B-Line Eaton series data and low support fasteners, Support bar for BCH21 and BCH32 8-1/4" long with .281Ø holes, Multi-tier cable hook kit, 6063-T6

The BCH-HB21 is the mounting bar that lets you stack J-hooks instead of running one hook per pathway. It is an 8-1/4 inch aluminum bar with .281 diameter holes, and the hooks bolt through those holes so you can carry separate tiers of low voltage and data cable off one anchor point. The bar itself is the backbone; the hooks are the part that cradles the bundle.

It is made for the BCH21 and BCH32 hooks at the 8-1/4 inch length. Those are the hooks the .281 diameter hole spacing on the bar is drilled for. Other hook series are not called out for this bar, so if you are running a different hook family, match the bar to that family instead.

What you are ordering under BCH-HB21 is the support bar itself, the 8-1/4 inch bar with the .281 diameter holes. The BCH21 or BCH32 hooks that mount to it are separate line items, as is whatever you attach the bar to the structure with. Order the bar, the hook quantity per tier, and your attachment method together so the run is complete on the first delivery.

Yes, it carries a UL/CUL listing, which is what an inspector on a commercial or institutional job will look for on the support hardware in a plenum or open-ceiling cable run. That listing covers both US and Canadian requirements.

8.25 inches on the long axis, with a .465 inch width and a 1.965 inch length/depth figure. The thin cross section is what lets it sit tight against a beam clamp or threaded rod bracket without eating headroom in a congested ceiling.

Separation. Structured cabling standards and most IT groups want data kept off the power and off other low voltage systems, and a tiered bar gives you two or more discrete pathways from a single attachment instead of drilling and anchoring for each one. It also keeps future adds tidy: an empty tier is where the next pull goes. If you only have one bundle and no plan to segregate, a single hook is simpler and there is no reason to add the bar.

For facilities standardizing on the B-Line BCH21 or BCH32 hook, yes, the HB21 bar is the 8-1/4 inch tier bar in that system and it is UL/CUL listed, which is usually the requirement written into institutional and healthcare specs. Standardizing on one bar and one hook size means one stock number for every riser closet and corridor run instead of a mixed bag of brackets.

The bar is 6063-T6 aluminum, an extrusion alloy that forms its own oxide layer rather than rusting the way plain steel does. That makes it a reasonable pick for humid mechanical rooms, kitchens and parking structures where a bare steel bracket would streak. It is not stainless, so continuous salt spray or chemical exposure is a different conversation.

Each bar is .215 lb. Even on a long run at standard hook spacing, the bars themselves contribute very little to the hanging load compared with the cable bundle, which is the point of using a light extruded aluminum bar rather than formed steel. Size your anchors around the cable weight.