PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

DDT741Tubing,glass

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 6640-00-551-9803 · FSC 6640 · No Item Name Available
Verified by PartsTable
NSN 6640-00-551-9803 — this item is cataloged by the U.S. Government under National Stock Number 6640-00-551-9803. Primary manufacturer part number: DDT741.
Features
  • Tubing,glass — FSC 6640
  • Nondefinitive Spec/std Data: 1 TYPE
  • Surface Finish: FIRE FINISH
  • Material: GLASS BOROSILICATE
  • Style Designator: TUBING
  • Material Transparency: CLEAR
  • Wall Thickness: 1.200 MILLIMETERS NOMINAL MM
  • Overall Diameter: 18.000 MILLIMETERS NOMINAL MM
Applications
  • Applications requiring Glass Borosilicate construction
General Description

The Tubing,glass, cataloged under National Stock Number 6640-00-551-9803, is classified within Federal Supply Class 6640 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 8 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. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6640-00-551-9803
Primary Part NumberDDT741
Item NameTubing,glass
FSC / FSG6640 / 66 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusCANCELLED
Nondefinitive Spec/std Data1 TYPE
Surface FinishFIRE FINISH
MaterialGLASS BOROSILICATE
Style DesignatorTUBING
Material TransparencyCLEAR
Wall Thickness1.200 MILLIMETERS NOMINAL MM
Overall Diameter18.000 MILLIMETERS NOMINAL MM
Bore Diameter15.600 MILLIMETERS NOMINAL MM
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 3
6640-00-245-7128 INTERCHANGEABLE
Tubing,glass
6640-00-550-6768 INTERCHANGEABLE
Tubing,glass
6640-00-551-9799 INTERCHANGEABLE
Tubing,glass
Cross-Reference Index
Part NumberManufacturer
DDT741 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
6640-00-245-7128INTERCHANGEABLE
TUBING,GLASS
6640-00-550-6768INTERCHANGEABLE
TUBING,GLASS
6640-00-551-9799INTERCHANGEABLE
TUBING,GLASS

Frequently Asked Questions

What is NSN 6640-00-551-9803?

NSN 6640-00-551-9803 is a Tubing,glass, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 6640 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6640-00-551-9803?

NSN 6640-00-551-9803 has 1 cross-referenced part number: DDT741 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 6640-00-551-9803?

There are 3 known substitutes for 6640-00-551-9803: 6640-00-245-7128, 6640-00-550-6768, 6640-00-551-9799. Verify interchangeability with system specifications before substitution.

What are the specifications of DDT741?

Key specifications for DDT741: Nondefinitive Spec/std Data: 1 TYPE; Surface Finish: FIRE FINISH; Material: GLASS BOROSILICATE; Style Designator: TUBING. 9 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6640-00-551-9803 still in active supply?

NSN 6640-00-551-9803 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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