The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-337-4778, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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
Seat,helical Compression Spring
FSC / FSG
5340 — Hardware, Commercial (FSG 53)
Technical Specifications
Parameter
Value
NSN
5340-00-337-4778
Item Name
Seat,helical Compression Spring
FSC / FSG
5340 / 53 — Hardware, Commercial
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
Possible hazard — SDS may be required (DLA HMIC P)
⇄Related Items3
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5365-00-433-532825138POSSIBLE MATCH
BUSHING,NONMETALLIC
Possible match (shared part number)Vse Aviation, Inc.
2530-01-266-121866044POSSIBLE MATCH
PARTS KIT,HYDRAULIC BRAKE WHEEL
Possible match (shared part number)Mark Industries
2920-01-490-1992M011102559SPOSSIBLE MATCH
HOUSING,ENGINE DRIVE,ELECTRICAL
Possible match (shared part number)Prestolite Electric Inc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
25138
3/2Design control — primary reference
U.S. Government activity
Related Parts
5365-00-433-5328POSSIBLE MATCH
BUSHING,NONMETALLIC
25138
2530-01-266-1218POSSIBLE MATCH
PARTS KIT,HYDRAULIC BRAKE WHEEL
66044
2920-01-490-1992POSSIBLE MATCH
HOUSING,ENGINE DRIVE,ELECTRICAL
M011102559S
Frequently Asked Questions
What is NSN 5340-00-337-4778?
NSN 5340-00-337-4778 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
What NSN replaces 5340-00-337-4778?
3 possible matches (shared part number, not a government interchangeability claim): 5365-00-433-5328, 2530-01-266-1218, 2920-01-490-1992. Verify interchangeability with system specifications before substitution.
Is NSN 5340-00-337-4778 hazardous material?
Possible hazard — SDS may be required (DLA HMIC P). 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.