Stainless Steel A4 Expansion Bolts Threaded Stud Rod M6–M12 Extra Long

As a general rule, the bolt length should provide at least 2–3× the bolt diameter of embedment into the base material, plus enough threaded stud to pass through your fixture and accept a nut and washer. For example, an M8 bolt (8mm / ≈5/16") fastening a 20mm bracket into concrete would typically need at least 80–100mm (≈3.1–3.9") of embedment. When in doubt, choose the longer option — 130mm (≈5.1") or 150mm (≈5.9") — for a more secure hold.

Load capacity depends on the bolt diameter, embedment depth, concrete strength, and edge distance. In general, M6 bolts are suited for lighter fixtures and cable management, M8–M10 for medium-duty brackets and pipe hangers, and M12 for heavier structural loads. For safety-critical applications, always consult a structural engineer and refer to the manufacturer's load tables.

Yes. A4 (316) stainless steel is generally considered the go-to grade for outdoor, coastal, and marine fastening applications. It offers significantly better resistance to chloride-induced corrosion compared to A2 (304) stainless steel, making it a reliable choice for exterior wall mounts, dock hardware, and poolside installations.

These bolts use standard metric coarse threads per ISO 261, which is the most widely used metric thread standard in construction and mechanical applications. They are compatible with standard metric hex nuts, flange nuts, and washers in the corresponding size (M6, M8, M10, or M12) — no special adapters needed.

These threaded stud expansion bolts are designed for solid base materials — primarily solid concrete, brick, concrete block, and natural stone masonry. They are not recommended for hollow walls, drywall, or soft materials without appropriate anchoring sleeves. For best results, ensure the base material is free of cracks and the drill hole is clean and dry before installation.

Each set typically includes the expansion anchor body with the integrated threaded stud rod. If you need a nut and washer included, or require multi-piece kits, please contact us to confirm the exact contents before ordering.

Absolutely. The extra-long threaded stud rod design is specifically well-suited for pipe hanger installation, conduit support brackets, HVAC equipment mounts, and any application where you need a projecting anchor point from a concrete or masonry wall. The stud extends beyond the wall surface, allowing you to attach clamps, brackets, or fittings at the desired standoff distance.