PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4LDFlask,dewar

Union Carbide Corp Sub of Dow Co the · NSN 6640-01-377-7204 · FSC 6640 · No Item Name Available
Verified by PartsTable
NSN 6640-01-377-7204 — this item is cataloged by the U.S. Government under National Stock Number 6640-01-377-7204. Primary manufacturer part number: 4LD.
Features
  • Flask,dewar — FSC 6640
  • Criticality Code Justification: ZZZY
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
  • 1 verified cross-reference
  • Primary manufacturer: Union Carbide Corp Sub of Dow Co the
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Flask,dewar, cataloged under National Stock Number 6640-01-377-7204, is classified within Federal Supply Class 6640 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Union Carbide Corp Sub of Dow Co the. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6640-01-377-7204
Primary Part Number4LD
Item NameFlask,dewar
FSC / FSG6640 / 66 — No Item Name Available
ManufacturerUnion Carbide Corp Sub of Dow Co the
StatusACTIVE
Criticality Code JustificationZZZY
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5660-00-913-1526BA-T7 INTERCHANGEABLE
Cap,post
Cox Fence Fittings Co
Cross-Reference Index
Part NumberManufacturer
4LD Union Carbide Corp Sub of Dow Co the (USA)
Related Parts
5660-00-913-1526INTERCHANGEABLE
CAP,POST
BA-T7

Frequently Asked Questions

What is NSN 6640-01-377-7204?

NSN 6640-01-377-7204 is a Flask,dewar, manufactured by Union Carbide Corp Sub of Dow Co the, classified under FSC 6640 (No Item Name Available). Status: active.

What are the part numbers for NSN 6640-01-377-7204?

NSN 6640-01-377-7204 has 1 cross-referenced part number: 4LD (Union Carbide Corp Sub of Dow Co the).

What NSN replaces 6640-01-377-7204?

There is 1 known substitute for 6640-01-377-7204: 5660-00-913-1526. Verify interchangeability with system specifications before substitution.

What are the specifications of 4LD?

Key specifications for 4LD: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS. 2 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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