Thomas & Betts TY400-120X-50 CBL TIE 120LB 15IN UV BLK NYLON

The TY400-120X-50 closes on bundles up to 4 inches (101.6 mm) in diameter. The strap itself is 14.75 inches long, so once you account for the wrap and the tail through the head, 4 inches is the working limit. For larger cable bundles or conduit runs, step up to a longer tie rather than trying to chain two together.

Yes. The TY400-120X-50 is the UV-stabilized black version, which is what you want for exterior runs, rooftop conduit, solar racking, and anything exposed to sunlight. The natural (undyed) nylon ties are indoor-only and will chalk and crack outdoors. Material is nylon/polyamide 6.6.

120 lb (540 N) is the minimum loop tensile strength, meaning the force the closed loop resists before failure, not a rated load for suspending equipment. Strap section is 0.299 inches wide by 0.075 inches thick. For bundling heavy feeder cable, harnesses, or securing gear against vibration, that 120 lb class is the heavy-duty end of general purpose ties.

Plastic pawl. The whole tie, head included, is nylon 6.6 with no stainless barb. That keeps it non-conductive and avoids any galvanic concern against aluminum or copper, but it also means it will not bite as hard on very smooth or slick jacketing as a metal-tongue tie. If you need the metal barb, specify a stainless-pawl tie instead.

Selling unit of measure is each. The -50 in the part number is the manufacturer's series suffix, not a pack count, so order the quantity you actually need rather than assuming a bag.

For bundling, yes, up to 4 inches of bundle diameter. Understand what it is though: a general purpose nylon tie rated 120 lb loop tensile, not a support device. Codes generally require metallic or listed supports for conduit and cable support; use these for dressing, harnessing, and bundling alongside proper hangers.