Surface Treatment Document and Classification: QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Overall Diameter: 2.381 INCHES MINIMUM AND 2.391 INCHES MAXIMUM IN
Hardness Rating: 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
Material Document and Classification: MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
Cross-Sectional Shape Style: RECTANGULAR
Surface Treatment: CADMIUM OVERALL
Peripheral Shape Style: ROUND
Identification
NSN: 5310-01-466-6146
NIIN: 014666146
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
General Description
The Washer,flat, cataloged under National Stock Number 5310-01-466-6146, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
5310-01-466-6146
Item Name
Washer,flat
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Surface Treatment Document and Classification
QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Overall Diameter
2.381 INCHES MINIMUM AND 2.391 INCHES MAXIMUM IN
Hardness Rating
39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM
Material Document and Classification
MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
Cross-Sectional Shape Style
RECTANGULAR
Surface Treatment
CADMIUM OVERALL
Peripheral Shape Style
ROUND
Material
STEEL OVERALL
Center Hole Shape Style
ROUND
Hole Diameter
1.252 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN
Thickness
0.062 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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-01-591-1396MS21299-12KPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-666-2194MS21299-10KPOSSIBLE MATCH
WASHER,SPECIAL
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-666-2199MS21299C20KPOSSIBLE MATCH
WASHER,SPECIAL
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-713-4379MS21299-9KPOSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5310-01-713-4385MS21299-14KPOSSIBLE 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
MS21299
5/9Secondary reference
U.S. Government activity
MS21299-20
5/9Secondary reference
U.S. Government activity
NASM21299
5/1Secondary reference
U.S. Government activity
MS21299-20
3/2Design control — primary reference
U.S. Government activity
Related Parts
5310-01-591-1396POSSIBLE MATCH
WASHER,FLAT
MS21299-12K
5310-01-666-2194POSSIBLE MATCH
WASHER,SPECIAL
MS21299-10K
5310-01-666-2199POSSIBLE MATCH
WASHER,SPECIAL
MS21299C20K
5310-01-713-4379POSSIBLE MATCH
WASHER,FLAT
MS21299-9K
5310-01-713-4385POSSIBLE MATCH
WASHER,FLAT
MS21299-14K
Frequently Asked Questions
What is NSN 5310-01-466-6146?
NSN 5310-01-466-6146 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
What NSN replaces 5310-01-466-6146?
5 possible matches (shared part number, not a government interchangeability claim): 5310-01-591-1396, 5310-01-666-2194, 5310-01-666-2199. Verify interchangeability with system specifications before substitution.
What are the specifications of 5310-01-466-6146?
Key specifications for 5310-01-466-6146: Surface Treatment Document and Classification: QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 2.381 INCHES MINIMUM AND 2.391 INCHES MAXIMUM IN; Hardness Rating: 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM; Material Document and Classification: MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 2ND MATERIAL RESPONSE OVERALL. 11 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-466-6146 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.