PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1240599O-Ring

Northrop Grumman Systems Corporation · NSN 5331-00-809-8212 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-00-809-8212 — this item is cataloged by the U.S. Government under National Stock Number 5331-00-809-8212. Primary manufacturer part number: 1240599.
Features
  • O-Ring — FSC 5331
  • Material: RUBBER CHLOROPRENE CLASS CR
  • Center Hole Diameter: 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN
  • Cross-Sectional Height: 0.084 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN
  • 3 verified cross-references
  • Primary manufacturer: Northrop Grumman Systems Corporation
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Rubber Chloroprene Class Cr construction
General Description

The O-Ring, cataloged under National Stock Number 5331-00-809-8212, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5331-00-809-8212
Primary Part Number1240599
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerNorthrop Grumman Systems Corporation
StatusACTIVE
MaterialRUBBER CHLOROPRENE CLASS CR
Center Hole Diameter1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN
Cross-Sectional Height0.084 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5950-00-137-8070111-046-0002 INTERCHANGEABLE
Coil,radio Frequency
Northrop Grumman Systems Corporation
5330-00-250-1187583-5 INTERCHANGEABLE
Packing,preformed
Ontic Engineering & Manufacturing, Inc Dba Ontic Us
6140-00-328-388812-35 INTERCHANGEABLE
Battery,storage
Exide Corp
1680-00-489-28365835-5 INTERCHANGEABLE
Lever,remote Control
Goodrich Aerospace Canada Ltd
5950-00-539-7797667071 INTERCHANGEABLE
Transformer,audio Frequency
Stromberg-Carlson Corp a Plessey Telecommunications Co
5950-00-645-29647410334P001 INTERCHANGEABLE
Transformer,radio Frequency
General Electric Company Dba Ge Structured Services Div General Electric Structured Services, Lp
5998-01-205-0903583-5 INTERCHANGEABLE
Printed Circuit Board
Navy, United States Department of the Dba Space & Naval Warfare Systems Center, Atlantic
4920-01-231-85105835 INTERCHANGEABLE
Card Puller,iea
Protolab
6105-01-363-4709E9155 INTERCHANGEABLE
Motor,alternating Current
General Electric Co Motor Business Group
6515-01-387-41095835 INTERCHANGEABLE
Splint,wrist and Thumb
Alimed, Inc. Dba Alimed Inc
Cross-Reference Index
Part NumberManufacturer
1240599 Lockheed Martin Corporation Div Rms - Mitchel Field (USA)
5835 Strohmeyer, Julie a. Dba Julie a. Strohmeyer (USA)
1240599 PRIMARY Northrop Grumman Systems Corporation (USA)
Related Parts
5950-00-137-8070INTERCHANGEABLE
COIL,RADIO FREQUENCY
111-046-0002
5330-00-250-1187INTERCHANGEABLE
PACKING,PREFORMED
583-5
6140-00-328-3888INTERCHANGEABLE
BATTERY,STORAGE
12-35
1680-00-489-2836INTERCHANGEABLE
LEVER,REMOTE CONTROL
5835-5
5950-00-539-7797INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
667071
5950-00-645-2964INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
7410334P001
5998-01-205-0903INTERCHANGEABLE
PRINTED CIRCUIT BOARD
583-5
4920-01-231-8510INTERCHANGEABLE
CARD PULLER,IEA
5835
6105-01-363-4709INTERCHANGEABLE
MOTOR,ALTERNATING CURRENT
E9155
6515-01-387-4109INTERCHANGEABLE
SPLINT,WRIST AND THUMB
5835
4730-01-464-2748INTERCHANGEABLE
STRAINER,SEDIMENT
5835
6130-01-474-6544INTERCHANGEABLE
POWER SUPPLY
5835

Frequently Asked Questions

What is NSN 5331-00-809-8212?

NSN 5331-00-809-8212 is a O-Ring, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-00-809-8212?

NSN 5331-00-809-8212 has 3 cross-referenced part numbers: 1240599 (Lockheed Martin Corporation Div Rms - Mitchel Field), 5835 (Strohmeyer, Julie a. Dba Julie a. Strohmeyer), 1240599 (Northrop Grumman Systems Corporation).

What NSN replaces 5331-00-809-8212?

There are 12 known substitutes for 5331-00-809-8212: 5950-00-137-8070, 5330-00-250-1187, 6140-00-328-3888 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1240599?

Key specifications for 1240599: Material: RUBBER CHLOROPRENE CLASS CR; Center Hole Diameter: 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN; Cross-Sectional Height: 0.084 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN. 3 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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