Round U-Bolts Sets — Steel Pipe Clamps for M6 to M12 Threaded Rods, 16–219mm Inner Width
When a standard clamp slips, strips, or simply won't fit the pipe or tube you're securing, the right round U-bolt makes all the difference. Fabricators, plumbers, automotive builders, and structural DIYers who need a reliable, repeatable fastening solution across a wide range of pipe diameters will find exactly what they need here.
Each set includes a round-bend U-bolt, matching hex nut(s), and a bearing plate, machined from carbon steel with a zinc-plated finish for corrosion resistance. Thread diameters span M6 (pitch 1mm), M8 (pitch 1.25mm), M10 (pitch 1.5mm), and M12 (pitch 1.75mm). Inner widths range from 16mm (approx. 0.63 in) up to 219mm (approx. 8.62 in), accommodating pipes and tubes from small-bore hydraulic lines to large structural sections.
Typical applications include securing exhaust pipes and roll-cage tubing in automotive builds, clamping conduit and water pipes in plumbing and electrical installations, and anchoring structural round bar or scaffolding in construction and workshop fabrication projects.
🔩 Compatible with round pipes, tubes, and bars within the selected inner-width range. Verify pipe OD before ordering.
✅ Key Features of These Round U-Bolt Sets
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Complete Set Included
Each order ships with the U-bolt body, hex nut(s), and a flat bearing plate — everything needed for a secure, load-bearing installation without sourcing separate hardware.
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Wide Size Range
Inner widths from 16mm to 219mm (0.63–8.62 in) and thread sizes M6 through M12 cover the majority of pipe-clamping applications in one product family.
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Metric Thread Precision
Threads are cut to standard metric pitches (1mm / 1.25mm / 1.5mm / 1.75mm), ensuring compatibility with standard metric nuts, lock nuts, and threaded inserts.
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Zinc-Plated Carbon Steel
The zinc coating provides a barrier against surface oxidation, suitable for indoor, sheltered, and light-duty outdoor environments where moderate corrosion resistance is required.
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Flexible Pack Quantities
Available in sets of 1, 2, or 5 per order — scale your purchase to match the job size without over-buying or under-stocking.
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Round-Bend Profile
The smooth round bend conforms evenly to cylindrical surfaces, distributing clamping load around the pipe circumference to reduce stress concentration and surface marking.
| Product Type |
Round U-Bolt Set (U-bolt + nut + plate) |
| Material |
Carbon steel, zinc-plated |
| Thread Sizes |
M6, M8, M10, M12 |
| Thread Pitch |
M6: 1mm | M8: 1.25mm | M10: 1.5mm | M12: 1.75mm |
| Inner Width Range |
16mm – 219mm (approx. 0.63 – 8.62 in) |
| Bolt Length Range |
See variant options |
| Finish |
Zinc plated |
| Pack Quantity |
1 / 2 / 5 per set (see variant options) |
| Drive Style |
Hex nut (wrench-driven) |
| Tensile Strength |
See variant options |
| Application |
Pipe clamping, conduit support, automotive, structural |
❓ Frequently Asked Questions
How do I choose the correct inner width for my pipe?
Measure the outer diameter (OD) of the pipe or tube you need to clamp. The U-bolt inner width should match or be very slightly larger than the pipe OD — typically within 1–2mm — to ensure a snug, secure fit without excessive play. Refer to the Size option (e.g., M6x34x60mm: M6 thread, 34mm inner width, 60mm leg length) to identify the correct variant.
What do the three numbers in the Size option mean (e.g., M8x42x100mm)?
The format is Thread Diameter x Inner Width x Leg Length. So M8x42x100mm means: M8 metric thread, 42mm inner width (the gap the pipe sits in), and 100mm leg length (the straight threaded section on each side). Choose the leg length based on the thickness of the mounting surface plus the nut engagement depth you need.
Are these U-bolts suitable for outdoor or wet environments?
The zinc plating provides moderate corrosion resistance suitable for sheltered outdoor use, light moisture exposure, and indoor plumbing applications. For prolonged outdoor exposure, salt-spray environments, or submerged applications, consider stainless steel U-bolts instead. Applying an additional anti-corrosion coating after installation can extend service life in harsher conditions.
Can I use these U-bolts on square or rectangular tubing?
These are round-bend U-bolts designed to conform to cylindrical surfaces. They are not recommended for square or rectangular tubing, as the round profile will only contact the corners, resulting in uneven load distribution and potential slippage. For square or rectangular sections, a square-bend U-bolt is the appropriate choice.
What is the difference between the pack quantities (1, 2, or 5 sets)?
Each set includes one U-bolt body, the corresponding hex nut(s), and a bearing plate. Selecting Amount(Set) = 5 gives you five complete sets; Amount(Set) = 2 gives two complete sets; Amount(Set) = 1 gives one complete set. Choose the quantity that matches your project requirements. Larger packs offer better per-unit value for multi-point installations.
How much load can these U-bolts handle?
Load capacity depends on the thread size, material grade, and installation method. As a general guide, M6 carbon steel U-bolts are suited to light-duty clamping; M8 and M10 to medium-duty structural and automotive applications; M12 to heavier structural loads. For safety-critical applications, consult an engineer and verify the specific grade and proof load of the fastener before use.
Do I need any special tools to install these U-bolts?
No special tools are required. A standard metric wrench or socket set matching the nut size (typically 10mm for M6, 13mm for M8, 17mm for M10, 19mm for M12) is sufficient. Torque to the manufacturer's specification for the thread size and grade; if no spec is available, hand-tighten firmly and apply an additional quarter-turn with a wrench for a secure, vibration-resistant connection.
🛒 Select your Size, Thread Pitch, and Amount above, then add to cart.
