Product Summary

Longze Heavy-Duty Lifting Eye Nuts are essential female threaded fasteners designed for permanent attachment to equipment for overhead lifting and tensioning. Manufactured

in Yongnian, China, our eye nuts are drop-forged to ensure a continuous grain flow, providing superior fatigue resistance and a guaranteed Working Load Limit (WLL). From offshore

oil rigs to industrial motor hoisting, Longze eye nuts deliver the structural security required for vertical and angular lifts.

• ✔ Drop-Forged Integrity: Unlike cast alternatives, our forged eye nuts eliminate internal porosities, ensuring zero-failure performance under rated loads.

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• ✔ High-Grade Stainless Steel: Available in SS304 and SS316 for maximum acid and alkali resistance in harsh maritime environments.

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• ✔ Precision Threading: Internal threads are tapped to 6H/2B tolerances, ensuring a seamless fit with standard bolts and studs even after surface treatment.

• Standards: DIN 582, ISO 3266, ASME B30.26.

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• Thread Range: M6 to M64 | 1/4" to 2-1/2".

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• WLL Capacity: 0.07 Ton to 16 Ton (Based on vertical lift).

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• Material Grade: Carbon Steel C15E | Stainless Steel A2-70 (304) & A4-80 (316).

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• Surface Finish: Highly Polished (Stainless), Zinc Plated, Hot Dip Galvanized.

Mechanical Properties & Material Standards

• Matching the steel grade to the structural requirements of the transmission line.

• Material Grade	Tensile Strength	Yield Strength	Elongation	Environmental Suitability
  C15E (Carbon)	410 - 540 MPa	245 MPa	≥ 22%	General Industrial / Indoor
  SS304 (A2)	700 MPa	450 MPa	≥ 30%	Food Grade / General Outdoor
  SS316 (A4)	800 MPa	600 MPa	≥ 25%	Marine / Chemical / Offshore

Standard Cross Arm Dimensions

• Common angle steel configurations for standard utility pole mounting.

• Thread Size (D)	Eye ID (d1)	Eye OD (d3)	Base Dia (d2)	Vertical WLL (kg)
  M12 (1/2")	30 mm	54 mm	30 mm	340 kg
  M16 (5/8")	35 mm	63 mm	35 mm	700 kg
  M20 (3/4")	40 mm	72 mm	40 mm	1200 kg
  M24 (1")	50 mm	90 mm	50 mm	1800 kg

Galvanizing & Corrosion Resistance

• Ensuring 30+ years of service life in corrosive environments.

• Surface Treatment	Process	Salt Spray Test	Haltbarkeit	Best Application
  Zinc Plated	Electrolytic	48 - 96 Hours	Moderate	Warehousing / Tooling
  Hot Dip Galv.	Thermal Bath	500 - 800 Hours	High	Utility / Power Lines
  Mirror Polished	Mechanical	1000+ Hours	Extreme	Yachting / Offshore

Avoid Pitfalls:

• Angular Load De-Rating: Many users ignore that lifting at a 45° angle reduces the WLL by 50% or more. Longze eye nuts include stamped safety warnings and load charts to ensure site safety.

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• Cast vs. Forged Risk: Cast eye nuts are prone to "brittle snap." Longze strictly uses Drop-Forging for all lifting hardware, ensuring the metal deforms slightly before failure, providing a vital visual warning.

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• Thread Engagement: We ensure the base of the eye nut is perfectly flat and perpendicular to the thread axis, preventing "bending stress" on the bolt it is attached to.

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Perfect Fit Assembly:

• Matched Stud Bolts: We recommend pairing our DIN 582 eye nuts with Longze DIN 580 Eye Bolts or Grade 8.8 studs for a fully certified lifting point.

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• Custom Tapping: Need special pitches (Fine thread) or Imperial sizes for older machinery? We can custom-tap forged blanks in our Yongnian facility.

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Quality Control & Logistics:

• ISO 9001 Certified: 5-step QC including 2x WLL Proof Load testing, thread Go/No-Go gauge inspection, and material spectrometer analysis.

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• Sea-Worthy Packaging: Packed in reinforced small boxes within master cartons, plastic-wrapped on fumigation-free pallets for global export.

• Q: Can these be used for permanent outdoor mooring? A: For saltwater environments, we strictly recommend our Stainless Steel 316 eye nuts with a mirror-polished finish to prevent pitting corrosion.

• Q: What is the safety factor of your DIN 582 eye nuts? A: Our standard safety factor is 5:1 (Breaking Load is 5x the WLL), complying with international rigging safety codes.