13998SK 64-37 SA 1 M 3 SK64-37,5SA 1XM3SK64-37,5SA 1XM3Fischer and Assmann WSW extruded heatsink series SK and V.
black anodized extruded heatsinks from the manufacturers Fischer and Assmann
suited for TO220 housings
SK 64-37 SA 1 M 3: with one hole and thread M3
V 5583 E: with M3 thread gutter