The Washer,lock, cataloged under National Stock Number 5310-01-278-9566, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Washer,lock
FSC / FSG
5310 — Nuts and Washers (FSG 53)
Technical Specifications
Parameter
Value
NSN
5310-01-278-9566
Item Name
Washer,lock
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items2
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5340-01-473-0444VF-027BPOSSIBLE MATCH
CAP-PLUG,PROTECTIVE,DUST AND MOI
Possible match (shared part number)Itw Food Equipment Group Llc Dba Gaylord Industries
1680-01-585-47341024-4POSSIBLE MATCH
DIMMER CONTROL UNIT
Possible match (shared part number)Vas Aero Services, Llc Dba Vas Aero Services, Llc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
10244
3/9Design control — primary reference
Bosch Automotive Service Solutions Inc.
Related Parts
5340-01-473-0444POSSIBLE MATCH
CAP-PLUG,PROTECTIVE,DUST AND MOI
VF-027B
1680-01-585-4734POSSIBLE MATCH
DIMMER CONTROL UNIT
1024-4
Frequently Asked Questions
What is NSN 5310-01-278-9566?
NSN 5310-01-278-9566 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
What NSN replaces 5310-01-278-9566?
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-473-0444, 1680-01-585-4734. Verify interchangeability with system specifications before substitution.
Is NSN 5310-01-278-9566 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.