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Castle nuts, also known as castellated nuts or slotted nuts, are specialized fasteners designed to prevent loosening in various applications. Featuring distinct notches or slots along their circumference, castle nuts are commonly paired with a cotter pin to secure screws and bolts effectively. In the railway system, slotted nuts are core anti-loosening fasteners primarily used in critical components subjected to high-frequency vibrations and heavy loads (such as high-speed rail bogies, rail fasteners, and locomotive parts).
Slotted Body
Slotted Hex Nuts feature six slotted sides to allow a cotter pin to freely pass through its body.This style of fastener is also designed to be used with a bolt, screw, or stud that has received a hole drilled through its threads.
Locking Action Capabilities
Once the Slotted Hex Nut has been tightened, a cotter pin is then inserted through one of the open slots on the Hex Nut, and through the drilled hole on the bolt, screw, or stud. This is done to lock the assembly in place and prevent the nut from spinning free or loosening within its application.
Vibration Resistance for Stable Operation
Engineered for the continuous vibration environment of railway tracks (frequency: 50Hz), our slotted hex nuts completely solve this challenge through a physical locking mechanism. The special slotted structure, used in conjunction with cotter pins, forms a dual anti-loosening system that secures critical connection points against loosening. This effectively prevents nut detachment caused by vibration, ensuring the stable operation of key equipment such as turnout systems and braking systems.
High Wear & Corrosion Resistance, Suitable for Complex Outdoor Scenarios
Railway environments are complex and variable, with exposure to humidity, salt spray (for coastal railways), and chemicals (deicing agents) being common. We offer multiple surface coating options, including galvanizing, dacromet, and hot-dip galvanizing. Among them, the dacromet coating provides over 1,000 hours of salt spray protection in marine atmospheric environments, effectively resisting chloride ion corrosion.
Easy Installation & Maintenance
The hexagonal shape allows operation with common tools, while the slotted design enables tightening or disassembly with only a 60-degree wrench rotation in narrow spaces, improving work efficiency. In confined locomotive areas (such as locomotive engine compartment maintenance), the slotted structure reduces wrench installation time by 25%. Maintenance teams can complete 2 additional equipment inspection points per day, increasing overall efficiency by 30% and significantly reducing train downtime windows.
Widely Used in Safety-Critical Key Vibrating Components
Key components of railway locomotives: Fastening of core load-bearing and control parts such as bogeys, traction devices, and braking systems.
Connection parts of rail vehicles: Key nodes requiring vibration resistance and anti-loosening, such as axle connections and car body suspensions.
Reinforcement parts of railway bridges: Structural components requiring high-strength load-bearing capacity, such as bridge bearing anchoring and expansion joint fixing.
Catenary support parts: Fastening in outdoor open-air scenarios, such as catenary support bases and arm connections.
Other Applicable Fields: Rail transit, heavy machinery, port equipment, wind power equipment and other scenarios with high requirements for fastening strength, vibration resistance and weather resistance.
Can this product be compatible with non-standard bolts of railway mechanical equipment?
Customization service is supported. If your equipment uses non-standard bolts, please provide the bolt's specifications and parameters (such as diameter, pitch, length, etc.), and we will conduct targeted R&D and production to ensure the product is perfectly compatible. Meanwhile, we guarantee that the core performance complies with railway industry standards.
Do special tools need to be used for installation?
No. The slotted design is compatible with standard wrenches. After training, workers can complete the installation within 5 minutes, which is 25% faster than traditional nuts.
Can this product be used in other fields besides the railway system?
In addition to the railway system, this product is also suitable for rail transit, heavy machinery, port equipment, wind power equipment and other fields with high requirements for fastening strength, vibration resistance and weather resistance. For usage scenarios in different fields, please contact us to obtain targeted selection recommendations.
What is the delivery lead time for bulk purchases?
For bulk purchases of standard specification products (1,000 units and above), the delivery lead time is 7-10 working days; for customized products, the delivery lead time is 15-30 working days depending on the complexity of the requirements.
Castle nuts, also known as castellated nuts or slotted nuts, are specialized fasteners designed to prevent loosening in various applications. Featuring distinct notches or slots along their circumference, castle nuts are commonly paired with a cotter pin to secure screws and bolts effectively. In the railway system, slotted nuts are core anti-loosening fasteners primarily used in critical components subjected to high-frequency vibrations and heavy loads (such as high-speed rail bogies, rail fasteners, and locomotive parts).
Slotted Body
Slotted Hex Nuts feature six slotted sides to allow a cotter pin to freely pass through its body.This style of fastener is also designed to be used with a bolt, screw, or stud that has received a hole drilled through its threads.
Locking Action Capabilities
Once the Slotted Hex Nut has been tightened, a cotter pin is then inserted through one of the open slots on the Hex Nut, and through the drilled hole on the bolt, screw, or stud. This is done to lock the assembly in place and prevent the nut from spinning free or loosening within its application.
Vibration Resistance for Stable Operation
Engineered for the continuous vibration environment of railway tracks (frequency: 50Hz), our slotted hex nuts completely solve this challenge through a physical locking mechanism. The special slotted structure, used in conjunction with cotter pins, forms a dual anti-loosening system that secures critical connection points against loosening. This effectively prevents nut detachment caused by vibration, ensuring the stable operation of key equipment such as turnout systems and braking systems.
High Wear & Corrosion Resistance, Suitable for Complex Outdoor Scenarios
Railway environments are complex and variable, with exposure to humidity, salt spray (for coastal railways), and chemicals (deicing agents) being common. We offer multiple surface coating options, including galvanizing, dacromet, and hot-dip galvanizing. Among them, the dacromet coating provides over 1,000 hours of salt spray protection in marine atmospheric environments, effectively resisting chloride ion corrosion.
Easy Installation & Maintenance
The hexagonal shape allows operation with common tools, while the slotted design enables tightening or disassembly with only a 60-degree wrench rotation in narrow spaces, improving work efficiency. In confined locomotive areas (such as locomotive engine compartment maintenance), the slotted structure reduces wrench installation time by 25%. Maintenance teams can complete 2 additional equipment inspection points per day, increasing overall efficiency by 30% and significantly reducing train downtime windows.
Widely Used in Safety-Critical Key Vibrating Components
Key components of railway locomotives: Fastening of core load-bearing and control parts such as bogeys, traction devices, and braking systems.
Connection parts of rail vehicles: Key nodes requiring vibration resistance and anti-loosening, such as axle connections and car body suspensions.
Reinforcement parts of railway bridges: Structural components requiring high-strength load-bearing capacity, such as bridge bearing anchoring and expansion joint fixing.
Catenary support parts: Fastening in outdoor open-air scenarios, such as catenary support bases and arm connections.
Other Applicable Fields: Rail transit, heavy machinery, port equipment, wind power equipment and other scenarios with high requirements for fastening strength, vibration resistance and weather resistance.
Can this product be compatible with non-standard bolts of railway mechanical equipment?
Customization service is supported. If your equipment uses non-standard bolts, please provide the bolt's specifications and parameters (such as diameter, pitch, length, etc.), and we will conduct targeted R&D and production to ensure the product is perfectly compatible. Meanwhile, we guarantee that the core performance complies with railway industry standards.
Do special tools need to be used for installation?
No. The slotted design is compatible with standard wrenches. After training, workers can complete the installation within 5 minutes, which is 25% faster than traditional nuts.
Can this product be used in other fields besides the railway system?
In addition to the railway system, this product is also suitable for rail transit, heavy machinery, port equipment, wind power equipment and other fields with high requirements for fastening strength, vibration resistance and weather resistance. For usage scenarios in different fields, please contact us to obtain targeted selection recommendations.
What is the delivery lead time for bulk purchases?
For bulk purchases of standard specification products (1,000 units and above), the delivery lead time is 7-10 working days; for customized products, the delivery lead time is 15-30 working days depending on the complexity of the requirements.
