ISO-10303-21; HEADER; /* 5640-01-371-3263 Thermal Insulation Block */ ENDSEC; DATA; /* NSN 5640-01-371-3263 FSC 5640 */ ENDSEC; END-ISO-10303-21; Segal Supply — mock CAD asset SKU: 5640-01-371-3263 Name: Thermal Insulation Block Format: STEP Standards: NSN 5640-01-371-3263, FSC 5640 Generated: 2026-06-18T18:06:07.210Z NOTE: placeholder geometry for demonstration. Production assets stream from the CAD repository behind this same URL with DATA_SOURCE=live.