Industrial Screw Eyes and Eye Screws China Factory Suppliers Heavy Duty Lag Thread Bolts
Longze Screw Eyes and Eye Screws are high-performance industrial fasteners engineered for heavy-duty rigging, tensioning, and secure hanging applications. These specialized lag thread eye bolts feature a closed circular loop and a precision-engineered self-tapping thread, allowing for direct installation into timber, wood, or masonry with appropriate plugs to create reliable anchor points for cables, ropes, and chains.
Designed to meet rigorous industrial standards, our screw eyes are available in a variety of premium materials including Marine Grade SS316 and high-strength carbon steel. Whether you are securing cargo in logistics, installing industrial lighting, or rigging maritime equipment, Longze provides the mechanical integrity and corrosion resistance necessary to ensure safety and longevity in the most demanding environments.
Detailed Parameters
| Standards | DIN 529 (Modified) / ASME B18.15 / Custom Specs | Metric Size Range | M3 to M24 |
|---|---|---|---|
| Inch Size Range | #2 to 1" (Shank Diameter) | Thread Type | Deep Wood / Lag Thread (Partially Threaded) |
| Material Options | Carbon Steel (4.8/8.8), Stainless Steel (A2/A4), Brass | Surface Finishes | Zinc Plated, Hot-Dip Galvanized, Electropolished |
| Tensile Strength | 420 MPa to 800 MPa (Depending on Grade) | Corrosion Resistance | Up to 1000+ hours (Salt Spray Test) |
| Eye Construction | One-Piece Forged / Cold-Formed Closed Loop | Internal Finish | Deburred Smooth Surface |
Key Advantages
Maximum Grip
Deep-cut tapered lag threads ensure superior hold in timber, significantly reducing pull-out risk under dynamic loads.
Corrosion Resistance
Available in Marine Grade SS316 for ultimate protection against salt spray and acidic coastal environments.
One-Piece Forging
Forged as a single unit to eliminate structural weak points at the junction of the eye and the shank.
High Load Capacity
Precision-formed eyes maintain closure under significant tension, ideal for safety-critical structural tasks.
Smooth Internal Finish
Precision deburring of the internal eye prevents fraying or wear on synthetic ropes and wire cables.
Universal Compatibility
Standardized internal eye dimensions designed to fit common hooks, carabiners, and industrial shackles.
Product Gallery
Management Platforms
ISO 9001 Quality
Certified production with strict testing of eye closure integrity and dimensional accuracy.
Pull-Out Testing
Random batch verification of thread grip across various timber densities for safety.
Export Packaging
Bulk 25kg export cartons and fumigation-free pallets for international shipment.
Custom Labeling
Retail-ready bags or plastic tubs available with professional barcode labeling.
Precision Control
Rigid control over eye diameters to ensure 100% compatibility with rigging hardware.
Fast Response
Technical support and factory-direct pricing quotes delivered within 12 hours.
Material Comparison
| Material Grade | Tensile Strength | Best Application |
|---|---|---|
| Carbon Steel 4.8 | 420 MPa | General DIY / Interior |
| Carbon Steel 8.8 | 800 MPa | Heavy Rigging / Industrial |
| Stainless SS304 | ≥ 500 MPa | Outdoor / Garden / Food |
| Stainless SS316 | ≥ 600 MPa | Marine / Coastal / Chemical |
| Solid Brass | Moderate | Decorative / Low Load |
Frequently Asked Questions
No. Screw eyes are intended for stationary hanging and tensioning. For critical overhead lifting of machinery or people, we recommend using Shoulder Pattern Machine Thread Eye Bolts (DIN 580) with a nut.
While both are corrosion-resistant, SS316 (Marine Grade) contains molybdenum, making it significantly more resistant to chlorides and salt spray, making it essential for coastal or chemical environments.
To maximize pull-out strength and prevent splitting, always drill a pilot hole approximately 70% to 80% of the screw's minor diameter before driving the fastener.
Yes, they can be used in masonry provided you use a correctly sized expansion shield or plastic wall plug to anchor the lag thread securely.
Screw eyes are strongest when the load is applied in line with the shank. You should avoid heavy side-loading, as this can bend the shank or cause the eye to open.
We offer Zinc Plated (Clear/Yellow) for indoor use, Hot-Dip Galvanized for outdoor construction, and Black Oxide for decorative interior hardware.
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