Traditional lifting eyes usually rely on a separate threaded stud or a pre-installed mounting point. This adds extra steps, such as welding, machining, or tapping holes on each fixture location. A self-tapping lifting eye screw simplifies the process by creating its own thread directly inside a prepared pilot hole. The tapered lead section and optimized cutting thread design help form consistent engagement during installation, allowing fixtures, molds, and equipment frames to add lifting points quickly and efficiently.
Unlike our countersunk Phillips self tapping screws, which are developed for panel fastening applications, this lifting eye screw is engineered for axial loading and repeated lifting use. It features a stronger thread profile, deeper engagement, and a shank structure designed around the required lifting capacity to provide secure and reliable performance.
Pilot Hole and Base Material: Where Strength Actually Lives
A lifting eye screw is only as strong as the thread it creates - and the thread depends on the strength of the base material. The correct pilot hole size and engagement depth are critical for a reliable connection:
| Base Material | Pilot Hole Diameter | Min. Engagement Depth |
|---|---|---|
| Structural steel (S235–S355) | Nominal Ø − 0.5 mm | 1.0 × d |
| Cast iron | Nominal Ø − 0.4 mm | 1.25 × d |
| Aluminum (6061/6082) | Nominal Ø − 0.6 mm | 2.0 × d |
For aluminum, longer engagement is required to reduce thread stripping risk. Never re-tap a hole that has already carried a load, as the existing thread may be compromised. For thin-wall applications, a shoulder-backed design can distribute part of the load into compression and reduce thread stress.
Our tapping service provides thread-forming and thread-cutting options optimized for different materials and load requirements.
Lifting Eye Nut Self Tapping Screw Specifications
| Parameter | Capability |
|---|---|
| Thread sizes | M8–M24 metric coarse; UNC/UNF available on request |
| Material | 304 / 316 stainless steel, certified bar stock |
| WLL range (90°) | 80 kg (M8)–800 kg (M24), batch verified |
| Surface finish | ASTM A967 passivation; electropolishing available |
| Thread form | Thread-cutting design with chip relief |
| Quality system | ISO 9001:2015; material certificates and inspection reports |
| MOQ | No minimum, from prototypes to production |
| Lead time | Prototypes: 7–14 working days; production: 2–4 weeks |
Frequently Asked Questions
What load capacity can the self tapping lifting eye screw achieve?
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The working load limit depends on thread size, material grade, installation depth, base material strength and lifting angle. We provide engineering support to select the suitable specification based on your actual lifting requirements.
What type of materials can this lifting eye screw be installed into?
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It is suitable for applications where the base material allows thread forming, such as certain metal plates, fixtures and equipment structures. We recommend confirming material hardness and thickness before installation to ensure secure thread engagement.
Can you customize the eye design for different lifting equipment?
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Yes. We can customize eye diameter, shape, thread specification, length, surface finish and load requirements according to your application or drawings.
Do you provide inspection reports or material certificates?
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Yes. Material certificates and quality inspection documents can be provided according to customer requirements to support traceability and project approval.
Is it suitable for repeated installation and removal?
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Yes. When installed within recommended parameters, the stainless steel lifting eye screw can be removed and reused for applications such as fixtures, tooling and temporary lifting points.
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