PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-R-3533O-Ring

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5331-00-702-0218 · FSC 5331 · O-Ring
Verified by PartsTable
NSN 5331-00-702-0218 — this item is cataloged by the U.S. Government under National Stock Number 5331-00-702-0218. Primary manufacturer part number: MIL-R-3533.
Features
  • O-Ring — FSC 5331
  • Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN
  • Center Hole Diameter: 6.461 INCHES MINIMUM AND 6.507 INCHES MAXIMUM IN
  • Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
  • 7 verified cross-references
  • Primary manufacturer: Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Rubber Butadiene-Acrylonitrile Class Nbr construction
General Description

The O-Ring, cataloged under National Stock Number 5331-00-702-0218, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5331-00-702-0218
Primary Part NumberMIL-R-3533
Item NameO-Ring
FSC / FSG5331 / 53 — O-Ring
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Cross-Sectional Height0.135 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN
Center Hole Diameter6.461 INCHES MINIMUM AND 6.507 INCHES MAXIMUM IN
MaterialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5325-00-009-5783264681R1 INTERCHANGEABLE
Ring,retaining
Dressta North America Ltd
5331-00-297-5408740621 INTERCHANGEABLE
O-Ring
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5331-01-057-3127AS568-912 INTERCHANGEABLE
O-Ring
Sae International Dba Sae International
9390-01-353-90643237560 INTERCHANGEABLE
Nonmetallic Special Shaped Secti
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
9390-01-353-90663237561 INTERCHANGEABLE
Nonmetallic Special Shaped Secti
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5331-01-400-58592-260N525-60 INTERCHANGEABLE
O-Ring
Parker-Hannifin Corp Div O-Ring Division
5330-01-498-9671 INTERCHANGEABLE
Seal,nonmetallic Strip
5330-01-498-9696 INTERCHANGEABLE
Seal,nonmetallic Strip
Cross-Reference Index
Part NumberManufacturer
MIL-R-3533 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
264681R1 Navistar International Corporation Dba Navistar (USA)
264681R1 Navistar Intl Corp Melrose Park Engine Plant Location /melrose Park/ (USA)
264681R1 Komatsu American Intl Co (USA)
264681 R1 Zf Industrieantriebe Witten Gmbh (DEU)
AS568B-260 Society of Automotive Engineers Inc (USA)
AS568B-260 Sae International Dba Sae International (USA)
Related Parts
5325-00-009-5783INTERCHANGEABLE
RING,RETAINING
264681R1
5331-00-297-5408INTERCHANGEABLE
O-RING
740621
5331-01-057-3127INTERCHANGEABLE
O-RING
AS568-912
9390-01-353-9064INTERCHANGEABLE
NONMETALLIC SPECIAL SHAPED SECTI
3237560
9390-01-353-9066INTERCHANGEABLE
NONMETALLIC SPECIAL SHAPED SECTI
3237561
5331-01-400-5859INTERCHANGEABLE
O-RING
2-260N525-60
5330-01-498-9671INTERCHANGEABLE
SEAL,NONMETALLIC STRIP
5330-01-498-9696INTERCHANGEABLE
SEAL,NONMETALLIC STRIP

Frequently Asked Questions

What is NSN 5331-00-702-0218?

NSN 5331-00-702-0218 is a O-Ring, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5331 (O-Ring). Status: active.

What are the part numbers for NSN 5331-00-702-0218?

NSN 5331-00-702-0218 has 7 cross-referenced part numbers: MIL-R-3533 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 264681R1 (Navistar International Corporation Dba Navistar), 264681R1 (Navistar Intl Corp Melrose Park Engine Plant Location /melrose Park/), 264681R1 (Komatsu American Intl Co), 264681 R1 (Zf Industrieantriebe Witten Gmbh) and 2 more.

What NSN replaces 5331-00-702-0218?

There are 8 known substitutes for 5331-00-702-0218: 5325-00-009-5783, 5331-00-297-5408, 5331-01-057-3127 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-R-3533?

Key specifications for MIL-R-3533: Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.139 INCHES MAXIMUM IN; Center Hole Diameter: 6.461 INCHES MINIMUM AND 6.507 INCHES MAXIMUM IN; Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR. 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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