NSN 5340-01-491-4349 · NIIN 014914349 · Part number 124-7120998 PC 8-83
Naval Sea Systems Command · FSC 5340 — Hardware, Commercial · FSG 53 — Hardware and Abrasives · CAGE 53711
Government record, cited
NSN 5340-01-491-4349 — this item is cataloged by the U.S. Government under National Stock Number 5340-01-491-4349. Manufacturer of record part number: 124-7120998 PC 8-83.
Also searched as5340-01-491-4349 ·
5340014914349 ·
NIIN 014914349 ·
01-491-4349 ·
FSC 5340 Hardware, Commercial · CAGE 53711 · 124-7120998 PC 8-83 · 7120998
Nearby stock numbers← 5340-01-491-4336 Seat, Helical Compression Spring
·
5340-01-491-4354 Seat, Helical Compression Spring →
Features
Seat,helical Compression Spring — FSC 5340
First Step Diameter: 10.4380 INCHES NOMINAL IN
End Diameter: 7.8120 INCHES NOMINAL IN
Second End Diameter: 7.8120 INCHES NOMINAL IN
Distance From End to First Step: 1.5000 INCHES NOMINAL IN
Design Type: SPLIT
Style Designator: SEAT
Counterbore Length: 1.5000 INCHES NOMINAL IN
Identification
NSN: 5340-01-491-4349
NIIN: 014914349
FSC: 5340 — Hardware, Commercial
FSG: 53 — Hardware and Abrasives
Primary part number: 124-7120998 PC 8-83
Manufacturer: Naval Sea Systems Command
General Description
The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-491-4349, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
Technical Specifications
Parameter
Value
NSN
5340-01-491-4349
Primary Part Number
124-7120998 PC 8-83
Item Name
Seat,helical Compression Spring
FSC / FSG
5340 / 53 — Hardware, Commercial
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
First Step Diameter
10.4380 INCHES NOMINAL IN
End Diameter
7.8120 INCHES NOMINAL IN
Second End Diameter
7.8120 INCHES NOMINAL IN
Distance From End to First Step
1.5000 INCHES NOMINAL IN
Design Type
SPLIT
Style Designator
SEAT
Counterbore Length
1.5000 INCHES NOMINAL IN
Counterbore Diameter
6.0000 INCHES NOMINAL IN
First Step Length
0.6250 INCHES NOMINAL IN
Bore Diameter
6.0000 INCHES NOMINAL 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
Unit of Issue
EA
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5340-01-491-4354124-7120998 PC 8-82POSSIBLE MATCH
SEAT,HELICAL COMPRESSION SPRING
Possible match (shared part number)Naval Sea Systems Command
3040-01-491-7892124-7120998 PC 25POSSIBLE MATCH
CONNECTING LINK,RIGID
Possible match (shared part number)Naval Sea Systems Command
5340-01-492-0435124-7120998 PC 9-74POSSIBLE MATCH
SEAT,HELICAL COMPRESSION SPRING
Possible match (shared part number)Naval Sea Systems Command
5340-01-492-0438124-7120998 PC 9-76POSSIBLE MATCH
SEAT,HELICAL COMPRESSION SPRING
Possible match (shared part number)Naval Sea Systems Command
5365-01-492-0466124-7120998 PC 8-77POSSIBLE MATCH
SPACER,SLEEVE
Possible match (shared part number)Naval Sea Systems Command
5365-01-492-0469124-7120998 PC 8-74POSSIBLE MATCH
SPACER,SLEEVE
Possible match (shared part number)Naval Sea Systems Command
5365-01-492-0475124-7120998 PC 8-75POSSIBLE MATCH
SPACER,SLEEVE
Possible match (shared part number)Naval Sea Systems Command
NSN 5340-01-491-4349 is a Seat,helical Compression Spring, manufactured by Naval Sea Systems Command, classified under FSC 5340, Hardware, Commercial. Status: active.
What part numbers are listed for NSN 5340-01-491-4349?
NSN 5340-01-491-4349 has 1 manufacturer part number on file: 124-7120998 PC 8-83 (Naval Sea Systems Command).
What NSN replaces 5340-01-491-4349?
7 possible matches (shared part number, not a government interchangeability claim): 5340-01-491-4354, 3040-01-491-7892, 5340-01-492-0435. Verify interchangeability with system specifications before substitution.
What are the specifications of 124-7120998 PC 8-83?
Key specifications for 124-7120998 PC 8-83: Overall Height: 3.6250 INCHES NOMINAL IN; First Step Diameter: 10.4380 INCHES NOMINAL IN; End Diameter: 7.8120 INCHES NOMINAL IN; Second End Diameter: 7.8120 INCHES NOMINAL IN. 11 specifications are documented in the U.S. Government catalog.
Is NSN 5340-01-491-4349 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.