The Alloy Steel Durable Screw Pin Shackle for Rigging stands as a cornerstone in heavy-duty lifting and load-securing operations, engineered to excel in the most demanding industrial and maritime environments.
The Alloy Steel Durable Screw Pin Shackle serves as a critical connection point for demanding marine, construction, mining, and energy lifting operations. Engineered from heat-treated Grade 80 alloy steel (Q690/35CrNiMo). Designed for heavy load management, it offers a Working Load Limit (WLL) ranging from 2-50 tons across 3/8"-3" diameter profiles, strictly adhering to a 6:1 safety factor where the breaking load remains ≥6×WLL. The architecture features a fully threaded pin machined to thread grade 6g tolerances, enveloped in a thick HDG coating that provides a distinct, tactile matte finish. Each unit is permanently laser-etched with its specific WLL, grade, diameter, corporate logo, and batch number for uncompromising traceability.
When operating in aggressive oceanic climates, this hardware reliably secures 20-50 ton containers directly to ship decks. The specialized HDG coating guarantees a 15-year offshore life, resisting the constant, corrosive bite of salt spray. For subsea infrastructure, it securely anchors 10-15 ton underwater cables to the seabed, engineered to withstand immense crushing forces up to 10MPa pressure. Above the surface, rigging crews use it to connect 30-40 ton precast piles to crane hooks even amidst punishing 15m/s winds; the precision-milled hexagonal nut ensures that heavy wrenches maintain a solid, slip-free grip despite heavy salt accumulation.
Urban development requires absolute predictability. This shackle effortlessly lifts 20-30 ton steel columns for high-rises and maneuvers massive 40-50 ton concrete beams for bridge construction via heavy-duty cranes. The resilient HDG coating actively repels abrasive construction dust and acidic rain, maintaining a clean, 6-month rust-free surface even when stored in open yards. During power station assembly, it safely lifts 15-25 ton boiler components.
Advanced Thermal Processing: Undergoes meticulous heat treatment (880-920℃ quenching followed by 550-600℃ tempering) to achieve 800-900MPa tensile strength, 640-720MPa yield strength, and ≥12% elongation.
Precision Manufacturing Craftsmanship: Utilizes an advanced integral forging process with a 3:1 reduction ratio, effectively eliminating internal voids and ensuring structural integrity alongside highly consistent dimensional tolerances.
Flaw Detection: Subjected to strict 100% MPI (Magnetic Particle Inspection per ASTM E709) to detect even microscopic surface flaws, guaranteeing absolute reliability under load.
Galvanized Defense: The heavy-duty HDG coating (85-100μm) utilizes 99.95% pure zinc, creating a protective barrier that lasts 5-8 times longer than standard electro-galvanizing.
Maintenance Synergy: The precisely cut threads are fully compatible with lithium grease, providing a smooth, satisfying tactile rotation during manual pin maintenance and installation.
Exceeding Baselines: The strict 6:1 safety factor significantly outperforms the standard ASME B30.26 4:1 requirement, offering superior operational peace of mind.
Lifecycle Traceability: Permanent laser markings allow for full traceability. We execute rigorous breaking load tests and provide comprehensive factory inspection reports before dispatch.
Secure Engagement: The pin engages a minimum of ≥3 thread turns for maximum pull-out resistance, featuring an optional cotter pin hole. The smoothly rounded body prevents abrasive damage to synthetic slings.
Tool-Friendly Geometry: The hexagonal nut (measuring 24mm flat for the 2" diameter model) fits standard rigging tools perfectly, while the knurled surface provides excellent grip for heavy work gloves.
System Compatibility: The standardized wide throat design (1.2×diameter) perfectly accommodates and flawlessly integrates with wire ropes, lifting chains, synthetic slings, and heavy crane hooks.
Space Optimization: Features a compact overall footprint (2.5×diameter) for tight spaces, while remaining remarkably lightweight (just 0.5kg for the 3/8" WLL 2 tons specification).
Scalable Lifting Capacities: We accommodate specialized project demands by offering massive 4" diameter/80-ton WLL shackles forged from Grade 100 steel (≥1000MPa) for offshore platforms, down to compact 1/4" diameter/0.5-1 ton WLL (Grade 60 steel) variants for localized workshops. Our engineering team readily adjusts throat width and pin length to match your exact rigging geometry, and we supply comprehensive WLL/breaking load test reports for every customized batch.
Environment-Specific Metallurgy: For extreme environments, we customize the base material and surface finish. We utilize specialized 35CrNiMoV alloy (delivering ≥20J impact toughness at -60℃) for Arctic exploration projects, and 2507 super duplex stainless steel for highly corrosive chemical plant applications. Alternative coating options include Dacromet (rated for a 1200-hour salt spray test), color-customizable epoxy for visual identification, and PTFE for low-friction pin engagement.
Compliance and Smart Tracking: To streamline your procurement and compliance audits, we provide ABS-certified hardware for marine use, CSA-certified units for North America, and fully OSHA-compliant shackles. We efficiently integrate technical documentation, offering downloadable PDF specifications and CAD models. Additional safety upgrades include self-locking nuts for high-vibration zones, embedded RFID tags for digital inventory traceability, and integrated load sensors for real-time overload alerts, all backed by SGS/DNV certifications.
To ensure your heavy rigging hardware arrives in pristine condition ready for immediate deployment, we employ rigorous packaging standards. Each batch is secured using rust-preventative wrapping and mounted on heavy-duty, impact-resistant industrial pallets designed to withstand rough transit handling. Our scaled manufacturing capabilities guarantee rapid fulfillment and consistent availability for large-volume procurement demands, keeping your project timelines on track. Beyond the physical product, we actively reduce your long-term operational risks by providing clear, documented warranty commitments and straightforward return policies. Furthermore, our dedicated engineering team offers expert lifting technology consultation, assisting site managers in selecting the optimal rigging configuration, calculating load distributions, and ensuring absolute compliance with local safety directives.
