PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

91964Gasket,oil Cooler

Irl Thermal Systems Ltd · NSN 5330-00-121-9646 · FSC 5330 · No Item Name Available
Verified by PartsTable
NSN 5330-00-121-9646 — this item is cataloged by the U.S. Government under National Stock Number 5330-00-121-9646. Primary manufacturer part number: 91964.
Features
  • Gasket,oil Cooler — FSC 5330
  • 2 verified cross-references
  • Primary manufacturer: Irl Thermal Systems Ltd
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The Gasket,oil Cooler, cataloged under National Stock Number 5330-00-121-9646, is classified within Federal Supply Class 5330 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Irl Thermal Systems Ltd. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameGasket,oil Cooler
FSC / FSG5330 — No Item Name Available (FSG 53)
ManufacturersRolls-Royce Airlines (CAGE K0680); Irl Thermal Systems Ltd (CAGE U1841)
Technical Specifications
ParameterValue
NSN5330-00-121-9646
Primary Part Number91964
Item NameGasket,oil Cooler
FSC / FSG5330 / 53 — No Item Name Available
ManufacturerIrl Thermal Systems Ltd
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5950-00-240-2554905468-1 INTERCHANGEABLE
Transformer,power
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
2520-00-377-4507CX111C002 INTERCHANGEABLE
Clutch Assembly,friction
Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
5961-01-114-0566 INTERCHANGEABLE
Transistor
2815-01-305-9877 INTERCHANGEABLE
Spindle,locking
Cross-Reference Index
Part NumberManufacturer
EU49903 Rolls-Royce Airlines (GBR)
91964 PRIMARY Irl Thermal Systems Ltd (GBR)
Related Parts
5950-00-240-2554INTERCHANGEABLE
TRANSFORMER,POWER
905468-1
2520-00-377-4507INTERCHANGEABLE
CLUTCH ASSEMBLY,FRICTION
CX111C002
5961-01-114-0566INTERCHANGEABLE
TRANSISTOR
2815-01-305-9877INTERCHANGEABLE
SPINDLE,LOCKING

Frequently Asked Questions

What is NSN 5330-00-121-9646?

NSN 5330-00-121-9646 is a Gasket,oil Cooler, manufactured by Irl Thermal Systems Ltd, classified under FSC 5330 (No Item Name Available). Status: active.

What are the part numbers for NSN 5330-00-121-9646?

NSN 5330-00-121-9646 has 2 cross-referenced part numbers: EU49903 (Rolls-Royce Airlines), 91964 (Irl Thermal Systems Ltd).

What NSN replaces 5330-00-121-9646?

There are 4 known substitutes for 5330-00-121-9646: 5950-00-240-2554, 2520-00-377-4507, 5961-01-114-0566 and 1 more. Verify interchangeability with system specifications before substitution.

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