FSC: 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
FSG: 16 — Aircraft Components and Accessories
General Description
The Fitting,oxygen Line, cataloged under National Stock Number 1660-00-758-1677, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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
Fitting,oxygen Line
FSC / FSG
1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment (FSG 16)
Technical Specifications
Parameter
Value
NSN
1660-00-758-1677
Item Name
Fitting,oxygen Line
FSC / FSG
1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL B — Remove Demilitarization Key Points
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items6
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-149-49633IN R1020-43AA-1FMPOSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Dover Resources, Inc. Div Norriseal
4820-01-149-507051310B171POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Norriseal Norris Values Div Dba Dover Co
4820-01-155-77511061353POSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Dover Resources, Inc. Div Norriseal
4820-01-160-35974R1020-43AA-1FMPOSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Dover Resources, Inc. Div Norriseal
4820-01-182-24895IN R1020-43AA-1FMPOSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Norriseal Norris Values Div Dba Dover Co
3040-01-467-820291-1420-1POSSIBLE MATCH
CONNECTING LINK,RIGID
Possible match (shared part number)Grimes Aerospace Company
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
911-420
3/2Design control — primary reference
U.S. Government activity
911-421
5/2Secondary reference
U.S. Government activity
Related Parts
4820-01-149-4963POSSIBLE MATCH
VALVE,BUTTERFLY
3IN R1020-43AA-1FM
4820-01-149-5070POSSIBLE MATCH
DISK,VALVE
51310B171
4820-01-155-7751POSSIBLE MATCH
VALVE,BUTTERFLY
1061353
4820-01-160-3597POSSIBLE MATCH
VALVE,BUTTERFLY
4R1020-43AA-1FM
4820-01-182-2489POSSIBLE MATCH
VALVE,BUTTERFLY
5IN R1020-43AA-1FM
3040-01-467-8202POSSIBLE MATCH
CONNECTING LINK,RIGID
91-1420-1
Frequently Asked Questions
What is NSN 1660-00-758-1677?
NSN 1660-00-758-1677 is a Fitting,oxygen Line, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
What NSN replaces 1660-00-758-1677?
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-149-4963, 4820-01-149-5070, 4820-01-155-7751. Verify interchangeability with system specifications before substitution.
Is NSN 1660-00-758-1677 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.
What is the DEMIL code for NSN 1660-00-758-1677?
NSN 1660-00-758-1677 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.