PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21099-1Insulator,washer

Raytheon Company Dba Raytheon · NSN 5970-00-296-5084 · FSC 5970 · No Item Name Available
Verified by PartsTable
NSN 5970-00-296-5084 — this item is cataloged by the U.S. Government under National Stock Number 5970-00-296-5084. Primary manufacturer part number: 21099-1.
Features
  • Insulator,washer — FSC 5970
  • Inside Diameter: 0.275 INCHES NOMINAL IN
  • Outside Diameter: 0.568 INCHES NOMINAL IN
  • Style Designator: ROUND, FLAT
  • Material: MICA OVERALL
  • 3 verified cross-references
  • Primary manufacturer: Raytheon Company Dba Raytheon
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Mica Overall construction
General Description

The Insulator,washer, cataloged under National Stock Number 5970-00-296-5084, is classified within Federal Supply Class 5970 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Raytheon Company Dba Raytheon. Government technical data includes 4 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5970-00-296-5084
Primary Part Number21099-1
Item NameInsulator,washer
FSC / FSG5970 / 59 — No Item Name Available
ManufacturerRaytheon Company Dba Raytheon
StatusCANCELLED
Inside Diameter0.275 INCHES NOMINAL IN
Outside Diameter0.568 INCHES NOMINAL IN
Style DesignatorROUND, FLAT
MaterialMICA OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 2
2840-00-031-6349210991 INTERCHANGEABLE
Seal,air,aircraft Gas Turbine En
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
2835-00-654-681521099-1 INTERCHANGEABLE
Seal,fuel Can
Alamo Aircraft, Ltd.
Cross-Reference Index
Part NumberManufacturer
21099-1 PRIMARY Raytheon Company Dba Raytheon (USA)
304A104 PRIMARY General Dynamics Mission Systems, Inc. Dba Gdms (USA)
304A104 Motorola Inc. Dba Integrated Information Systems Group (USA)
Related Parts
2840-00-031-6349INTERCHANGEABLE
SEAL,AIR,AIRCRAFT GAS TURBINE EN
210991
2835-00-654-6815INTERCHANGEABLE
SEAL,FUEL CAN
21099-1

Frequently Asked Questions

What is NSN 5970-00-296-5084?

NSN 5970-00-296-5084 is a Insulator,washer, manufactured by Raytheon Company Dba Raytheon, classified under FSC 5970 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5970-00-296-5084?

NSN 5970-00-296-5084 has 3 cross-referenced part numbers: 21099-1 (Raytheon Company Dba Raytheon), 304A104 (General Dynamics Mission Systems, Inc. Dba Gdms), 304A104 (Motorola Inc. Dba Integrated Information Systems Group).

What NSN replaces 5970-00-296-5084?

There are 2 known substitutes for 5970-00-296-5084: 2840-00-031-6349, 2835-00-654-6815. Verify interchangeability with system specifications before substitution.

What are the specifications of 21099-1?

Key specifications for 21099-1: Inside Diameter: 0.275 INCHES NOMINAL IN; Outside Diameter: 0.568 INCHES NOMINAL IN; Style Designator: ROUND, FLAT; Material: MICA OVERALL. 5 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5970-00-296-5084 still in active supply?

NSN 5970-00-296-5084 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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