What is a half coupler (Halbschelle / halfcoupler)?

A half coupler, also called a halfcoupler or half clamp, is a rigging clamp that wraps around roughly one half of a round truss tube and is tightened with a wing nut or bolt. On the opposite side it carries an M10 device screw or an eye bolt to attach a single fixture, bracket, speaker or accessory directly to the tube. Half couplers are core event-technology hardware, are load-rated and typically TÜV tested, and are often used in pairs to spread the working load limit across two clamping points for heavier loads.

What is the difference between a half coupler and a double coupler (full clamp)?

The difference between a half coupler and a double coupler lies in what they connect. A half coupler fixes a device, bracket or accessory to a single truss tube via an M10 device screw or eye bolt. A double coupler, or full clamp, joins two tubes together at a fixed or swivelling angle and is used to build truss grids and cross-bracing. In short: a half coupler attaches a device to a tube, while a double coupler attaches a tube to a tube. Choose the half coupler for hanging fixtures and the double coupler for structural tube connections.

Which half coupler fits a 25mm tube?

For a tube of around 25 mm, choose a half coupler whose clamping range covers that diameter. In event technology the closest standard ranges are the 20 mm coupler for small tubes such as Junior-Truss and Naxpro FD14, and the 32–35 mm coupler for slim main chords. Always measure the exact outer diameter of your tube with a caliper first, because a 25 mm tube sits between two standard ranges. Select the coupler whose stated clamping range actually encloses your measured diameter, and never force a clamp onto a tube it is not rated for.

Which half coupler fits a 50mm tube?

For a 50 mm tube – the industry-standard truss diameter – choose a half coupler with a 48–51 mm clamping range. These couplers are available in tensile ratings from 100 kg for standard versions, around 200 kg for narrow builds, up to 500 kg for wide versions and up to 750 kg for heavy-duty models, with maximum shear loads between 30 kg and 100 kg. This 48–51 mm range fits Naxpro-Truss FD31–44 and HD31–44 systems as well as most other 50 mm truss brands. Pick galvanized, black-coated or stainless steel depending on your event environment.

Which Riggatec half coupler fits a 60mm tube?

For a 60 mm tube, choose the Riggatec heavy-duty half coupler rated for a 60 mm tube diameter, available in silver galvanized and black. This coupler carries a tensile load of up to 750 kg and a maximum shear load of 100 kg, with a weight of around 0.7 kg. It suits heavy rigging tasks and large systems such as the Naxpro-Truss GS94 series, which uses a Ø 60 mm chord. As with all rigging clamps, stay within the stated working load limit and use couplers in pairs for long or heavy loads.

Which Riggatec half coupler fits a 40mm tube?

For a tube of around 40 mm, choose a Riggatec half coupler whose clamping range encloses that diameter. The nearest standard event-technology ranges are the 32–35 mm coupler and the 48–51 mm coupler, so a 40 mm tube falls between them. Measure the exact outer diameter of your tube with a caliper before ordering, then select the coupler whose stated clamping range genuinely covers your measurement. Never force a half coupler onto a tube outside its rated range, because it will not clamp securely and the load rating no longer applies.

Is there a half coupler with an eye bolt?

Yes, there is a half coupler with an eye bolt. This variant replaces the standard M10 device screw with a welded or bolted M10 ring eye (C15E), creating a defined suspension point on the truss tube. It is used to attach shackles, safety cables or hoist connections for hanging points in rigging. Eye-bolt half couplers are available for 32–35 mm and 48–51 mm tubes in silver and black, with tensile ratings such as 75 kg, 170 kg or 500 kg depending on the model. They are a key part of the Riggatec accessories range for building safe overhead suspension points.

What load can a half coupler carry?

A half coupler carries two separate load figures. The tensile load acts vertically along the device screw and reaches up to 10 kg on 20 mm tubes, 75 kg on 32–35 mm tubes, 100 kg on standard 48–51 mm tubes, and up to 750 kg on heavy-duty builds for 48–51 mm and 60 mm tubes. The shear load acts sideways and is always lower – typically 30 kg for light couplers, 40 kg for narrow versions and up to 100 kg for heavy-duty models. Always respect both the stated tensile and shear working load limits, use TÜV-tested couplers and mount them in pairs for long or heavy loads.

Half couplers

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Riggatec Halbschelle - Halfcoupler klein silber bis 100 kg (48 - 51 mm)

Riggatec half couplers - Small, Silver, up to 100 kg (48–51 mm)

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