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G277 Shoulder Eye Bolt
Thinkwell
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G277 Shoulder Nut Eye Bolt is a premium American forged lifting fastener, professionally known as fatigue-rated shoulder eye bolt with matched heavy hex nut. Different from S279 simple shoulder eye bolts, G277 is a complete bolt-and-nut assembly, featuring extended shank design, formal fatigue certification and stricter ASME B30.26 full compliance, belonging to heavy-duty industrial lifting grade rigging hardware.
Manufactured from high-grade 1045 carbon steel via integral hot drop forging and precise quenching & tempering heat treatment, G277 eye bolt achieves superior mechanical stability and anti-fatigue performance. It is officially fatigue rated at 1.5 times WLL under 20,000 loading cycles, with 5:1 standard safety factor and 2× proof load testing capacity. Equipped with factory-matched hot-dip galvanized heavy hex nut, it eliminates loose matching risks and is widely used for dynamic industrial lifting, marine rigging, heavy mold hoisting and long-cycle mechanical tensioning projects.
18 Years Professional Production Experience: We specialize in high-standard American fatigue-rated lifting hardware, with mature G277 forging and heat treatment process, strict third-party performance testing and long-term stable supply for North American industrial and marine markets.
Comes with factory-matched heavy-duty hex shoulder nut as a full assembly, different from single S279 eye bolt. The integrated matching ensures precise thread fit, uniform bearing stress and zero assembly deviation, greatly improving overall lifting safety.
Certified for cyclic dynamic lifting, stably withstands 1.5 times working load limit under 20,000 repeated loading cycles. Perfectly adapts to frequent vibration and alternating tension working conditions that ordinary eye bolts cannot endure.
Fully meets American lifting industry specifications in ductility, impact resistance, design factor, proof load and temperature adaptability. It supports formal engineering inspection and third-party safety certification for North American projects.
Adopts 1045 high-quality carbon steel integral forging + quenching and tempering process, with dense metal texture, no internal pores or cracks. The overall rigidity and toughness far exceed ordinary stamped and cast eye bolts, suitable for long-term heavy-duty service.
Features standardized extended shank design and full American UNC imperial thread, with accurate tooth pitch and smooth thread surface. It supports deep installation and thick equipment penetration, compatible with all standard American rigging accessories.
Designed with industrial-grade 5:1 safety factor, each finished product is sampled for 2 times WLL proof load test, ensuring no deformation or failure under extreme overload conditions.
Finished with hot-dip galvanization after thread processing, with thick and uniform zinc layer, excellent salt spray resistance, rust and corrosion resistance, ideal for outdoor, coastal and marine harsh working environments.
Reinforced integral shoulder structure fits the mounting surface tightly, effectively preventing bolt rotation, shaking and sinking during dynamic lifting, maintaining stable connection status for long-cycle operation.
Specially applicable for industrial dynamic lifting, large mold hoisting, marine rigging tensioning, construction heavy equipment fixing and mechanical cyclic loading scenarios.
Focus on production of American fatigue-rated G277 eye bolt assemblies for years, proficient in heat treatment parameter control and cyclic fatigue performance standards.
Each batch undergoes tensile test, 2× proof load detection, 20,000-cycle fatigue test, hardness calibration and dimensional inspection to ensure full compliance with G277 and ASME B30.26 standards.
Support custom extended shank length, special load grades, 304/316 stainless steel upgrade, laser logo marking and personalized export packaging.
Conventional full imperial sizes from 1/4'' to 1-1/2'' are in sufficient stock, supporting bulk wholesale, mixed batch delivery and urgent order fast shipment.
Independent forging, heat treatment and galvanizing production lines, one-stop finished assembly supply, no middleman markup, stable high-quality output.
Provide professional load matching, installation standard and angle use guidance to avoid eccentric load risks and ensure lifting operation safety.
Imperial Size | UNC Thread | WLL (lbs) In-Line Pull | Main Material | Surface Treatment | Matching Accessory | Application Scenario |
1/4" | 1/4-20 UNC | 650 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Precision equipment cyclic lifting |
3/8" | 3/8-16 UNC | 1,300 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Small mold dynamic hoisting |
1/2" | 1/2-13 UNC | 2,600 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | General industrial cyclic rigging |
5/8" | 5/8-11 UNC | 4,500 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Medium equipment tension fixing |
3/4" | 3/4-10 UNC | 7,200 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Large mold heavy-duty lifting |
7/8" | 7/8-9 UNC | 10,000 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Heavy machinery cyclic hoisting |
1" | 1-8 UNC | 12,000 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Marine equipment fixed rigging |
1-1/8" | 1-1/8-7 UNC | 15,000 lbs | 1045 Forged Carbon Steel | Hot-Dip Galvanized / Self Color | Matched Heavy Hex Nut | Offshore engineering lifting |
1-1/4" ~ 1-1/2" | Custom UNC Thread | Up to 21,000 lbs | 1045 Steel / 304/316 Stainless Steel | Hot-Dip Galvanized / Polished | Custom Matching Nut | Ultra-heavy industrial cyclic lifting |
G277 shoulder nut eye bolt is a high-end fatigue-rated American standard lifting assembly, mainly used for dynamic cyclic lifting, heavy mold hoisting, marine rigging tensioning and industrial equipment long-term fixed bearing. It is the preferred hardware for high-standard North American engineering and mechanical cyclic loading scenarios.
G277 is a complete bolt + heavy hex nut assembly with extended shank and professional fatigue resistance, suitable for dynamic and cyclic lifting; S279 is a single shoulder eye bolt without matched nut, mainly for static conventional lifting. G277 has higher safety factor, fatigue performance and engineering grade, meeting stricter ASME B30.26 full standards.
G277 eye bolt is professionally tested for cyclic service, which can stably bear 1.5 times the rated working load after 20,000 repeated loading cycles. It effectively avoids metal fatigue fracture caused by long-term vibration and alternating tension, far safer than ordinary non-fatigue eye bolts.
Yes. Our G277 eye bolts fully meet all technical requirements of ASME B30.26, including material ductility, impact resistance, 5:1 design factor, 2× proof load and temperature adaptability, supporting formal engineering inspection and certification.
Yes. The forged and tempered integral structure has stable mechanical fatigue resistance. After visual inspection for no deformation, no crack and intact thread and shoulder, it can be disassembled and reused multiple times, with low long-term engineering use cost.
G277 is mostly used for outdoor, marine and heavy industrial scenarios. Hot-dip galvanization after thread processing forms a thick protective layer, providing excellent salt spray, rust and corrosion resistance, ensuring long-term stable service in harsh environments.
G277 rated WLL is based on in-line straight pulling. For angle and eccentric loading, the actual working load must be reduced accordingly to avoid stress concentration and ensure lifting safety.
All conventional G277 sizes are in stock for fast bulk delivery. Custom shank lengths, stainless steel materials and exclusive logos are available within 3-7 working days, supporting long-term stable supply for North American rigging distributors and engineering projects.
