The Washer,flat, cataloged under National Stock Number 5310-01-481-1203, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5310-01-481-1203
Item Name
Washer,flat
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Overall Diameter
2.250 INCHES NOMINAL IN
Cross-Sectional Shape Style
RECTANGULAR
Peripheral Shape Style
ROUND
Material
STEEL OVERALL
Center Hole Shape Style
ROUND
Hole Diameter
1.375 INCHES NOMINAL IN
Thickness
0.188 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-01-481-1217122-2404507 PC 24POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)Naval Ship Systems Command
5310-01-481-1585122-2404507 PC 33POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)Naval Ship Systems Command
5310-01-481-1587122-2404507 PC 32POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)Naval Ship Systems Command
3120-01-481-4969122-2404507 PC 31POSSIBLE MATCH
BUSHING,SLEEVE
Possible match (shared part number)Naval Ship Systems Command
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
122-2404507 PC 10
3/2Design control — primary reference
U.S. Government activity
2404507
D/9Drawing number reference only
U.S. Government activity
Related Parts
5310-01-481-1217POSSIBLE MATCH
WASHER,FLAT
122-2404507 PC 24
5310-01-481-1585POSSIBLE MATCH
WASHER,FLAT
122-2404507 PC 33
5310-01-481-1587POSSIBLE MATCH
WASHER,FLAT
122-2404507 PC 32
3120-01-481-4969POSSIBLE MATCH
BUSHING,SLEEVE
122-2404507 PC 31
Frequently Asked Questions
What is NSN 5310-01-481-1203?
NSN 5310-01-481-1203 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
What NSN replaces 5310-01-481-1203?
4 possible matches (shared part number, not a government interchangeability claim): 5310-01-481-1217, 5310-01-481-1585, 5310-01-481-1587. Verify interchangeability with system specifications before substitution.
What are the specifications of 5310-01-481-1203?
Key specifications for 5310-01-481-1203: Overall Diameter: 2.250 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; End Item Identification: DOOR ASSY WHT. 7 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-481-1203 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.