| Shoulder Eyebolt | Forged carbon or alloy steel bolt with an integral shoulder and eye. | Size-specific ratings are common. As an example, DIN 580 tables list approximately 1.2 metric tons WLL for an M20 bolt in straight vertical lifting; the exact value depends on the edition, geometry, and installation. | Primarily axial loading with the shoulder fully seated. Side loading and angular loading require the manufacturer’s reduced rating or are prohibited. | DIN 580; ASME B30.26 guidance for detachable lifting devices; applicable machinery and lifting regulations in the destination market. | Fatigue test method, stress range, load ratio, number of cycles, crack inspection method, and the allowable angular-loading envelope. | Zinc electroplating for mild indoor exposure; hot-dip galvanizing for outdoor exposure; stainless steel only when the design is specifically rated for lifting. | Confirm thread engagement, seating surface, marking, proof-test record, and whether the WLL applies only to vertical lifting. |
| Swivel Hoist Ring / Pivoting Lifting Bolt | High-strength bolt with a rotating or pivoting load ring, washer, and engineered mounting interface. | Commercial ranges commonly extend from below 1 ton to more than 50 tons, but WLL is configuration-specific and must be taken from the product certificate. | Designed for controlled angular loading within the stated pivot and rotation limits. The bolt must be torqued and fully engaged as specified. | ASME B30.26; manufacturer design calculations and proof-test procedures; ISO 17025 laboratory competence is useful for independent testing. | Fatigue S-N curve or cycle-life report, maximum side-load angle, bolt preload, cyclic torque requirements, and inspection intervals. | Corrosion-resistant alloy, zinc flake coating, zinc plating, or hot-dip galvanizing; avoid coating systems that alter critical thread fit or preload. | Highest priority for WLL traceability, heat-number control, proof loading, torque instructions, and clear load-angle diagrams. |
| Fixed Lifting Eye Nut | Forged or machined eye nut installed on a compatible threaded stud or bolt. | WLL varies by thread diameter, nut geometry, material, and mounting arrangement. DIN 582 provides size-based eye-nut dimensions and lifting guidance; it is not a universal rating for every custom design. | Generally intended for straight lifting when fully tightened against a suitable surface. Angular loading requires an approved reduced WLL or separate design verification. | DIN 582; ASME B30.26 guidance; local requirements for lifting accessories and threaded connections. | Cyclic axial test results, thread-stripping assessment, eye-section stress analysis, and evidence that the mating bolt or stud has equal or greater capacity. | Hot-dip galvanized carbon steel, plated steel, or corrosion-resistant alloy subject to a verified lifting rating. | Check nut seating, thread class, stud protrusion, tightening method, and protection against loosening during repeated lifting. |
| Engineered Bolt-On Lifting Lug | Fabricated or forged lug secured by high-strength bolts to a machine frame, vessel, mold, or structural component. | No universal WLL. Capacity must be calculated from the lug, bolt group, base material, edge distance, welds if present, and load direction. | May support vertical, transverse, or angular loads only when specifically engineered and marked for those directions. | ASME BTH-1 design principles for below-the-hook devices; ASME B30.20 and B30.26 where applicable; EN 13155 may apply to lifting attachments in relevant markets. | Finite-element stress report, fatigue category, bolt preload and slip analysis, load-cycle spectrum, crack-testing procedure, and full-scale prototype test. | Paint system, zinc-rich primer, hot-dip galvanizing, or stainless construction selected according to the base material and service environment. | Require a signed calculation package and installation drawing; a generic bolt certificate is insufficient to establish assembly WLL. |
| Weld-On Lifting Stud or Pad Eye | Forged or rolled lifting attachment permanently welded to a structure or fabricated base. | WLL is engineered for the complete attachment, welds, parent material, and load path; standard bolt-size ratings do not apply. | Load direction, sling angle, weld orientation, and local structural stiffness must be defined before rating. | ASME BTH-1; ASME B30.20; EN 13155 where applicable; qualified welding procedures and personnel according to the governing fabrication code. | Fatigue class, weld detail category, cyclic test results, non-destructive examination plan, and inspection frequency after installation. | Coating system compatible with weld zones, marine paint systems, hot-dip galvanizing where fabrication permits, or corrosion-resistant base material. | Verify weld procedure qualification, welder qualification, material traceability, NDT records, and post-weld corrosion treatment. |
| Shoulder Lifting Bolt with Captive Washer | Forged shoulder bolt or lifting bolt with an integrated washer or retaining feature for repeatable installation. | Typically rated by exact diameter, thread length, shoulder geometry, and load direction. WLL must not be inferred from the tensile grade alone. | Usually axial or limited-angle loading. The captive washer improves assembly control but does not automatically increase lifting capacity. | ASME B30.26 guidance; applicable fastener specifications; engineering validation for custom lifting applications. | Proof and fatigue testing of the complete bolt, washer, and mating assembly; preload retention and thread-wear data for repeated use. | Electroplating, zinc flake, black oxide with corrosion inhibitor, or stainless alloy where the complete assembly remains lifting-rated. | Confirm captive-component retention, minimum thread engagement, torque range, proof-test load, and replacement criteria. |
| Stainless-Steel Lifting Eyebolt | Forged or machined stainless-steel eye bolt intended for environments where corrosion resistance is important. | WLL must be separately established; corrosion resistance does not guarantee lifting suitability or equivalent capacity to alloy steel. | Use only within the certified direction and angle limits. Stainless threads require attention to galling and correct lubrication policy. | Applicable stainless fastener material standards, DIN 580 or DIN 582 where dimensionally relevant, and ASME B30.26 guidance. | Fatigue performance in the selected stainless grade, proof testing after passivation, and evidence that corrosion exposure does not reduce WLL. | Passivation or electropolishing; avoid relying on salt-spray hours alone because laboratory salt spray does not directly predict field service life. | Request material grade, heat treatment, passivation record, galling-control instructions, and a corrosion-service limitation statement. |
