PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20521O-Ring

Electro Impulse Laboratory Inc Dba Electro Impulse Inc · NSN 5331-01-171-6310 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-01-171-6310 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-171-6310. Primary manufacturer part number: 20521.
Features
  • O-Ring — FSC 5331
  • 1 verified cross-reference
  • Primary manufacturer: Electro Impulse Laboratory Inc Dba Electro Impulse Inc
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The O-Ring, cataloged under National Stock Number 5331-01-171-6310, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Electro Impulse Laboratory Inc Dba Electro Impulse Inc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameO-Ring
FSC / FSG5331 — O-Ring (FSG 53)
ManufacturersElectro Impulse Laboratory Inc Dba Electro Impulse Inc (CAGE 91161)
Technical Specifications
ParameterValue
NSN5331-01-171-6310
Primary Part Number20521
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerElectro Impulse Laboratory Inc Dba Electro Impulse Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
4730-00-277-53095710S1-8 INTERCHANGEABLE
Plug,pipe
The Walworth Company
5340-00-559-8763 INTERCHANGEABLE
Clip,spring Tension
5945-00-883-683713217E4066-1 INTERCHANGEABLE
Relay,electromagnetic
Cecom Lr Center
5340-01-124-458520521 INTERCHANGEABLE
Seat,helical Compression Spring
Eaton Corporation Dba Airframe Div Fuel & Motion Control Systems
4710-01-176-089120714 INTERCHANGEABLE
Tube,metallic
Alcoa/reynolds Metals Company
5310-01-391-2749 INTERCHANGEABLE
Nut,self-Locking,hexagon
Cross-Reference Index
Part NumberManufacturer
20521 PRIMARY Electro Impulse Laboratory Inc Dba Electro Impulse Inc (USA)
Related Parts
4730-00-277-5309INTERCHANGEABLE
PLUG,PIPE
5710S1-8
5340-00-559-8763INTERCHANGEABLE
CLIP,SPRING TENSION
5945-00-883-6837INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
13217E4066-1
5340-01-124-4585INTERCHANGEABLE
SEAT,HELICAL COMPRESSION SPRING
20521
4710-01-176-0891INTERCHANGEABLE
TUBE,METALLIC
20714
5310-01-391-2749INTERCHANGEABLE
NUT,SELF-LOCKING,HEXAGON

Frequently Asked Questions

What is NSN 5331-01-171-6310?

NSN 5331-01-171-6310 is a O-Ring, manufactured by Electro Impulse Laboratory Inc Dba Electro Impulse Inc, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-01-171-6310?

NSN 5331-01-171-6310 has 1 cross-referenced part number: 20521 (Electro Impulse Laboratory Inc Dba Electro Impulse Inc).

What NSN replaces 5331-01-171-6310?

There are 6 known substitutes for 5331-01-171-6310: 4730-00-277-5309, 5340-00-559-8763, 5945-00-883-6837 and 3 more. Verify interchangeability with system specifications before substitution.

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