PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MILR5521Gasket

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5330-00-186-1341 · FSC 5330 · No Item Name Available
Verified by PartsTable
NSN 5330-00-186-1341 — this item is cataloged by the U.S. Government under National Stock Number 5330-00-186-1341. Primary manufacturer part number: MILR5521.
Features
  • Gasket — FSC 5330
  • Material: LEATHER OVERALL
  • Aperture Diameter: 3.754 INCHES NOMINAL IN
  • Outside Diameter: 4.000 INCHES NOMINAL IN
  • Cross-Sectional Shape Style: SOLID SINGLE OR COMPOSITION
  • Cross-Sectional Thickness: 0.062 INCHES NOMINAL IN
  • Style Designator: CIRCULAR
  • 3 verified cross-references
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Leather Overall construction
General Description

The Gasket, cataloged under National Stock Number 5330-00-186-1341, is classified within Federal Supply Class 5330 (No Item Name Available) 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 6 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: Cancelled.

Technical Specifications
ParameterValue
NSN5330-00-186-1341
Primary Part NumberMILR5521
Item NameGasket
FSC / FSG5330 / 53 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusCANCELLED
MaterialLEATHER OVERALL
Aperture Diameter3.754 INCHES NOMINAL IN
Outside Diameter4.000 INCHES NOMINAL IN
Cross-Sectional Shape StyleSOLID SINGLE OR COMPOSITION
Cross-Sectional Thickness0.062 INCHES NOMINAL IN
Style DesignatorCIRCULAR
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5310-00-058-2813 INTERCHANGEABLE
Washer,flat
5330-00-058-2814 INTERCHANGEABLE
Gasket
5330-00-058-2830 INTERCHANGEABLE
Gasket
5365-00-058-2838 INTERCHANGEABLE
Spacer,ring
5330-00-058-2845 INTERCHANGEABLE
Gasket
5330-00-058-2868 INTERCHANGEABLE
Gasket
5330-00-071-6863 INTERCHANGEABLE
Retainer,packing
5330-00-171-6749 INTERCHANGEABLE
Retainer,packing
5330-00-186-1309 INTERCHANGEABLE
Retainer,packing
5330-00-186-1338 INTERCHANGEABLE
Retainer,packing
Cross-Reference Index
Part NumberManufacturer
MILR5521 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
AN6244PC18 Joint Army-Navy Specifications Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
AN6244-18 Aeronautical Standards Group Dept of Navy and Air Force (USA)
Related Parts
5310-00-058-2813INTERCHANGEABLE
WASHER,FLAT
5330-00-058-2814INTERCHANGEABLE
GASKET
5330-00-058-2830INTERCHANGEABLE
GASKET
5365-00-058-2838INTERCHANGEABLE
SPACER,RING
5330-00-058-2845INTERCHANGEABLE
GASKET
5330-00-058-2868INTERCHANGEABLE
GASKET
5330-00-071-6863INTERCHANGEABLE
RETAINER,PACKING
5330-00-171-6749INTERCHANGEABLE
RETAINER,PACKING
5330-00-186-1309INTERCHANGEABLE
RETAINER,PACKING
5330-00-186-1338INTERCHANGEABLE
RETAINER,PACKING
5330-00-186-4943INTERCHANGEABLE
RETAINER,PACKING
5330-00-531-4601INTERCHANGEABLE
RETAINER,PACKING

Frequently Asked Questions

What is NSN 5330-00-186-1341?

NSN 5330-00-186-1341 is a Gasket, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5330 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5330-00-186-1341?

NSN 5330-00-186-1341 has 3 cross-referenced part numbers: MILR5521 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), AN6244PC18 (Joint Army-Navy Specifications Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), AN6244-18 (Aeronautical Standards Group Dept of Navy and Air Force).

What NSN replaces 5330-00-186-1341?

There are 12 known substitutes for 5330-00-186-1341: 5310-00-058-2813, 5330-00-058-2814, 5330-00-058-2830 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MILR5521?

Key specifications for MILR5521: Material: LEATHER OVERALL; Aperture Diameter: 3.754 INCHES NOMINAL IN; Outside Diameter: 4.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: SOLID SINGLE OR COMPOSITION. 6 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5330-00-186-1341 still in active supply?

NSN 5330-00-186-1341 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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