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strut channels, often referred to as Kindorf or Unistrut, are standardized structural systems used in the construction and electrical industries for supporting wiring, plumbing, and mechanical components. They consist of a cold-formed metal U-shape with inward-curving lips that provide a continuous mounting point for specialized nuts, bolts, and brackets, allowing for a completely modular support network without the need for welding.
A standard strut channel is typically manufactured from 12-gauge or 14-gauge steel. The "U" shape profile features a series of holes (slotted) or a solid back, depending on the mounting requirements. To ensure longevity in various environments, these channels are available in several finishes:
Understanding how strong a strut channel is requires looking at its beam loading and column loading data. The strength is determined by the "depth" of the channel; the most common size is 1-5/8" x 1-5/8", though "shallow" channels (1-5/8" x 13/16") are used for lighter loads.
| Channel Profile | Span (Inches) | Max Uniform Load (Lbs) |
| Standard (1-5/8" x 1-5/8") 12ga | 24" | 1,690 lbs |
| Standard (1-5/8" x 1-5/8") 12ga | 48" | 850 lbs |
| Shallow (1-5/8" x 13/16") 14ga | 24" | 580 lbs |
Note: These values are based on a safety factor of 1.67 and assume a simple span beam configuration. Always consult manufacturer-specific load tables for safety-critical installations.
The versatility of the strut channels system makes it the "Lego" of industrial construction. Because the channel serves as a continuous mounting track, it is used for:
Connecting strut channels efficiently is what gives the system its modularity. Connection methods vary based on whether the joint is a linear extension or a 90-degree intersection.
| Connection Type | Required Hardware | Technical Function |
| End-to-End (Splicing) | External Splicer or Internal Coupler | Extends the length of a run while maintaining axial alignment. |
| 90-Degree Angle | L-Brackets (2-hole or 4-hole) | Creates rigid corners for frames or equipment racks. |
| T-Intersection | Flat Plate Tee Brackets | Connects a vertical support to a horizontal header. |
The core of every connection is the channel nut (strut nut). These nuts feature grooves that "bite" into the inward-curving lips of the channel when tightened. For ease of installation, many technicians prefer "spring nuts," which hold themselves in place within the channel, allowing for one-handed bolting of brackets or accessories.
When cutting strut channels to length, it is vital to deburr the edges to prevent damage to electrical cables and to apply cold-galvanizing spray to the cut ends to prevent rust. When tightening bolts, aim for a torque value of approximately 50 ft-lbs for a 1/2" bolt to ensure the channel nut fully engages with the steel lips without deforming the channel walls.
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