M6 M8 Open Hook Eye Bolt Expansion Anchor — A4 Stainless Steel, Heavy Duty

M6 (approximately 1/4" thread diameter) is generally suitable for lighter loads and smaller fixtures such as hanging planters, light chains, or cable guides. M8 (approximately 5/16" thread diameter) is typically chosen for heavier applications like swing sets, hammocks, or structural cable runs. Always check the load rating of your specific fixture and add a safety margin of at least 3:1.

Working load capacity depends on the base material, embedment depth, and installation quality. In solid concrete, M6 expansion anchors typically support 150–300 lbs and M8 anchors typically support 300–600 lbs in shear or tension. Always consult a structural engineer for safety-critical applications and never exceed the rated working load.

Yes. A4 stainless steel (equivalent to 316 grade) contains molybdenum, which provides superior resistance to chloride corrosion compared to standard A2/304 stainless. These are generally well-suited for coastal, marine, poolside, and outdoor exposed applications where long-term rust resistance is essential.

These use metric threads — M6 and M8. M6 is approximately equivalent to 1/4" UNC and M8 is approximately equivalent to 5/16" UNC, but they are not interchangeable with imperial threads. Ensure your mating hardware (carabiners, shackles, nuts) uses the same metric standard to avoid cross-threading.

These open hook eye bolt expansion anchors are designed for solid masonry substrates including concrete, brick, and block. They are generally not recommended for hollow block, drywall, or soft materials without additional backing. Always pre-drill with the correct diameter masonry bit and ensure the hole is clean and free of debris before insertion.

We offer 2-piece and 10-piece packs. The 2-piece option is ideal for single-point hanging applications like a porch swing or hammock. The 10-piece pack is cost-effective for projects requiring multiple anchor points, such as cable tray runs, garden wire trellis systems, or multi-point rigging setups.

For M6 expansion anchors, typically use a 6mm (15/64") masonry drill bit. For M8, typically use an 8mm (5/16") masonry bit. Drill to the required embedment depth, clear the hole of dust, insert the anchor, and tighten until the sleeve expands fully against the bore wall. Always follow the specific installation instructions included with your anchors.