Double Groove Trunnion Clamp — Pivoting Pipe Connection

By Nico Yin · Qingdao Zhaoyuqi Machinery Co., Ltd.

Overview

A double groove trunnion clamp is a cast ductile iron pipe clamp featuring two machined or as-cast grooves — typically one on each side or at right angles — that let a bolt, pin, or rod end ride in the groove while the clamp pivots around it. This trunnion action is what separates it from a plain clamp: the connected rod or brace can change angle relative to the pipe as the system moves, loads, or settles, without binding the fastener or prying on the pipe. Typical pipe sizes range from 1/2" through 12" nominal, sized by pipe outside diameter.

Its core use is at the junctions of support systems where forces arrive from more than one direction. A vertical hanger rod may land in one groove while a diagonal sway brace lands in the other, and the double-groove geometry lets each member articulate to its natural angle. That makes the clamp a favored fitting at the tops and bottoms of sway bracing runs, at hanging points where the pipe route turns, and wherever a fixed bolt hole would be overstressed by rotation. The grooves locate the rod axially, resisting slip along the clamp, while the pivot prevents moment loads from feeding into the pipe wall — a combination that prolongs both the fitting and the pipe coating life. Rated loads depend on clamp size and the connected hardware and are confirmed per drawing.

Specifications

Installation & Application

The clamp is placed around the pipe, drawn closed by its bolt, and the rod or pin ends are seated into the grooves. Because the rod locates in the groove rather than a fixed hole, field alignment tolerances are generous. Typical applications include:

• Connection points for sway braces on sprinkler and process piping

• Trunnion points for multi-directional hangers at pipe route turns

• Pivot ends on adjustable support links and tie rods

• Attachment points for equipment tie-downs subject to angular movement

For braced systems, the double groove pairs naturally with a sway brace swivel attachment at the structure end and a pipe hanger flange at the pipe end, completing a fully articulated support chain.

Customization & Sampling

Groove angle, groove width, clamp bore, and bolt pattern are cast and machined to your drawing. We produce matched pin-and-groove sets, widened bodies for heavy bracing, and metric hardware. First-article samples are submitted for groove-fit and dimensional approval.

Quality Inspection & Packaging

Grooves are inspected for width, depth, and position; bodies are dimensionally checked to ISO 8062 and material-verified to the ASTM A536 heat. Galvanized lots are thickness-checked per ASTM A123. Clamps ship with hardware bagged per clamp on export pallets.

FAQ

What is the difference between a single and double groove clamp?

A single groove accepts one rod in one plane; the double groove accepts two connections or allows a second articulation plane, which is why it is preferred where sway braces and hangers meet at one point.

Do the grooves need machining?

For standard hardware fits, as-cast grooves are often sufficient; where pin clearance is tight, we machine the grooves to drawing.

Can it take axial loads along the rod?

Groove geometry resists rod slip under typical bracing loads; specific capacity is confirmed by design and drawing for each application.

Related Products

• Sway Brace Swivel Attachment — swivel end completing the brace connection

• Universal C-Type Clamp — beam attachment for the structure end

• Pipe Hanger Flange — pipe-end hanger in the same chain

• Support Bracket — rigid wall supports for adjacent runs

• Single Pipe Roll — roller support handling axial growth

Get a Quote

Send the pipe size, groove angle, and connected hardware — we confirm the groove design and quote within one business day. WhatsApp: +86 185 6156 7088 for drawings and sample casting.

Need a formal quotation? Send your Double Groove Trunnion Clamp drawing, quantity and target price through our RFQ form — it goes straight to the foundry inbox, and we reply with a priced offer, material certificate draft and production lead time within one business day.