Qingdao Haosail Machinery Co., Ltd.

US Type Clevis Slip Hook 331C/331A Features:

• Clevis Base Design for Rigid, Quick Mounting. At the shank end, the 331C/331A features a U-shaped clevis structure with a precision-drilled hole, a hallmark of US-type rigging hardware. This design enables fast, secure attachment to fixed anchor points (e.g., trailer D-rings, truck bed tie-downs, or shackles) using a cotter pin, hairpin clip, or bolt. The clevis ensures a non-rotating, stable connection, preventing the hook from shifting during load tensioning or transit—critical for maintaining alignment when securing heavy cargo on US highways or job sites.

• "Slip" Hook Geometry for Flexible Chain Adjustment. Unlike grab hooks (which lock onto specific chain links), the 331C/331A’s slip-style throat design allows it to slide freely along the length of compatible chains (typically G70/G80, the US industry standard for transport chains). The throat is wider and smoother, enabling operators to adjust the hook’s position on the chain quickly—even under moderate tension. This flexibility is ideal for scenarios where load sizes vary (e.g., securing pallets, machinery, or bulk goods), as it eliminates the need to disassemble the chain to reposition the hook.

• High-Strength G70-Grade Alloy Steel Construction. Manufactured from heat-treated G70 alloy steel—the gold standard for US heavy-duty load-securing components. The steel undergoes quenching and tempering to boost tensile strength, impact resistance, and wear resistance, allowing the hook to handle working load limits (WLL) ranging from 5,000 to 16,000+ pounds (varies by size). This construction resists deformation, bending, or cracking even under extreme tension (e.g., during highway braking or heavy lifting), meeting the rigorous demands of US DOT and OSHA standards.

US Type Clevis Slip Hook 331C/331A Typical Applications:

• Industrial lifting operation: It is a common accessory for lifting equipment and can be used for the installation, maintenance and handling of various equipment in the factory. For example, in the process of lifting large motors, transformers and other equipment, the lifting chain and the equipment lifting point are connected by sliding hooks, which can facilitate and quickly perform lifting operations, and the chain position can be adjusted to a certain extent to ensure the smooth lifting and precise positioning of the equipment. It can also be used to lift prefabricated components, steel and other building materials at construction sites, and cooperate with cranes, hoists and other equipment to ensure safe and efficient lifting operations.

• Port and railway loading and unloading: In ports, it can be used for auxiliary loading and unloading of containers and lifting of various bulk goods. For example, the sliding hook is used with the chain to lift large mechanical parts, bundles of wood and other goods in the port, which facilitates the transfer of goods between cargo ships and docks. In railway transportation, it can be used to fix and load and unload goods in railway trucks, connect the fixing device in the truck compartment with the chain on the goods to prevent the goods from moving during transportation, and can also be used for loading and unloading railway maintenance equipment, etc.

• Cargo transportation bundling: In the field of road transportation, it is often used to fix goods on transport vehicles such as trucks and trailers. The sliding hook can be hooked on the chain, and then the chain can be passed around the goods and fixed by the U-shaped clip, so that the goods can be firmly bound in the carriage to prevent the goods from being displaced due to bumps during transportation, ensuring transportation safety. For the transportation of some irregularly shaped or large goods, such as mechanical equipment, construction machinery, etc., the sliding hook can flexibly cooperate with chains of different specifications to achieve reliable bundling.

• Traction operation: It can be used to connect the tractor with the towed equipment or vehicle, such as in engineering rescue, to connect the tractor with the faulty vehicle or large mechanical equipment, and tow it to the designated location. In the agricultural field, it can be installed on the tractor to tow agricultural machinery such as planters and harvesters, adapt to complex road conditions in the field, and ensure the stability and reliability of the connection during the towing process.

• Ship operation: It plays a role in the cargo loading and unloading and mooring process of the ship. It can be used to lift the cargo on the ship, cooperate with the lifting equipment on the ship, and lift the cargo from the dock to the ship or from the ship to the dock. At the same time, when the ship is moored, it can be used to connect the mooring chain with the dock mooring device to ensure the stability of the ship when it is moored in the port and resist external forces such as wind and waves.

• Warehousing and logistics: In the warehouse, it is used for the handling and stacking of goods. For example, when using forklifts and other equipment to carry large goods, the sliding hook can be used to fix the chain on the goods, which is convenient for the forklift to lift and carry operations, and improve the loading and unloading efficiency of the stored goods. It can also be used in logistics sorting centers to help fix and organize goods during the transmission and temporary storage of goods, making logistics operations more orderly.