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When a standard bolt won't do the job, engineers, fabricators, and serious DIYers reach for a U-bolt. Whether you're securing pipe runs, anchoring suspension components, or clamping round-bar assemblies, a loose or corroded fastener can mean costly rework or safety risk. These A2 stainless steel U-bolts are built for applications where moisture, vibration, and load cycles demand a fastener that holds its integrity over time.
Each U-bolt is machined from A2 (304) stainless steel — a widely trusted austenitic alloy offering a balanced combination of tensile strength and corrosion resistance. The U-bend profile spans thread sizes M6, M8, M10, and M12, with shank lengths ranging from approximately 14 mm (0.55 in) up to 328 mm (12.9 in) depending on the selected variant. Matching hex nuts and flat washers (gaskets) are available as add-on variants, sold in 2-piece sets, so you can complete the assembly in a single order.
Typical use cases include pipe clamp and conduit support installations where stainless steel U-bolts for pipe mounting are required; marine and outdoor structural brackets where A2 stainless U-bend screws resist salt-air oxidation; and automotive or trailer suspension links where M8 or M10 U-bolts with nuts and washers provide a secure, vibration-resistant clamp. The full thread engagement on both legs ensures even load distribution across the clamped surface.
| Material | A2 Stainless Steel (AISI 304) |
|---|---|
| Thread Standard | Metric (ISO 68-1) |
| Available Thread Sizes | M6, M8, M10, M12 |
| Leg Length Range | 14 mm – 328 mm (0.55 in – 12.9 in) |
| Thread Pitch | See variant options |
| Bend Inner Diameter | See variant options |
| Surface Finish | Mill finish (natural stainless) |
| Corrosion Resistance | A2 / ISO 3506 — suitable for outdoor and humid environments |
| Included Hardware | U-bolt only (1 pc); Nuts and washers available as separate variants (2 pcs) |
| Nut Type (optional) | Hex nut, metric standard |
| Washer Type (optional) | Flat washer (gasket), metric standard |
| Quantity per Order | 1 pcs (bolt) or 2 pcs (nut / washer variants) |
Select the thread size (M6, M8, M10, or M12) based on the load requirements and the nut/washer hardware you're pairing with. Then choose the leg length that matches the depth of the object being clamped plus the thickness of the mounting plate and nut engagement. If you're clamping a pipe, the inner bend diameter should match the pipe's outer diameter — check the variant options or contact us to confirm bend dimensions for your specific size.
A2 stainless steel (equivalent to AISI 304) is an austenitic grade with a typical tensile strength of around 500–700 MPa depending on the form and processing. It offers good mechanical strength for most structural clamping, pipe support, and bracket applications. For highly loaded or safety-critical structural joints, consult an engineer to confirm suitability.
Yes. A2 stainless steel provides solid resistance to atmospheric corrosion, rain, and moderate salt-air exposure, making it a reliable choice for outdoor pipe supports, garden structures, and light marine hardware. For full immersion in seawater or highly chlorinated environments, A4 (316) stainless steel would offer superior corrosion resistance.
Yes — the hex nuts and flat washers (gaskets) listed as separate variants are sized to match each corresponding thread diameter: M6 nut fits M6 U-bolts, M8 nut fits M8 U-bolts, and so on. The washers follow standard metric flat washer dimensions for each thread size (e.g., M6 washer: 12 mm OD × 1.6 mm thick; M8: 16 mm OD × 1.6 mm thick).
These U-bolts are commonly used for pipe clamping, conduit support, and round-bar anchoring. The key measurement to verify is the inner bend diameter — it should match or slightly exceed the outer diameter of the pipe or conduit being secured. Contact us with your pipe OD and we can confirm which size variant is the correct fit.
Yes, both legs of each U-bolt are threaded symmetrically to the same length, ensuring balanced nut engagement on both sides of the mounting plate. This provides even clamping force and prevents the assembly from tilting under load.
The bolt variants (1 pcs) include only the U-bolt itself. The nut variants (2 pcs) include two hex nuts matched to the selected thread size, and the gasket/washer variants (2 pcs) include two flat washers. If you need a complete assembly, add the U-bolt, the matching nut variant, and the matching washer variant to your cart separately.
