B-Line Eaton series data and low support fasteners, 1/2" diameter hole supports cable from 3/8" or 1/2" threaded rod,, Cable to ATR fastener, Threade

Either one. The BCH64-AB has a 1/2 inch diameter mounting hole, so it slips over both 3/8 inch and 1/2 inch all-thread and is secured with nuts above and below. That is the whole point of the cable-to-ATR design: you hang the rod first, then drop the hook on at whatever height the cable tray or ceiling grid allows.

The hook is rated at 30 lb load capacity, with a single 4 inch J-hook saddle. Size your bundle to the weight, not just the fill: a 4 inch hook has plenty of room for a large Cat6 bundle, but the 30 lb figure is the limit that governs your support spacing.

You supply the threaded rod and the hardware that anchors it. The BCH64-AB is the cable-to-ATR fastener only: one 4 inch J-hook with a 1/2 inch hole for the rod. Add your 3/8 or 1/2 inch all-thread, the nuts to lock the hook at height, and a deck anchor or beam clamp at the top.

Yes, the Eaton B-Line BCH64-AB is UL/CUL listed. It is sold as a datacomm and low voltage cable support, which is what most inspectors and spec writers want to see called out on a communications cable pathway.

The BCH64-AB is steel with a pre-galvanized finish, which is the standard indoor and protected-environment coating. It holds up fine in conditioned ceilings, plenums and typical back-of-house runs. For exposed exterior, coastal, or wash-down environments, specify a stainless or hot-dip galvanized hook instead.

Plan on roughly 7.21 inches of height, 4.223 inches of depth and 2.25 inches of width for the assembly, before you add the threaded rod above it. In tight plenums that height is the number that matters, since the hook body plus the rod nut stack is what has to clear the deck and any duct or pipe crossing above.

Go with the rod-mount hook when you need to drop cable below obstructions or hold a consistent elevation across a bay, because you set the height by where you run the nuts on the all-thread. A beam-clamp or batwing hook attaches directly to structure and is faster where the cable can ride tight to the deck and there is steel or wire to grab. The BCH64-AB is the rod version, 4 inch hook, 30 lb rating.