What are Strut Pipe Clamps?
Strut pipe clamps are U-shaped stainless steel brackets that secure pipe, tube, or conduit to a strut (Unistrut-style) channel. The clamp wraps the outside diameter of the pipe and bolts to the channel, creating a rigid, removable support for mechanical, plumbing, and electrical runs.
Which size strut pipe clamp do I need?
Match the clamp to the outside diameter (OD) of your pipe—not the nominal pipe size. For the quickest fit:
- Measure the pipe’s OD with calipers or a tape.
- Select the clamp whose listed size range includes that OD.
- Confirm the channel style (standard Unistrut-style channel) and bolt size your run uses.
Tip: Copper, stainless, and PVC pipes of the same nominal size can have different ODs—always verify OD to avoid rattle or over-tightening.
304 vs 316 stainless steel pipe clamps — what’s the difference?
304 stainless suits most indoor and general outdoor locations. 316 adds molybdenum for stronger pitting and crevice-corrosion resistance around chlorides (coastal air, de-icing salts, wash-down, many chemical or marine settings). Choose 316 when exposure is harsh or continuous.
How do you install a strut pipe clamp?
- Place the pipe on the strut channel and position the clamp over the OD.
- Seat the clamp feet in the channel slot; insert the hardware (spring nut or channel nut plus bolt).
- Align and tighten evenly until snug—secure enough to prevent movement without deforming the pipe or clamp.
Pro note: For thermal expansion runs, follow your spec for fixed vs. guided supports and spacing.
Can strut pipe clamps be used outdoors or in wash-down areas?
Yes. Stainless steel clamps are corrosion-resistant and commonly used outdoors and in sanitary or wash-down spaces. Select 316 for chloride-rich or marine environments.
Are these clamps compatible with Unistrut-style channels?
They are designed for standard strut (channel) framing systems. Verify the channel size and the nut/bolt specification required for your frame before ordering.
Do I need cushioned or insulated clamps for vibration control?
Where vibration, noise, or galvanic isolation is a concern, spec an insulated clamp or add a sleeve as required by your project documents. Follow the engineer’s detail for liner material and temperature rating.
Common applications for strut pipe clamps
- HVAC and hydronic piping
- Plumbing and drain/vent lines
- Process piping and utility lines
- Electrical conduit support on channel framing
Strut Pipe Clamps FAQ
Quick answers to the most asked questions about stainless strut pipe clamps.
What bolt and nut do strut pipe clamps use?
Most mount with a channel (spring) nut and a hex bolt sized to the clamp’s slot. Match the hardware grade and material to the environment and the rest of the frame.
How far apart should strut pipe clamps be spaced?
Follow the governing spec (IPC, MSS, project details, or manufacturer of the pipe). Spacing depends on pipe material, OD, fluid, and temperature—there’s no one-distance-fits-all.
Will a 1" clamp fit 1" nominal pipe?
Only if the clamp’s OD range matches the pipe’s actual outside diameter. Always check the OD chart for your pipe material.
Can I use the same clamp for copper, PVC, and stainless?
Yes, provided the OD matches and galvanic isolation is addressed where dissimilar metals contact. Use an insulated style or barrier where required.