Qingdao Haosail Machinery Co., Ltd.

Features of US Type Dee Shackle

• Strict American standards, high load limit: following the ASME B30.26 standard, it must pass a static load test of 2 times the rated load and a dynamic load test of 1.33 times the rated load, and the breaking load is more than 6 times the working load (100-ton shackle breaking load ≥ 600 tons), and is safer than European shackles under extreme working conditions (such as sudden overload).

• Integral forging, strong impact resistance: The D-ring and pin shaft are all made of integral forging technology (no welding), and are tempered and heat treated (hardness HB220-260), with impact toughness ≥ 40J (at low temperature of -40℃), which is 40% higher than the impact resistance of the casting type, and is suitable for dynamic load scenarios (such as oil field drilling platform hoisting).

• Reliable anti-loosening and efficient operation: The anti-loosening method of the pin shaft is mainly "nut + cotter pin", and some heavy-duty models use "bolt + self-locking nut". The probability of anti-loosening failure in high-frequency vibration environments (such as mining machinery) is ≤0.05%; the ends of the pin shafts are mostly round or hexagonal heads, suitable for fast loading and unloading with standard wrenches, and one person can complete the installation within 1 minute.

• The material is corrosion-resistant and suitable for extreme environments: the carbon steel model is hot-dip galvanized (zinc layer thickness ≥100μm) or phosphating, and the salt spray resistance test is ≥1200 hours; the 316 stainless steel model PREN (pitting resistance equivalent) is ≥48, and the corrosion rate is ≤0.008mm/year in strong corrosion environments such as offshore oil platforms, and the life is 15%-20% longer than the European 316 model.

• Wide structure, outstanding compatibility: The width of the D-shaped ring is 10%-15% wider than that of the European shackle (e.g. 50-ton American shackle is 120mm wide, while European shackle is about 105mm), and the thickness of the ring body is increased by 20%, which is compatible with large-diameter wire ropes (≥32mm) and American chains (e.g. G80 grade), and no adapter is required in heavy-duty connections.

US Type Dee Shackle Applications

• Energy and heavy industry: Drill pipe hoisting of oil drilling platforms, suitable for 100-200 ton American D-type shackles, 4130 alloy carbon steel material to withstand high pressure environment underground; large equipment (such as scraper conveyors) in coal mines, coarse thread design of pin shafts for quick connection, improving underground operation efficiency.

• Ships and ocean transportation: Container ship hoisting in North American ports, 50-ton shackles connect crane slings and container corner fittings, and the wide D-shaped ring structure is suitable for containers of different specifications; anchor chain fixing of ocean-going cargo ships, 316 stainless steel type resists seawater corrosion and ensures long-term navigation safety.

• Infrastructure and lifting engineering: hoisting of prefabricated beams of highway bridges in the United States (such as 100-ton T-beams), the integral forged ring body withstands high-strength loads; large crane main arm connection, pin shaft anti-loosening design resists the impact force generated by the swing of the boom.

• Special vehicles and logistics: Cargo securing of heavy trailers in North America, 20-30 ton shackles with chains to lock construction machinery, coarse threads are not easy to loosen under bumpy road conditions; rocket parts transportation in the aerospace field, high-precision American shackles (tolerance ≤ 0.05mm) to ensure stable lifting.