NSN 5340-00-345-3393 — this item is cataloged by the U.S. Government under National Stock Number 5340-00-345-3393. Manufacturer of record part number: 20-278.
Also searched as5340-00-345-3393 ·
5340003453393 ·
NIIN 003453393 ·
00-345-3393 ·
FSC 5340 Hardware, Commercial · CAGE 71995 · 20-278
Ridge Height: 0.0840 INCHES MINIMUM AND 0.1040 INCHES MAXIMUM IN
First Step Diameter: 1.7090 INCHES MINIMUM AND 1.7290 INCHES MAXIMUM IN
Design Type: SOLID
Distance From Center to Beginning of Ridge: 0.7560 INCHES MINIMUM AND 0.7760 INCHES MAXIMUM IN
Bore Taper in Deg: 7.0
Bore Diameter: 0.5910 INCHES MINIMUM AND 0.5950 INCHES MAXIMUM IN
Material: STEEL
Identification
NSN: 5340-00-345-3393
NIIN: 003453393
FSC: 5340 — Hardware, Commercial
FSG: 53 — Hardware and Abrasives
Primary part number: 20-278
Manufacturer: Dresser Industries Inc Waukesha Engine Div
General Description
The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-345-3393, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Dresser Industries Inc Waukesha Engine Div. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 7 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
5340-00-345-3393
Primary Part Number
20-278
Item Name
Seat,helical Compression Spring
FSC / FSG
5340 / 53 — Hardware, Commercial
Manufacturer
Dresser Industries Inc Waukesha Engine Div
Status
ACTIVE
Ridge Height
0.0840 INCHES MINIMUM AND 0.1040 INCHES MAXIMUM IN
First Step Diameter
1.7090 INCHES MINIMUM AND 1.7290 INCHES MAXIMUM IN
Design Type
SOLID
Distance From Center to Beginning of Ridge
0.7560 INCHES MINIMUM AND 0.7760 INCHES MAXIMUM IN
Bore Taper in Deg
7.0
Bore Diameter
0.5910 INCHES MINIMUM AND 0.5950 INCHES MAXIMUM IN
Material
STEEL
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
Possible hazard — SDS may be required (DLA HMIC P)
Criticality Code
X
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5365-00-597-7732POSSIBLE MATCH
SHIM
Possible match (shared part number)
5950-00-648-6873B-7485515POSSIBLE MATCH
TRANSFORMER,POWER
Possible match (shared part number)Lockheed Martin Corporation Div Rms
5915-01-084-656792157POSSIBLE MATCH
FILTER,BAND PASS
Possible match (shared part number)Drs Signal Solutions, Inc.
4820-01-127-511820278POSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-127-7970A12721.001.132POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
5962-01-169-4813POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
Possible match (shared part number)
6150-01-696-507020278POSSIBLE MATCH
POWER STRIP,ELECTRICAL OUTLET
Possible match (shared part number)Ortronics, Inc. Dba Ortronics Div Legrand Data Communications
NSN 5340-00-345-3393 is a Seat,helical Compression Spring, manufactured by Dresser Industries Inc Waukesha Engine Div, classified under FSC 5340, Hardware, Commercial. Status: active.
What part numbers are listed for NSN 5340-00-345-3393?
NSN 5340-00-345-3393 has 1 manufacturer part number on file: 20-278 (Dresser Industries Inc Waukesha Engine Div).
What NSN replaces 5340-00-345-3393?
7 possible matches (shared part number, not a government interchangeability claim): 5365-00-597-7732, 5950-00-648-6873, 5915-01-084-6567. Verify interchangeability with system specifications before substitution.
What are the specifications of 20-278?
Key specifications for 20-278: Ridge Height: 0.0840 INCHES MINIMUM AND 0.1040 INCHES MAXIMUM IN; Overall Height: 0.4590 INCHES MINIMUM AND 0.4790 INCHES MAXIMUM IN; First Step Diameter: 1.7090 INCHES MINIMUM AND 1.7290 INCHES MAXIMUM IN; Design Type: SOLID. 7 specifications are documented in the U.S. Government catalog.
Is NSN 5340-00-345-3393 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.