3M Heavy-Duty Cable Ties CT24_175-L

Yes. The 3M CT24_175-L heavy-duty cable ties are UL Listed 62275 Type 21 or 21S and Plenum Rated AH-2 for use in air handling spaces, so they're acceptable above a plenum ceiling or inside a return air plenum where unrated ties are not.

At 24 inches of overall strap length, the 3M CT24 tie wraps a large bundle - once you allow for the head and the tail you need to grip, the usable circumference is a bit under 24 inches. For trunk cable runs, conduit groups, or bundling to strut, that's the size range it's built for. Tensile strength is 175 lbs.

The operating range on the 3M CT24 ties runs from -40 F to 185 F (-40 C to 85 C), so they hold in unheated attics, parking structures, and cold-climate exterior work. The one thing the temperature rating does not cover is sunlight: choose the black (BK) version for any exposed run, since the natural (NT) nylon is the indoor color.

Not as a direct swap. The 3M CT24_175-L is UL Listed 62275 Type 21 or 21S and plenum rated AH-2 for use in air handling spaces, and it carries a -40 to 185 degree Fahrenheit operating range, so it is the one to specify when the tie sits above a ceiling returning air. The Burndy CTASST is sold as a Unirap cable tie canister variety pack in natural and black, which is a general-purpose assortment for mixed bundling work. For plenum-rated runs, order the 3M CT24_175-L by its rating rather than pulling a tie from an assortment.

No. The CT24 is a one-piece ratcheting nylon tie rated to 175 lbs tensile (79.38 kg), and 3M specifies it to secure wire bundles and harness components without slipping. Once it's pulled down it does not back off, which also means it's a cut-to-remove tie, not a releasable one.

They solve different problems. The 3M CT24_175-L is a single specification tie: 24 in overall length with a 175 lbs tensile strength rating, sold 50 to a package, in natural or black. The Burndy CTASST is a Unirap cable tie canister variety pack supplied in natural and black, so it mixes sizes in one container rather than committing to one length and strength. For a bundle that needs a documented 175 lbs tie at 24 in, specify the 3M CT24_175-L; for a service van or shop drawer that needs an assortment of smaller everyday ties on hand, the Unirap canister pack is the assortment option.

These ship 50 ties per package. For MRO stocking, that's one pack per cart or per panel job rather than a bulk bag quantity, so size your order to the number of bundles on the drawing.

That's the point of the curved tip on the 3M CT24. The tip is pre-curved so it feeds into the head without you having to aim the tail one-handed, which matters on a 24 inch tie pulled around a bundle in a ceiling. 3M states these are made in the USA.