PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2121-58Washer,flat

U S Dept of Transportation Federal Aviation Administration · NSN 5310-01-439-3698 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-439-3698 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-439-3698. Primary manufacturer part number: 2121-58.
Features
  • Washer,flat — FSC 5310
  • 2 verified cross-references
  • Primary manufacturer: U S Dept of Transportation Federal Aviation Administration
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Washer,flat, cataloged under National Stock Number 5310-01-439-3698, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is U S Dept of Transportation Federal Aviation Administration. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-439-3698
Primary Part Number2121-58
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerU S Dept of Transportation Federal Aviation Administration
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
3020-00-517-2933212110 INTERCHANGEABLE
Gear,helical
Rexnord Industries Llc
Cross-Reference Index
Part NumberManufacturer
2121-58 PRIMARY U S Dept of Transportation Federal Aviation Administration (USA)
2121-58 Cpi Essco Inc (USA)
Related Parts
3020-00-517-2933INTERCHANGEABLE
GEAR,HELICAL
212110

Frequently Asked Questions

What is NSN 5310-01-439-3698?

NSN 5310-01-439-3698 is a Washer,flat, manufactured by U S Dept of Transportation Federal Aviation Administration, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-439-3698?

NSN 5310-01-439-3698 has 2 cross-referenced part numbers: 2121-58 (U S Dept of Transportation Federal Aviation Administration), 2121-58 (Cpi Essco Inc).

What NSN replaces 5310-01-439-3698?

There is 1 known substitute for 5310-01-439-3698: 3020-00-517-2933. Verify interchangeability with system specifications before substitution.

What are the specifications of 2121-58?

Key specifications for 2121-58: End Item Identification: ARSR4. 1 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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