M8 Eye Bolts 304 Stainless Steel – Threaded Ring Hanging Screws for Catenary Wire & Rigging

Measure the thickness of the material you are fastening through, then add at least 1.5× the bolt diameter (12mm for M8) for adequate thread engagement. For example, a 25mm board typically calls for a 40–50mm eye bolt. Lengths 20–60mm are full-thread; 70–150mm have a 40mm threaded section. In inches: 20mm ≈ 13/16", 50mm ≈ 2", 100mm ≈ 4", 150mm ≈ 5-7/8". When in doubt, size up.

Working load limits vary by installation angle and anchoring material. A vertically loaded M8 eye bolt in 304 stainless steel can generally handle 100–200 kg in a straight-pull configuration. Always apply a safety factor of at least 4:1 and consult a structural engineer for critical load-bearing applications. Angled loads significantly reduce the rated capacity.

Yes. 304 stainless steel offers good corrosion resistance for most outdoor environments including rain, humidity, and mild coastal exposure. For heavy marine or saltwater immersion applications, 316 stainless steel is generally recommended instead. If you are unsure, contact us to confirm suitability for your specific environment.

These eye bolts use the standard M8 metric coarse thread (M8 × 1.25 pitch), compatible with any standard M8 nut, coupling nut, or threaded insert. They are not compatible with UNC/UNF inch-standard threads. Most hardware sold in the US and internationally for metric applications will fit directly.

Full-thread bolts (20–60mm total length) are threaded along their entire shank, giving maximum grip in thinner materials. Partial-thread bolts (70–150mm) have a 40mm threaded section at the tip; the remaining shank is smooth. This is the standard construction for longer fasteners passing through thicker substrates such as timber beams or structural panels.

Yes — this is one of the most common uses for M8 threaded eye ring screws. The closed-loop eye accepts catenary wire, suspension cable, rope, or S-hooks. Ensure the wire diameter fits through the eye opening and that the anchor point (wood, concrete, or steel) is rated for the combined load of the wire and fixtures. For spans over 5 meters, we recommend using a turnbuckle to tension the wire properly.

For a single repair or test installation, the 1-piece option works well. For most catenary wire or cable hanging projects, you will typically need at least 2 anchor points, so the 2- or 3-piece options are popular. The 5- and 10-piece packs offer a lower per-piece cost and are ideal for larger installations, job-site stock, or when you want spares on hand.