M3 M4 M5 - M20 Eye Bolts Kit Screws Nut Washer Long Boat Stainless Steel A2 304

Match the thread diameter (M3, M4, M5, etc.) to the tapped hole or nut size already in your build. For shank length, measure the material thickness you're threading through and add at least 1.5× the bolt diameter for adequate thread engagement. If you're hanging a load, size up one diameter from the minimum calculated to maintain a safety margin.

Working load limits vary by thread diameter and shank length. As a conservative reference, M6 A2 stainless eye bolts typically handle 50–80 kg vertically when properly installed; M10 bolts typically handle 200–300 kg. For safety-critical overhead lifting, always consult a structural engineer and verify the rated load for your specific size. These bolts are suited for light rigging, cable management, and fixture hanging rather than heavy industrial crane use.

Yes. A2-grade 304 stainless steel offers solid resistance to atmospheric corrosion, fresh water, and mild salt exposure. For prolonged immersion in seawater or highly chlorinated environments, A4-grade 316 stainless is the preferred choice. For most outdoor, marine-adjacent, and humid workshop applications, 304 A2 performs reliably without surface treatment.

Yes. The threads conform to ISO metric standards, so they engage correctly with any standard M-series hex nut, coupling nut, or threaded insert of the matching diameter. They are not compatible with UNC or UNF imperial threads. Each kit already includes a matching hex nut and flat washer, so no additional hardware is needed for a basic installation.

Absolutely. Smaller sizes (M3–M6) are well-suited for aluminum extrusion frames, PC case cable management anchors, and electronics enclosures where a secure, low-profile attachment point is needed. The stainless finish also avoids galvanic corrosion concerns that arise when using carbon steel fasteners against aluminum over time.

Pack quantities depend on the size selected: smaller diameters (M3–M6) are available in 2, 4, 5, or 10-piece packs; larger diameters (M8–M24) are available in 1 or 2-piece packs. Select your size and quantity from the variant dropdowns above to see the exact pack included. This structure lets you buy a single bolt for a one-off repair or a multi-pack for a full build.

For most sizes, hand-tightening is sufficient for light-duty cable management and fixture hanging. For load-bearing applications, use a wrench on the hex nut to achieve firm seating against the washer and substrate. No special tooling is required beyond a standard metric wrench set. Ensure the mating surface is flat and the washer is seated properly to distribute clamping load evenly.