B-Line 4D21SH-240SS6 Eaton series 4Dimension strut channel

Type 316 stainless. The SS6 suffix on 4D21SH-240SS6 is the type 316 designation, which is the grade specified for coastal, wastewater, food processing and chemical exposure where 304 stainless or galvanized channel corrodes. If your run is indoors and dry, a plain galvanized or pre-galvanized 4D21 channel covers it for less material cost.

The 4D21 is a 1-5/8 inch nominal strut profile at 2.12 inches overall width with a 1.06 inch depth, so it takes the standard 1-5/8 inch strut nuts, clamps and fittings used across the trade. Match the hardware finish to the channel: with type 316 stainless channel, use 316 stainless nuts and bolts, or you give up the corrosion performance you paid for at every connection point.

SH is the slotted hole pattern, punched through the back of the channel the full 240 inch length. It lets you through-bolt the channel to studs, concrete inserts or structural steel anywhere along the run without field drilling, and the slots give you some adjustment when your anchor points do not line up. If you want an unpunched back, that is a different suffix in the 4D21 family.

Order Eaton B-Line 4D21SH-240SS6. It breaks down as 4D21 channel section, SH slotted hole pattern, 240 inch length, SS6 for type 316 stainless. Quote the full string when ordering, since the same 4D21SH profile also exists in other lengths and finishes.

Yes, the 240 inch stick is meant to be cut to length in the field. Cut stainless with an abrasive or carbide blade and deburr the edge. On type 316 material, avoid grinding wheels and brushes that have been used on carbon steel, since embedded iron particles will bloom rust on an otherwise corrosion resistant channel.

20.64 lb per 240 inch stick, roughly 1 lb per foot of run. Useful when you are adding the dead load of the channel itself onto threaded rod and anchor calculations for a long overhead trapeze, and it means a single stick is a one-man carry.