Bolts
U-Bolts & J-Bolts Manufacturer, Wholesaler, Supplier & Exporter
U-bolts and J-bolts are custom-formed to clamp pipes, mount leaf springs, or anchor cables and rigging. We manufacture these to custom bend radius and thread length in steel and stainless steel for pipe support, automotive, and rigging buyers.
Because U-bolts and J-bolts are formed to fit a specific pipe, tube, or anchoring situation rather than sold off a standard size chart the way a hex bolt is, the single most important number on the order isn't the thread size — it's the inside dimension across the bend, which has to match the outer diameter of whatever it's clamping. A U-bolt cut a few millimeters too tight or loose either won't fit or won't clamp securely.
Square-bend and round-bend U-bolts aren't interchangeable even at the same nominal size: square-bend versions sit flatter against a matching flat bracket, while round-bend versions wrap a round pipe more evenly. Mixing them up produces a U-bolt that technically closes around the pipe but distributes clamping force unevenly.
Minimum Order — Container Quantity (Approx.)
A standard 20ft container (~20 tons) holds approximately 100,000-160,000 pieces of U-bolts/J-bolts sized for common pipe diameters. Exact quantity depends on the bend size and thread length and is confirmed at quote time.
You don't need a full container to order. Hurain Engitech & Trade — the group Global Fasteners Exports operates under — regularly ships smaller, partial-container (LCL) orders of just a few pallets or boxes for buyers who don't yet need FCL volume, consolidated with other cargo to keep freight cost reasonable.
Specifications
Types
Round-bend U-bolts, square-bend U-bolts, and J-bolts.
Size range
Formed to fit pipe/tube OD from 15mm to 600mm; custom thread lengths.
Standards
Manufactured to buyer drawing or matched to standard pipe-support tables.
Finish
Hot-dip galvanized, zinc plated, or stainless steel.
Applications
Pipe support & clamping
Pipeline and HVAC duct support systems.
Automotive leaf springs
Leaf-spring mounting on trucks and trailers.
Rigging & cable anchoring
J-bolts for guy-wire and cable anchoring.
Solar & structural mounting
U-bolts for mounting purlins and rails to structural tube.
Materials Available
Steel
Corrosion-resistant
Bend radius and thread length are verified against buyer drawings or pipe-support tables before packing.
How We Manufacture & Export This Product
- 1
Drawing confirmation
Confirm pipe/tube OD, bend style, and thread length.
- 2
Bending & threading
CNC bending to the specified radius, followed by thread rolling on both legs.
- 3
Finishing
Hot-dip galvanizing, zinc plating, or stainless finishing.
- 4
Packing & export
Bundled with matching nuts and plates, palletized for container shipment.
Export Track Record
Custom-formed to specification for pipe-support fabricators and automotive spring manufacturers on export orders.
Real-World Use Cases
Pipe and conduit support
Clamping pipes and conduit to structural framework in pipeline, HVAC, and plumbing installations.
Leaf-spring mounting
Securing leaf springs to the axle on trucks and trailers, a role U-bolts have held for decades in automotive undercarriage design.
Guy-wire and cable anchoring
J-bolts anchoring tensioned cables and guy-wires to structural or ground anchors.
Common Mistakes Buyers Make
Ordering by pipe nominal size instead of actual OD
Nominal pipe sizes don't match actual outer diameter — always confirm the real OD before ordering a custom-bent U-bolt.
Mixing square-bend and round-bend styles
A round-bend U-bolt on a square bracket (or vice versa) contacts unevenly and can loosen under vibration.
Under-specifying thread length for the bracket stack
Thin brackets need shorter threads; thick structural brackets with washers and lock nuts need longer ones — measure the actual stack-up.
Glossary of Terms
- Inside dimension (ID)
- The clear opening across a U-bolt's bend, which must match the outer diameter of the pipe or tube it clamps.
- Square-bend vs. round-bend
- Square-bend U-bolts sit flat against angular brackets; round-bend U-bolts conform evenly to round pipe.
- Mounting plate
- The flat bracket a U-bolt's legs pass through, often supplied as a matched set with the U-bolt.
Quality Inspection We Perform
Dimensional inspection
Thread gauge, length, diameter, and head/drive geometry checked against the specified standard.
Material verification
Grade and material composition confirmed against the order specification, with mill test certificates on request.
Mechanical testing
Tensile strength, hardness, and proof-load testing on sample batches, particularly for structural and high-tensile grades.
Finish & coating check
Plating thickness, galvanizing coverage, or passivation quality inspected before packing.
HS Code & Customs Classification
Most fasteners fall under HS Chapter 73 (articles of iron or steel) or Chapter 74/76 for brass and aluminum items — the exact 8-10 digit subheading depends on the specific product and material. We include the HS code on the commercial invoice; confirm the applicable import duty with your customs broker, since rates vary by country and trade agreement.
Packaging & Export Labeling
Export packing is chosen to survive ocean freight and container loading without corrosion or damage: corrosion-protected paper or oil coating where needed, then cartons, drums, or bulk bags, palletized or crated for the container. We can match specific labeling, barcoding, or carton-marking requirements for OEM and repeat buyers.
Countries We Export U-Bolts & J-Bolts To
View all markets →Buying guide
How to Choose a Reliable U-Bolts & J-Bolts Manufacturer, Wholesaler, Supplier & ExporterWhy the inside dimension matters more than the thread size when sourcing custom-formed U-bolts and J-bolts, and how to avoid an ill-fitting bulk order.
Frequently Asked Questions
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