Round with Plate

About Round U Bolts with Plate

Round U Bolts with Plate are complete pipe-clamp sets: a round-bend U bolt, two matching hex nuts, two washers, a mounting plate with pre-drilled bolt holes and two crimps. The crimps are curved saddles that sit between the plate and the pipe - they stop the plate sliding down the pipe under load and spread the clamping force across a wider arc.

Used to clamp round pipe, tube, conduit or rod to a flat surface without site-fabricating a backing plate. Sold as a single SKU so the plate, U bolt, nuts, washers and crimps are all matched for size and finish. Made to the Inox World Standard in stainless A2-70 G304 for outdoor, food-grade, marine and chemical-exposure use.

How to Measure

Three quick measurements identify any U bolt: inside width (W), leg length (L), then rod diameter and thread pitch.

Step 1 - Inside width (W) With the U bolt sitting on a flat surface, measure the gap between the inside faces of the two legs. Measure across the straight section of the legs, not at the bend - the bend reads a little wider. This is the maximum diameter of pipe, tube or shaft the U bolt will clamp around.

Step 2 - Leg length (L) Measure from the inside crown of the bend down to the end of one leg. This is the length of the U bolt that passes through the backing plate or bracket. Both legs are the same length - measure one. If the cut end is chamfered, measure to the last full thread for the working length.

Step 3 - Rod diameter and thread Measure the diameter of the rod across the unthreaded shank (not the threads - the thread crests sit slightly proud of the rod itself). Match the diameter to a metric size (M6, M8, M10, M12, M16, M20) or an imperial size (1/4", 5/16", 3/8" etc). The thread pitch follows the standard coarse pitch for that diameter (M10 is 1.5mm, M12 is 1.75mm) unless the part is marked otherwise.

Still not sure? See our step-by-step identification guide for help measuring your fastener.

Technical Resources

Every U bolt sub-category has its own CAD drawings and spec PDFs linked at the bottom of its page. For the full library covering U bolts and every other product range we stock, see our Technical PDFs library.

Frequently Asked Questions

Material & Coating

Galvanised Hot-dip galvanised carbon steel. The standard outdoor finish; thick zinc coating gives decades of corrosion resistance. The right choice for trailer chassis, mast and pole mounting, structural pipe clamping and outdoor tank fittings.

Stainless A2-70 G304 - the standard stainless grade. Suits most external Australian environments. Used in food, dairy, mining and general outdoor work. A4-70 G316 (marine grade) adds 2-3% molybdenum to resist chloride attack within 300m of the coast.

Zinc Plated Bright silver electroplated zinc - interior use only. Suits protected industrial applications, indoor pipe clamping and machinery-frame use.

Matching finishes Always match the finish across the assembly. Hot-dip galvanising adds a much thicker coating than zinc plating, so a zinc-plated nut will not wind onto a galvanised bolt, and a galvanised nut on a zinc-plated bolt will be loose. Pair galvanised bolts with galvanised nuts and washers.

Browse our U bolts — Round · Square · Round with Plate · Matching Nuts · Matching Washers

Need help picking a U bolt? Tell us the inside width (W), leg length (L) and diameter you need - we'll match the right SKU. Contact us or call 07 3192 9800.