Product Summary

Longze Screw Eyes (also known as Eye Screws or Lag Thread Eye Bolts) are high-strength fasteners manufactured for heavy-duty rigging, tensioning, and hanging applications. Featuring a closed circular loop

(eye) and a sharp, self-tapping lag thread, these Longze Screw Eyes are designed to be driven directly into wood, timber, or masonry (with a wall plug) to provide a secure anchor point for ropes, cables, and chains.

• ✔ High Load Capacity: Precision-forged or cold-formed eyes ensure the loop remains closed under significant tension, ideal for structural and safety-critical tasks.

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• ✔ Self-Starting Lag Thread: The tapered, deep-cut wood threads are engineered for maximum grip in timber, reducing the risk of pull-out during dynamic loading.

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• ✔ Corrosion-Resistant Options: Longze offers premium Zinc Plated steel for indoor use and Marine Grade SS316 for harsh outdoor or coastal environments.

Key Features of Screw Eyes

• One-Piece Construction – Forged as a single unit to eliminate weak points at the junction of the eye and the shank.

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• Versatile Anchor Point – Can be used as a guide for wire rope, a tie-down point for cargo, or a heavy-duty hanger for industrial equipment.

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• Precision Eye Diameter – Standardized internal eye dimensions to accommodate common hook, carabiner, and shackle sizes.

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• Smooth Internal Finish – The inside of the eye is deburred to prevent fraying or wear on synthetic ropes and cables.

Technical Specifications

• Standards: DIN 529 (Modified) / ASME B18.15 (Lag Pattern) / Custom Industrial Specs

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• Metric Size Range: M3 to M24

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• Inch Size Range: #2 to 1" (Shank Diameter)

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• Thread Type: Deep Wood Thread (Lag Thread) / Partially Threaded

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• Material: Carbon Steel (Grade 4.8 / 8.8), Stainless Steel (A2 / A4), Solid Brass

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• Finish: Zinc Plated (Clear/Yellow), Hot-Dip Galvanized, Electropolished

• Material & Mechanical Properties

• Material	Grade	Tensile Strength	Corrosion Resistance	Application
  Carbon Steel	Grade 4.8	420 MPa	Medium (with Plating)	General DIY / Interior
  Carbon Steel	Grade 8.8	800 MPa	Medium (with Plating)	Heavy Rigging / Industrial
  Stainless Steel	SS304 (A2)	$\ge 500$ MPa	High	Outdoor / Garden / Food
  Stainless Steel	SS316 (A4)	$\ge 600$ MPa	Ultra-High	Marine / Coastal / Chemical

• Standard Dimensions (Heavy Duty Lag Thread Type)

• Size (d)	Eye ID (d1)	Eye OD (d2)	Shank Length (L)	Thread Length (b)
  M6 (1/4")	12 mm	22 mm	40 to 100 mm	25 to 60 mm
  M8 (5/16")	16 mm	28 mm	50 to 150 mm	35 to 90 mm
  M10 (3/8")	20 mm	35 mm	60 to 200 mm	45 to 120 mm
  M12 (1/2")	25 mm	45 mm	80 to 250 mm	60 to 150 mm

• Surface Treatment

• Coating	Process	Salt Spray	Application
  Zinc Plated	Electroplating	72 to 144h	Indoor Shelving / Furniture
  Hot-Dip Galvanized	Molten Zinc	500 to 1000h	Outdoor Construction / Fencing
  Electropolished	Chemical	1000+h	Marine Grade Stainless Steel
  Black Oxide	Chemical	24 to 48h	Decorative Hardware / Interior