PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4003-27O-Ring

Epsco Inc · NSN 5331-01-206-7850 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-206-7850 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-206-7850. Primary manufacturer part number: 4003-27.
Features
  • O-Ring — FSC 5331
  • Cross-Sectional Height: 0.133 INCHES NOMINAL IN
  • Material: PLASTIC POLYTETRAFLUOROETHYLENE
  • 2 verified cross-references
  • Primary manufacturer: Epsco Inc
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Plastic Polytetrafluoroethylene construction
General Description

The O-Ring, cataloged under National Stock Number 5331-01-206-7850, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Epsco Inc. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5331-01-206-7850
Primary Part Number4003-27
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerEpsco Inc
StatusACTIVE
Cross-Sectional Height0.133 INCHES NOMINAL IN
MaterialPLASTIC POLYTETRAFLUOROETHYLENE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5950-00-647-6880400327 INTERCHANGEABLE
Transformer,power
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5996-01-103-0394400327 INTERCHANGEABLE
Amplifier,audio Frequency
Dictaphone Corporation
5930-01-612-7418400327 INTERCHANGEABLE
Boot,dust and Moisture Seal
Stinar, Llc
Cross-Reference Index
Part NumberManufacturer
4003-27 PRIMARY Epsco Inc (USA)
ES1075-27 Drs Sustainment Systems, Inc. (USA)
Related Parts
5950-00-647-6880INTERCHANGEABLE
TRANSFORMER,POWER
400327
5996-01-103-0394INTERCHANGEABLE
AMPLIFIER,AUDIO FREQUENCY
400327
5930-01-612-7418INTERCHANGEABLE
BOOT,DUST AND MOISTURE SEAL
400327

Frequently Asked Questions

What is NSN 5331-01-206-7850?

NSN 5331-01-206-7850 is a O-Ring, manufactured by Epsco Inc, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-206-7850?

NSN 5331-01-206-7850 has 2 cross-referenced part numbers: 4003-27 (Epsco Inc), ES1075-27 (Drs Sustainment Systems, Inc.).

What NSN replaces 5331-01-206-7850?

There are 3 known substitutes for 5331-01-206-7850: 5950-00-647-6880, 5996-01-103-0394, 5930-01-612-7418. Verify interchangeability with system specifications before substitution.

What are the specifications of 4003-27?

Key specifications for 4003-27: Cross-Sectional Height: 0.133 INCHES NOMINAL IN; Material: PLASTIC POLYTETRAFLUOROETHYLENE. 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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