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Unistrut Channel SizesMonday, November 13, 2017

With so many available sizes, hole, material, and finish options, selecting the best Unistrut channel for your application may seem like a daunting task.  

Describing each possible strut permutation  explains why the Unistrut Engineering Catalog has grown to 240 pages--and why some folks get confused.   In this post, we go back to the basics and focus on channel size as the starting point when developing your selection criteria. 

Each section of Unistrut channel has four dimension attributes:  length, width, height, and wall thickness. 

Out of these variables, length is probably the easiest place to start.  The vast majority of Unistrut channel sections come in 10’ and 20’ lengths.  We should also note that stock length sections are always the most expensive to ship, so if you are certain your application calls for 5 foot sections, for example, it makes more sense to utilize our cutting service rather than shipping full 10’ or 20’ lengths of stock channel.Channel width is the next dimension  to consider. The Unistrut Engineering Catalog's table of contents features three different channel widths, or series, from which to choose:  1-5/8”, 1-1/4” (sometimes referred to as the A-series), and the miniature, 13/16” series.  The heavy-duty, 1-5/8” series is our most popular channel style, and as such, you’ll have the largest selection of channel and fittings options.    The 13/16” series (19 gauge, half reduction of the 1-5/8” channel) is designed for the lighter loads (e.g., instrumentation, retail displays, and light duty laboratory applications).Each channel series is manufactured in multiple heights (including welded, back to back combinations) and different wall thickness.  For example, P1000 and P1100 possess the same width and height dimensions (1-5/8” x 1-5/8”), but different wall thicknesses (12 gauge versus 14 gauge).We should add one final disclaimer before turning to the sizing charts below—items denoted with an asterisk are run in low volumes at our mill.  For this reason, take care when specifying these items and be sure to inquire about availability and lead times.

1-5/8" Series Single Section Channel Selection Chart*
Channel Width Height Steel
Gauge
Stainless Steel
Gauge
Aluminum
P1000 1-5/8" 1-5/8" 12 ga 12 ga 0.109"
P1100** 1-5/8" 1-5/8" 14 ga 14 ga NA
P2000** 1-5/8" 1-5/8" 16 ga NA NA
P3000 1-5/8" 1-3/8*" 12 ga NA NA
P3300 1-5/8" 7/8" 12 ga 12 ga NA
P4000 1-5/8" 13/16" 16ga 16 ga** 0.078"**
P4100 1-5/8" 13/16" 14 ga NA NA
P4400** 1-5/8" 1" 12 ga NA NA
P4520** 1-5/8" 13/16" 12 ga NA NA
P5000 1-5/8" 3-1/4" 12 ga 12 ga NA
P5500 1-5/8" 2-7/16" 12 ga NA 0.109"
*Hole, slot, and knock-out configurations available. Refer to Unistrut Engineering Catalog for more information,
**Available by special order only. Contact Unistrut Service Company for details.
1-5/8" Series Back-to-Back Channel Selection Chart*
Channel Width Height Steel
Gauge
Stainless Steel
Gauge
Aluminum
P1001 1-5/8" 3-1/4" 12 ga 12 ga 0.109"
P1101** 1-5/8" 3-1/4" 14 ga 14 ga NA
P2001** 1-5/8" 3-1/4" 16 ga NA NA
P3001 1-5/8" 2-3/4" 12 ga NA NA
P3301 1-5/8" 1-3/4" 12 ga 12 ga NA
P4001 1-5/8" 1-5/8" 16ga 16 ga** 0.078"**
P4100 1-5/8" 1-5/8" 14 ga NA NA
P4401** 1-5/8" 2" 12 ga NA NA
P4521** 1-5/8" 1-5/8" 12 ga NA NA
P5001 1-5/8" 6-1/2" 12 ga 12 ga NA
P5501 1-5/8" 4-7/8" 12 ga NA 0.109"
*Hole, slot, and knock-out configurations available. Refer to Unistrut Engineering Catalog for more information,
**Available by special order only. Contact Unistrut Service Company for details.
1-1/4" A Series Channel Selection Chart
Channel Width Height Steel
Gauge
Stainless Steel
Gauge
Aluminum
A1000 1-1/4" 1-1/4" 14 ga NA 0.075"
A1001 1-1/4" 2-1/2" 14 ga NA NA
A3300 1-1/4" 3/4" 14 ga NA NA
A3001 1-1/4" 1-1/2" 14 ga NA NA
13/16" Series Channel Selection Chart
Channel Width Height Steel
Gauge
Stainless Steel
Gauge
Aluminum
P6000 13/16" 13/16" 19 ga 19 ga 0.040"
P6001 13/16" 1-5/8" 19 ga NA 0.040"
P7000 13/16" 13/32" 19 ga NA 0.040"
P7001 13/16" 13/16" 19 ga NA 0.040"

Parting Thoughts

As earlier mentioned, size is just one of the many considers when selecting the right channel for your application.  Hole patterns, finish, and material selection are also important, but selecting from one of the three channel series featured above is a great way to start narrowing down choices.  For many applications, you'll also want to consult the load tables found in the Unistrut Engineering Catalog to ensure the selected channel is appropriate for your application. To learn more about Unistrut Channel, or to request pricing and availability, contact Unistrut Service Company for further assistance.