304 Stainless Steel Eye Bolt M3–M48 | Heavy-Duty Lifting Ring Screw

Match the thread diameter to your tapped hole or nut size. As a general reference: M6 (≈1/4") is typically used for light hanging fixtures and small rigging points; M10–M12 (≈3/8"–1/2") are generally suited for medium workshop loads; M16 and above (≈5/8"+) are commonly used for heavier structural and industrial rigging. Always verify the thread pitch and confirm the working load limit before use in any load-bearing application.

Working load limits vary by size and are not printed on the fastener itself. As a general guideline, smaller sizes (M3–M5) are typically rated for light-duty applications under 50 kg, while larger sizes (M20+) can generally support several hundred kilograms in vertical in-line loading. For any safety-critical lifting application, please contact us to confirm the rated WLL for your specific size, and always apply an appropriate safety factor per applicable rigging standards (e.g., ASME B30.26).

Yes — 304 stainless steel (18-8) offers good corrosion resistance in outdoor, humid, and mildly marine environments. It is generally suitable for freshwater marine use, coastal outdoor installations, and exposed workshop hardware. For highly aggressive saltwater immersion, chemical processing, or chlorinated pool environments, 316 stainless steel is typically recommended for superior chloride resistance.

These lifting ring screws use standard metric coarse thread per ISO 68-1, which is the most widely used metric thread standard globally. They are compatible with standard metric hex nuts, coupling nuts, threaded inserts, and tapped holes of the corresponding size (e.g., an M10 eye bolt fits a standard M10 nut or M10 tapped hole). They are not compatible with UNC or UNF inch-thread fasteners without an adapter.

Standard straight-shank eye bolts like these are generally designed for in-line (vertical) loading through the axis of the shank. Applying angled or side loads introduces bending stress on the shank, which can significantly reduce the effective load capacity. For applications requiring angular loading (typically beyond 45° from vertical), a shoulder-pattern eye bolt or a swivel hoist ring is generally recommended. Always consult applicable rigging guidelines for your specific load angle.

Thread the eye bolt fully into the tapped hole or through a clearance hole with a backing nut. Tighten until the eye is snug and oriented in the direction of the intended load. Avoid over-torquing, which can stress the shank or distort the eye. For critical lifting points, use a calibrated torque wrench and follow the torque specifications for the thread size. Inspect the installation before each use for signs of thread damage, corrosion, or deformation.

The terms are commonly used interchangeably in the hardware and rigging industry. Both refer to a fastener with a closed circular loop (the "eye" or "ring") on one end and a threaded shank on the other. "Lifting ring screw" and "eyelet screw bolt" are simply alternate names for the same style of hardware. The closed ring allows attachment of hooks, shackles, wire rope, chain, or carabiners for lifting, hanging, and rigging applications.