Material: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OVERALL
Center Hole Shape Style: ROUND
Hole Diameter: 2.265 INCHES NOMINAL IN
Identification
NSN: 5310-00-720-8603
NIIN: 007208603
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
General Description
The Washer,flat, cataloged under National Stock Number 5310-00-720-8603, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government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
5310-00-720-8603
Item Name
Washer,flat
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Overall Diameter
3.000 INCHES NOMINAL IN
Cross-Sectional Shape Style
RECTANGULAR
Surface Treatment
PASSIVATE OVERALL
Peripheral Shape Style
ROUND
Material
STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OVERALL
Center Hole Shape Style
ROUND
Hole Diameter
2.265 INCHES NOMINAL IN
Thickness
0.090 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 Items9
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-01-506-56316390826-10POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)Naval Sea Systems Command
5310-01-506-72276390826-13POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
5310-01-533-8065NAS1149F1232PPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-539-9991NAS1149F0763BPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-542-3107NAS1149T0663LPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-551-3763NAS1149D3616JPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-667-1839NAS1149T0832LPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-670-3424POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)
5310-01-695-5500NAS1149V0416HPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
NAS1149
3/1Design control — primary reference
U.S. Government activity
NAS1149C3690R
3/2Design control — primary reference
U.S. Government activity
AN960C3616
5/9Secondary reference
U.S. Government activity
Related Parts
5310-01-506-5631POSSIBLE MATCH
WASHER,FLAT
6390826-10
5310-01-506-7227POSSIBLE MATCH
WASHER,FLAT
6390826-13
5310-01-533-8065POSSIBLE MATCH
WASHER,FLAT
NAS1149F1232P
5310-01-539-9991POSSIBLE MATCH
WASHER,FLAT
NAS1149F0763B
5310-01-542-3107POSSIBLE MATCH
WASHER,FLAT
NAS1149T0663L
5310-01-551-3763POSSIBLE MATCH
WASHER,FLAT
NAS1149D3616J
5310-01-667-1839POSSIBLE MATCH
WASHER,FLAT
NAS1149T0832L
5310-01-670-3424POSSIBLE MATCH
WASHER,FLAT
5310-01-695-5500POSSIBLE MATCH
WASHER,FLAT
NAS1149V0416H
Frequently Asked Questions
What is NSN 5310-00-720-8603?
NSN 5310-00-720-8603 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
What NSN replaces 5310-00-720-8603?
9 possible matches (shared part number, not a government interchangeability claim): 5310-01-506-5631, 5310-01-506-7227, 5310-01-533-8065. Verify interchangeability with system specifications before substitution.
What are the specifications of 5310-00-720-8603?
Key specifications for 5310-00-720-8603: Overall Diameter: 3.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: PASSIVATE OVERALL; Peripheral Shape Style: ROUND. 8 specifications are documented in the U.S. Government catalog.
Is NSN 5310-00-720-8603 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.