3M Cable Tie CT15BK50

Yes. The CT15BK50 is plenum rated and UL Listed 62275 Type 21 or 21S with an AH-2 plenum rating for use in air handling spaces, which is the rating an inspector looks for above a lay-in ceiling used as a return plenum.

They are UV resistant nylon 6/6 in black, and 3M lists them as a solution for outdoor longhaul/metro loop network work. Operating range is -40 to 185 degrees F (-40 to 85 C). One limit to watch: minimum installation temperature is -20 C, so in deep cold you can leave them installed but you should not be cinching them in.

They serve different purposes. The 3M CT15BK50 is a single specification: a 14.6 inch long, 0.18 inch wide black Nylon 6/6 tie rated 50 lbs tensile strength, bundling from 1/16 inch up to 4 inch diameter, UL approved and plenum rated for air handling spaces. The Burndy CTASST is a Unirap series canister variety pack containing a mix of natural and black ties in assorted sizes. Use the CT15BK50 when a job calls for one repeatable size and a plenum rating on every tie in the bundle; use the Burndy assortment canister when a service van or shop needs a range of lengths on hand for unplanned work.

Match the rating, not just the size. The 3M CT15BK50 carries a plenum rating for use in air handling spaces along with UL approval, a UL 94 V-2 flammability rating, and a -40 to 185 degree F operating range, which is what an inspector looks for above a return-air ceiling. The Burndy CTASST is a Unirap variety pack of natural and black ties; before substituting it in a plenum, confirm the specific Unirap tie you pull from the canister carries its own plenum rating for that space. For a job where every tie above the grid has to be documented to one rated part number, the CT15BK50 keeps it to a single line item.

The CT15BK50 is a 50 lb tensile strength tie (22.68 kg). That is the loop tensile rating, not a load-bearing suspension rating, so it is sized for holding bundles together and dressing conductors rather than supporting conduit or raceway weight.

Yes, they are listed to MS3367-2-0, the plain nylon cable strap spec, which is what gets called out on a lot of defense and aerospace harness drawings. They also carry a UL 94 V-2 flammability rating and are RoHS 2011/65/EU compliant without exemption.

Two case packs: 500 per case as MPN 7000031857, and 2500 per case as MPN 7000031858. Same tie either way, so for a standardized MRO stockroom the 2500 case is the one to spec; the 500 case suits a single build-out.

It will. The CT15BK50 closes down to a 1/16 inch bundle, so a single small conductor is within range; you just end up trimming a long tail. If you are dressing mostly small bundles and want less waste, a mixed canister like the Burndy CTASST Unirap variety pack gives you shorter lengths in natural and black.

For sun-exposed work, color and UV rating matter. The 3M CT15BK50 is black Nylon 6/6, listed as UV resistant, and identified as a solution for longhaul and metro loop outdoor network applications, so it holds up on exterior runs and in outdoor cabinets. The Burndy CTASST Unirap canister is a variety pack of natural and black ties; the natural ties in that mix are the ones to keep indoors unless their own data confirms UV resistance. If the whole run is outdoors, standardizing on the black CT15BK50 avoids a technician grabbing the wrong color out of a mixed canister.

The 3M CT15BK50 is specified to MS3367-2-0 with a maximum recommended voltage rating of 600 V, a 50 lbs tensile strength, and a 1/16 inch to 4 inch bundle range, which is what a submittal calling out a mil-spec tie is looking for. The Burndy CTASST is a Unirap series assortment canister of natural and black ties and is the stock-the-truck option rather than a single spec-matched part number. When a drawing names a mil spec, order the CT15BK50 so the part number on the submittal matches the part number in the panel.

3M gives a maximum recommended voltage rating of 600 V for the CT15BK50, which covers standard commercial branch circuit and feeder work. Above 600 V, look for a tie specifically rated for the application.

3M lists a manufacturing origin of USA for the CT15BK50 and a country of origin of Honduras. If you are bidding a job with domestic sourcing language, get the origin confirmed against the specific case you are buying before you certify it.