Strut Beam Clamps
A beam clamp attaches threaded rod, strut, or pipe to the flange of a steel beam without drilling or welding. The jaws grip the flange and a set screw or bolt locks the clamp in place, giving you a fast, removable structural connection point overhead. Eugene Fastener & Supply stocks the full beam clamp range: light, medium, and heavy-duty I-beam clamps, universal and wide-throat malleable clamps, steel and malleable C-clamps, window (top-beam) clamps, and U-bolt beam clamps, in rod sizes from 1/4" through 3/4" and flange capacities to match.
These clamps fit Unistrut and other standard strut and rod-hanging systems, so a competitor part number almost always has an EFS equivalent. Buy by the piece or the carton, with same-day shipping on orders placed before 2pm Pacific.
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Strut Beam Clamps — Hang From Steel Without Drilling
Need beam clamps for a rod-hanging job, pipe support run, or volume order?
Request Project Pricing Email Sales
Tell us rod size, beam flange thickness, load, and quantity for the fastest quote.
What Is a Beam Clamp?
A beam clamp is a mechanical fastener that grips the flange of a steel I-beam, wide-flange, or channel and gives you an attachment point for threaded rod, strut, or pipe. Because it clamps rather than drills or welds, it installs fast, leaves the steel intact, and can be repositioned. Beam clamps are the standard way to hang sprinkler lines, conduit, cable tray, HVAC, and pipe supports from building steel.
Choosing a Beam Clamp
Three decisions: what you are hanging, the beam flange thickness, and the load.
| Clamp Type | Best For | Notes |
|---|---|---|
| Universal / Wide-Throat Malleable | Threaded rod drops from a beam flange | Malleable iron, the everyday rod-hanging clamp. Wide-throat fits thicker flanges. |
| I-Beam Clamp (light / med / heavy) | Rod or strut from standard beam flanges up to 7/8" thick | Pick the duty rating to the load. Heavy duty for larger rod and higher load. |
| Steel / Malleable C-Clamp | Quick rod attachment with a locknut | C-shape with a cup-point set screw; malleable for higher strength. |
| Window / Top-Beam Clamp | Attaching to the top of a flange or a purlin | For situations a standard jaw clamp cannot reach. |
| U-Bolt Beam Clamp | Securing strut across a beam | Wraps the flange with a U-bolt for a strut crossover. |
I-Beam Clamp Sizes (up to 7/8" Flange)
Our rod-hanging I-beam clamps, electro-galvanized, by rod size and duty. Click any size to buy.
| Rod Size | Duty | EFS SKU |
|---|---|---|
| 1/4" | Medium | STR4815 |
| 3/8" | Medium | STR4816 |
| 3/8" | Heavy | STR4817 |
| 1/2" | Medium | STR4818 |
| 1/2" | Heavy | STR4819 |
| 5/8" | Medium | STR4820 |
| 5/8" | Heavy | STR4821 |
| 3/4" | Heavy | STR48213 |
Also stocked: universal beam clamp STR4804, I-beam / strut clamp STR4809, window clamp STR4810, and 3/4" beam clamp STR4812. Universal and wide-throat malleable C-clamps are stocked in 3/8" through 3/4" — request a quote or call for the size you need.
Brand Cross-Reference
Our beam clamps cross-reference to the major strut brands (full chart on our strut cross-reference page):
| EFS SKU | Description | Unistrut | PowerStrut | B-Line | Superstrut |
|---|---|---|---|---|---|
| STR4804 | Universal beam clamp | P1386 | PS 686 | B355 | 512-U |
| STR4809 | I-beam / strut clamp | P1379S | PS 685 | B211 | U510 |
| STR4810 | Window beam clamp | P1796S | PS 855-1 | B314 | A-597 |
| STR4815 | 1/4 medium I-beam clamp | P1648S | PS 858 1/4 | B303 | U560 1/4 |
| STR4818 | 1/2 medium I-beam clamp | P1650AS | PS 858 1/2 | B307 | U-560-1/2 |
Brand names are used for identification only. Eugene Fastener supplies equivalent parts and is not affiliated with these manufacturers.
Finishes
- Electro-galvanized / plain: standard for interior structural and mechanical work.
- Malleable iron: higher strength for medium and heavy-duty rod hanging.
- Stainless / hot-dip: available on request for corrosive or exterior environments.
Frequently Asked Questions
What is a beam clamp used for?
A beam clamp grips the flange of a steel beam to create an attachment point for threaded rod, strut, or pipe, without drilling or welding the steel. It is the standard way to hang sprinkler pipe, conduit, cable tray, HVAC, and pipe supports from building structure. Because it clamps on, it installs quickly and can be removed or repositioned.
Do beam clamps require drilling or welding?
No. That is the point of a beam clamp. The jaws grip the existing flange and a set screw or bolt locks it, so the steel is never drilled or welded. This keeps the structural member intact and makes installation much faster.
How do I choose the right beam clamp?
Decide three things: what you are hanging (threaded rod, strut, or pipe), the thickness of the beam flange the clamp must grip, and the load. For rod hanging, match the clamp rod size to your threaded rod (1/4 to 3/4 inch) and choose a duty rating, light, medium, or heavy, to suit the load. Confirm the clamp flange capacity covers your beam flange thickness.
What is the difference between a beam clamp and a C-clamp?
A C-clamp is one common style of beam clamp, shaped like the letter C with a cup-point set screw and usually a locknut, used for quick rod attachment. Other beam clamp styles include universal malleable clamps, I-beam jaw clamps, and window clamps for the top of a flange. All grip a beam; the C-clamp is the simplest set-screw version.
What is the difference between malleable and steel beam clamps?
Malleable iron clamps are cast and have higher strength, used for medium and heavy-duty rod hanging. Steel clamps are formed and work well for lighter loads. For higher loads or larger rod, choose the malleable version.
What size beam clamp do I need for my flange?
Check the clamp flange capacity against your beam flange thickness. Our standard I-beam clamps cover flanges up to 7/8 inch; wide-throat malleable clamps handle thicker flanges. If your flange is unusually thick, ask us and we will match a clamp to it.
Do beam clamps fit Unistrut?
Yes. Our beam clamps cross-reference to Unistrut and other standard strut and rod-hanging systems. For example our universal beam clamp matches Unistrut P1386. See the cross-reference table above.
More Strut Accessories at Eugene Fastener: pipe & conduit clamps, channel nuts, strut channel, brackets & braces, and the full strut & accessories category.
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