Part number NAS4123 appears under 4 stock numbers

Manufacturers reuse part numbers across items. Each stock number below is its own federal item record — pick the one your drawing or solicitation cites.

5999-01-209-0658 — HEAT SINK,ELECTRICAL-ELECTRONIC · FSC 5999
5999-01-209-0653 — HEAT SINK,ELECTRICAL-ELECTRONIC · FSC 5999
5999-01-499-0556 — HEAT SINK,ELECTRICAL-ELECTRONIC · FSC 5999
5999-01-436-8300 — HEAT SINK,ELECTRICAL-ELECTRONIC · FSC 5999