M5 Eye Bolts 304 Stainless Steel – Threaded Ring Screws for Catenary Wire & Hanging

Measure the thickness of the material you're threading into, then add enough length for the shank to pass through and engage fully. For full-thread variants (20–40mm), the entire shank is threaded, giving maximum grip in thinner materials. For partial-thread variants (45–70mm, b=40mm), the threaded portion is 40mm — suitable for thicker substrates. As a general rule, at least 1.5× the bolt diameter (≈7.5mm for M5) should be engaged in the material. For example, a 30mm (≈1-3/16") full-thread bolt works well in a 25mm timber panel with a nut on the back.

Working load limits for M5 eye bolts generally range from 50–100 kg (110–220 lbs) depending on the angle of pull, installation quality, and substrate strength. Always apply a safety factor of at least 4:1 for overhead or dynamic loads. For critical structural applications, consult a qualified engineer and verify the specific load rating with us before ordering.

Yes. 304 stainless steel offers strong resistance to rust and oxidation in most outdoor environments, including garden catenary wire installations, pergola lighting, and exterior rope setups. For highly corrosive environments with constant saltwater exposure (e.g., dockside or coastal marine use), 316 stainless steel is generally recommended. Contact us if you need that grade.

These eye bolts use the standard M5 metric coarse thread (pitch typically 0.8mm), compatible with standard M5 nuts, threaded inserts, and tapped holes following ISO metric thread standards. They are not compatible with imperial (UNC/UNF) threaded fittings. If you're unsure, check whether your existing hardware is labeled "M5" (metric) or uses fractional inch sizing.

Choose full-thread (lengths 20–40mm) when you need maximum thread engagement in thinner materials such as wood panels, thin metal brackets, or when using an M5 nut on the back side. Choose partial-thread (lengths 45–70mm, b=40mm threaded portion) when you need a longer shank to pass through thicker material — the unthreaded shank section keeps the bolt aligned while the 40mm threaded end anchors securely.

For a basic catenary wire run, you'll need at least 2 eye bolts — one at each anchor point. Add one per intermediate support if your span exceeds roughly 3–4 meters (10–13 ft). We offer quantity options of 1, 3, 5, 10, 20, and 30 pieces so you can order exactly what your project requires without waste.

For M5 eye bolts threaded into wood, a pilot hole of approximately 4.0–4.2mm is generally recommended for softwoods, and 4.2–4.5mm for hardwoods. This reduces splitting risk while maintaining enough material for the threads to grip. Always drill perpendicular to the surface for a straight, secure installation.