strength, precision-engineered industrial fasteners compliant with international track standards like AREMA, UIC, DIN, BS, EN, and JIS.

Kunshan Signum Machinery Technology Co., Ltd. Specializes in offering rail track bolts for railway fastening according to our customer's specific requirements. 

Key Technical Characteristics

• The Oval/Diamond Neck: A smooth, domed head transitions down into an oval or diamond-shaped shoulder. This fits perfectly into matching elliptical slots on steel joint bars, preventing the bolt from turning while the nut is heavily torqued.

• Heavy Structural Nuts: These bolts are paired with specialized nuts that have a larger width across the flats (such as heavy square nuts or heavy hex nuts). The added thickness helps distribute clamping pressure and resists stripping under vibration. 

• High-Carbon Strength: Heavy-haul railway infrastructure relies on heat-treated carbon steel fasteners capable of reaching tensile strengths exceeding 110,000 psi to avoid catastrophic structural failure.

Types of Railroad Track Bolts

Classification by Mechanical Neck Shape

The neck shape prevents the bolt from spinning inside the joint bar when the nut is torqued from the opposite side.

• Button Head Oval Neck (BHON) Bolts: The most prevalent track bolt in North America. It features a smooth, dome-shaped head paired with an elongated oval shoulder. The oval neck drops cleanly into alternative elliptical punchings on AREMA standard joint bars.

• Diamond Neck Bolts: Similar to the oval neck style, but uses a sharp, four-pointed diamond shoulder beneath the head to dig securely into heavy commercial joint slots.

• Square Head Track Bolts: Commonly used in older infrastructure or specialized switches. The square shoulder under a flat head prevents spinning or allows a secondary wrench to grip the bolt head itself. 

Classification by Functional Application

Rail lines require distinct fastening systems to clamp joint bars versus pinning steel structures to the wooden or concrete ties underneath.

• Fish Bolts (Joint Bar Bolts): These are the heavy-duty bolts threaded laterally through the web of the rail to bind two rail sections together at a joint bar.

• T-Head Bolts (Clip/Clamp Bolts): Designed with a distinct "T" shaped profile to hook flush into concrete sleeper casting channels or heavy rail fastening clip systems. 

• Anchor & Hook Bolts: Used extensively on railway bridges and elevated structures. They wrap securely around steel structural girders to lock wooden tie bases tightly onto the bridge frame.

• Tunnel Bolts: Highly specialized long-reach curve bolts or square flange bolts tailored with tight thread pitches to anchor tunnel lining assemblies or tight-radius subterranean curves.

Classifications & Specs of Railroad Track Bolts

When purchasing, railroad bolts are forged to adhere strictly to regional engineering bodies: 

• AREMA / ASTM A183: Standard for North American freight and transit corridors.

• UIC / DIN: European metric-profile track standards.