A typical 15 mm pendant sprinkler head weighs about 69 grams, or roughly 0.15 lb, based on product listings for comparable 1/2-inch pendant sprinkler heads. If you mean 1,500 pendant sprinkler heads, the total would be about 103.5 kg, or about 228 lb, using that same per-head weight.

Estimate

  • Per sprinkler head: about 69 g.
  • For 1,500 heads: 1,500×69 g=103,500 g1,500\times 69\text{ g}=103,500\text{ g}1,500×69 g=103,500 g.
  • In kilograms: about 103.5 kg.
  • In pounds: about 228 lb.

Notes

The exact weight can vary by brand, finish, and whether the head is recessed or includes extra parts like an escutcheon. If you meant something different by “15 00,” such as 15.00 oz or a specific model number, that would change the answer.