U-Bolts

U-Bolts for Australian Pipe Mounting, Suspension and Structural Fastening

U-bolts are the U-shaped threaded fasteners used to secure pipes, cables, structural members, and suspended equipment around bars, tubes, and other components that don't accept conventional bolted fastening. The U-shape passes around the held component, with both threaded ends extending through a mounting plate where nuts secure the assembly. For Australian plumbing, vehicle suspension, structural, and industrial mounting applications, U-bolts are essential. AIMS Industrial supplies U-bolts in metric and imperial sizes across the materials and bend types Australian customers use.

The U-bolt types we stock

• Round-bend U-bolts — semicircular bend; for round pipe and tube mounting
• Square-bend U-bolts — rectangular bend; for square section, channels, and rectangular tubes
• Long-shank U-bolts — extended threaded shanks for thicker mounting plates
• Heavy-duty U-bolts — larger diameter for higher-load applications
• U-bolt assemblies — pre-matched U-bolt with mounting plate and nuts

Materials and finishes

• Galvanised steel — the standard for outdoor and corrosive environments
• Zinc-plated steel — for indoor and protected applications
• Stainless steel 304 and 316 — for marine, food-grade, and aggressive corrosive applications
• Black self-colour steel — for paintable applications and indoor structural use

Where U-bolts earn their place

• Pipe mounting — securing pipework to walls, ceilings, and structural members
• Vehicle suspension — leaf spring U-bolts secure axles to springs in trucks, trailers, agricultural equipment
• Cable and conduit support — large-diameter cable and conduit fastening
• Equipment suspension — hanging tanks, machinery, and equipment from structural members
• Marine and outdoor applications — stainless U-bolts in saltwater and corrosive environments
• Antenna and signage mounting — securing antennas and signs to poles
• Custom fabrication — wherever a wraparound fastening is needed

Sizing — match to the component being held

U-bolt sizing has two main dimensions: the thread diameter (the threaded shank size) and the inside dimension (the diameter of pipe or width of section the U-bolt fits around). Common metric thread sizes range from M6 through M30; inside dimensions range from 12mm through 200mm depending on application. Match both dimensions — undersized inside dimension can't fit around the component; oversized leaves the component loose in the U-bolt.

Working load capacity

U-bolt working load capacity depends on the thread size, material grade, and mounting plate stiffness. For structural applications, U-bolts are typically rated as a system (U-bolt plus mounting plate plus nuts) rather than as individual components. Manufacturer data sheets give the working load for specific configurations. For lifting applications, U-bolts must be rated lifting components and supplied with traceable documentation — generic structural U-bolts aren't rated for lifting use.

Vehicle suspension U-bolts

Leaf spring U-bolts for trucks, trailers, and agricultural equipment are typically supplied as matched assemblies with the bolt, top plate, and nuts pre-matched for the spring stack thickness. Re-torquing is standard practice for new installations — torque after first 100km of operation, then periodically to maintain the specified preload. Loose U-bolts on vehicle suspension cause spring shift and serious safety issues.

Brands stocked at AIMS

Hobson and Bremick cover the U-bolt range across the standard sizes, materials, and finishes. For specialty U-bolts (large dimensions, specific OEM patterns, vehicle-specific assemblies), sourcing through our distribution channels covers most options.

Companion ranges at AIMS

U-bolts sit alongside our broader fastener range — see turnbuckles, rope grips, cable and conduit saddles, and structural bolt assemblies for the related products.

Need help speccing U-bolts for pipe mounting, vehicle suspension, or structural application? contact our team — we'll match by thread size, inside dimension, and material.