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When a loose pipe rattles against a frame or a conduit shifts under vibration, the right square U-bolt makes the difference between a secure installation and a recurring maintenance headache. These square U-bolts are designed for engineers, maintenance technicians, and serious DIYers who need a dependable, corrosion-resistant fastener across a wide range of clamping tasks.
Each square U-bolt is formed from carbon steel with a galvanized zinc coating for corrosion resistance. The square-bend geometry provides flat, parallel legs for stable, even clamping force. Thread diameters span M6 through M16, with leg lengths ranging from approximately 20 mm to 220 mm (0.79 in to 8.66 in) and inside widths from approximately 20 mm to 210 mm (0.79 in to 8.27 in), covering a broad spectrum of pipe and structural profiles. Each variant ships with matching hex nuts and washers as indicated by the size designation.
Typical use cases include pipe and conduit clamping to unistrut or channel framing in HVAC and plumbing installations, securing round or square tubing to structural steel in fabrication and welding projects, and anchoring exhaust or hydraulic lines in automotive and industrial maintenance environments where vibration resistance and corrosion protection are critical.
Flat parallel legs distribute clamping load evenly across the saddle plate, reducing stress concentration on pipe walls and structural members.
Zinc galvanizing provides a protective barrier against oxidation and moisture, extending service life in both indoor and outdoor environments.
Thread diameters from M6 to M16 with inside widths from ~20 mm to ~210 mm (0.79–8.27 in) cover light-duty conduit through heavy structural pipe clamping.
Compatible with standard metric hex nuts and washers, simplifying sourcing and replacement in the field without special tooling.
Available in 1, 2, or 5-piece packs so you can order exactly what your project requires — no excess inventory, no shortage mid-job.
Suited for HVAC, plumbing, electrical conduit, automotive exhaust, marine rigging supports, and general fabrication clamping tasks.
| Product Type | Square U-Bolt |
|---|---|
| Material | Carbon Steel |
| Surface Treatment | Galvanized (Zinc Coated) |
| Thread Standard | Metric Coarse (ISO) |
| Thread Diameter Range | M6 – M16 |
| Inside Width Range | ~20 mm – ~210 mm (0.79 in – 8.27 in) |
| Leg Length Range | ~35 mm – ~380 mm (1.38 in – 14.96 in) |
| Bend Style | Square (90° corners) |
| Included Hardware | See variant options |
| Pack Quantity | 1 Pcs / 2 Pcs / 5 Pcs (see variant) |
| Weight | See variant options |
Measure the outer diameter (OD) of your pipe or conduit. The inside width of the U-bolt should match or be very slightly larger than the pipe OD to allow the saddle plate to seat flush. For example, a 1-inch nominal pipe has an OD of approximately 33 mm — select an inside width of 33–35 mm. Check the size designation in the variant name (format: Thread Diameter × Inside Width × Leg Length).
The three numbers represent: Thread Diameter × Inside Width × Leg Length. So M8 x 50 x 100mm means an M8 thread, 50 mm inside width (the gap between the two legs), and 100 mm leg length (the straight threaded section below the bend). Always verify all three dimensions against your application before ordering.
These square U-bolts are manufactured from carbon steel with galvanized coating, suitable for general pipe clamping, conduit support, and light-to-medium structural fastening. For safety-critical or certified load-bearing applications, consult a structural engineer and verify the required proof load and material grade against your project specifications.
The zinc galvanizing provides meaningful corrosion resistance for outdoor, damp, and mildly corrosive environments. For highly aggressive environments such as coastal salt air, chemical exposure, or continuous immersion, consider additional protective coatings or stainless steel alternatives. Inspect periodically and re-coat if the zinc layer shows signs of white rust or degradation.
Yes. The threads follow the standard metric coarse pitch series (ISO), so they are compatible with any standard metric hex nut and flat washer of the matching diameter. This makes field replacement and supplementary hardware sourcing straightforward without special-order parts.
Select the pack quantity based on your project needs. Single-piece (1 Pcs) packs are ideal for repairs or prototyping where you need just one fastener. Two-piece (2 Pcs) packs suit paired clamping points on a single run. Five-piece (5 Pcs) packs offer better per-unit value for installations with multiple clamp points of the same size, such as a full conduit run or pipe rack.
Installation requires a standard metric wrench or socket set matching the nut size for your chosen thread diameter (e.g., M8 bolts typically use a 13 mm wrench). A torque wrench is recommended for consistent clamping force, especially on pipe systems where over-tightening can deform thin-wall conduit. No special tools are required beyond standard hand tools.
