U-Bolt Pipe Clamp — Double & Single U-Shape Saddle Clamp for Greenhouse & Awning Frames

Measure the outer diameter (OD) of each pipe you need to connect. The clamp size listed (e.g., 3/4" to 1") refers to the OD of the two pipes being joined. For example, a 20mm–32mm clamp fits a 3/4" pipe to a 1" pipe. When in doubt, size up slightly to allow for pipe coating or insulation. A quick conversion: 1" = 25.4mm, so a 1-1/2" pipe = 38.1mm OD (typically listed as 40mm in metric).

The Double U-Shape clamp has two U-bolt saddles that grip two separate pipes simultaneously, making it ideal for joining crossing or parallel pipes at a junction — common in greenhouse hoop frames and awning structures. The single U-Shape clamp secures one pipe to a flat surface or another pipe using a single saddle. Choose Double U-Shape for pipe-to-pipe connections and single U-Shape for pipe-to-surface mounting.

Yes. These clamps are generally suitable for outdoor and greenhouse use. The metal construction typically provides adequate resistance to moisture and light corrosion in covered or semi-exposed environments. For prolonged direct rain exposure, applying a rust-inhibiting coating or choosing a galvanized variant is generally recommended. Contact us to confirm the surface finish of your specific size.

These are saddle-style clamps that grip the pipe's outer diameter — they do not rely on threaded pipe connections. They are compatible with standard round tubing and pipe in the listed OD sizes (20mm–114mm / 3/4"–4-1/2"). No threading or special fittings are required for installation, making them compatible with both NPT and metric pipe systems as long as the OD matches.

Load capacity depends on the clamp size, the pipe material, and the installation method. In most cases, these clamps are designed for structural framing applications such as greenhouse and awning frames where they secure pipe joints against lateral movement and separation. For load-bearing or high-tension applications (e.g., overhead rigging), contact us to confirm suitability before ordering.

Yes — many variants in this listing are specifically designed for reducing connections, such as 1/2" to 1" (20mm to 32mm) or 1" to 2" (32mm to 60mm). Select the size combination that matches your two pipe ODs from the variant dropdown. This eliminates the need for separate reducer fittings in mixed-gauge pipe systems.

The clamp body is included as listed. Fastening hardware (nuts, bolts, or screws) inclusion varies by variant — please check the product images or contact us to confirm what is included with your specific size selection before purchasing.

You can choose to purchase 1, 2, or 5 clamps per order. Multi-pack options offer a lower per-unit cost and are ideal for larger framing projects where multiple connection points are needed — for example, a standard 12'×24' greenhouse hoop frame typically requires 20–40 junction clamps depending on the design.