PartsTable TECHNICAL DATA SHEET
NSN 2990-01-678-4591Government record, cited

Vent, Exhaust2990-01-678-4591

NSN 2990-01-678-4591 · NIIN 016784591 · Part number AL4003949
General Dynamics Ordnance and Tactical Systems, Inc. · FSC 2990 — Miscellaneous Engine Accessories, Nonaircraft · FSG 29 — Engine Accessories · CAGE 0F875
Government record, cited
NSN 2990-01-678-4591 — this item is cataloged by the U.S. Government under National Stock Number 2990-01-678-4591. Manufacturer of record part number: AL4003949.
Also searched as  2990-01-678-4591 · 2990016784591 · NIIN 016784591 · 01-678-4591 · FSC 2990 Miscellaneous Engine Accessories, Nonaircraft · CAGE 0F875 · AL4003949 · 9993K32
Nearby stock numbers  ·
Features
  • Vent,exhaust — FSC 2990
  • 3 manufacturer part numbers on file
  • Manufacturer of record: General Dynamics Ordnance and Tactical Systems, Inc.
Identification
  • NSN: 2990-01-678-4591
  • NIIN: 016784591
  • FSC: 2990 — Miscellaneous Engine Accessories, Nonaircraft
  • FSG: 29 — Engine Accessories
  • Primary part number: AL4003949
  • Manufacturer: General Dynamics Ordnance and Tactical Systems, Inc.
General Description

The Vent,exhaust, cataloged under National Stock Number 2990-01-678-4591, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is General Dynamics Ordnance and Tactical Systems, Inc.. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2990-01-678-4591
Primary Part NumberAL4003949
Item NameVent,exhaust
FSC / FSG2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft
ManufacturerGeneral Dynamics Ordnance and Tactical Systems, Inc.
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
DEMIL CodeDEMIL A — No Demilitarization Required
HazardNo hazard code in the DLA record (HMIC N)
Criticality CodeX
Cross-Reference Index
Part NumberManufacturer
9993K32 Mcmaster-Carr Supply Co (USA)
AL4003949 PRIMARY General Dynamics Ordnance and Tactical Systems, Inc. (USA)
AL4003949 Flyer Defense, Llc (USA)
No interchangeability data on file.
Other items in FSC 2990 — Miscellaneous Engine Accessories, Nonaircraft
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
2990-00-096-8607
CONTROL ASSEMBLY,PUSH-PULL
2990-00-390-3445
CRANK,HAND,VEHICULAR
2990-00-459-7255
MUFFLER,EXHAUST
2990-00-459-7255
MUFFLER,EXHAUST
2990-00-536-2962
BLOCK,ADJUSTING SCREW
2990-00-903-8226
MUFFLER,EXHAUST
2990-01-151-5443
CONNECTOR,EXHAUST PIPE
2990-01-151-5443
CONNECTOR,EXHAUST PIPE

Frequently Asked Questions

What is NSN 2990-01-678-4591?

NSN 2990-01-678-4591 is a Vent,exhaust, manufactured by General Dynamics Ordnance and Tactical Systems, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.

What part numbers are listed for NSN 2990-01-678-4591?

NSN 2990-01-678-4591 has 3 manufacturer part numbers on file: 9993K32 (Mcmaster-Carr Supply Co), AL4003949 (General Dynamics Ordnance and Tactical Systems, Inc.), AL4003949 (Flyer Defense, Llc).

What are the specifications of AL4003949?

Key specifications for AL4003949: End Item Identification: 2355016275147. 0 specifications are documented in the U.S. Government catalog.

Is NSN 2990-01-678-4591 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.
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