B-Line 4D22SH-120PLN Eaton series 4Dimension strut channel

No. The 4D22SH-120PLN is plain finish steel, meaning bare uncoated mill steel with no zinc or paint on it. It will surface rust in any wet, humid, or exterior location. Use it indoors in dry, conditioned space, or where it gets painted after install. For exterior, parking structures, wash-down areas, or unconditioned mechanical rooms, specify a pre-galvanized or hot-dip galvanized version of the same 4D22 channel.

It is 18 gauge steel. That is a lighter wall than the 12 gauge strut usually called out for heavy pipe racks and primary trapeze supports. 18 gauge 4D22 suits lighter duty work: conduit runs, small pipe, cable tray hangers, equipment bracing, and general mounting. If the drawing specifies 12 gauge channel, this is not a substitute.

SH is the slotted hole pattern, so the channel comes pre-punched in the back rather than solid. That lets you bolt the run straight to structure or to other channel without field drilling, and the slots give you some adjustment along the length when you are lining up a rack or trapeze. If you want an unpunched back for a continuous clean face, you need a solid-back 4D22 instead.

The 4D22 is a 2.12 inch square profile, which is the back-to-back size rather than the single 1-5/8 inch channel most common strut nuts are sized to. Match your nuts, clamps, and fittings to the 4D22 profile from the same 4Dimension series so the nut seats correctly in the lip. Mixing in hardware cut for a different channel size is the usual cause of nuts that spin or will not turn into the slot.

Order Eaton B-Line part number 4D22SH-120PLN. The number reads out as the channel type 4D22, SH slotted hole pattern, 120 inch length, and PLN plain finish. If you need a different length or a galvanized finish, only the suffix changes, so the 4D22SH portion stays the same.

Yes. Being 18 gauge plain steel, the channel cuts easily with a bandsaw, chop saw with a metal blade, or portaband. Since the finish is plain and uncoated, there is no galvanizing to touch up, though any cut end should be treated the same as the rest of the stick: keep it dry or paint it. The SH slotted pattern means your cut point may land mid-slot, so lay out the run against the hole spacing before cutting.