The Barrel,aircraft Clo, cataloged under National Stock Number 6645-00-166-6679, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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
Barrel,aircraft Clo
FSC / FSG
6645 — Time Measuring Instruments (FSG 66)
Technical Specifications
Parameter
Value
NSN
6645-00-166-6679
Item Name
Barrel,aircraft Clo
FSC / FSG
6645 / 66 — Time Measuring Instruments
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-00-177-102722021POSSIBLE MATCH
WASHER,FLAT
Possible match (shared part number)Avox Systems Inc Dba Avox Systems Inc
5330-01-411-586522021POSSIBLE MATCH
PACKING,PREFORMED
Possible match (shared part number)Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
4820-01-419-365322-021POSSIBLE MATCH
VALVE,BALL
Possible match (shared part number)Lance Valves Inc
5120-01-443-915822021POSSIBLE MATCH
HANDLE,PICKAXE
Possible match (shared part number)Link O P Handle Co
5330-01-526-192622021POSSIBLE MATCH
GASKET
Possible match (shared part number)Detroit Switch Inc Dba Detroit Switch Inc
1005-01-546-5310POSSIBLE MATCH
PIN,FIRING
Possible match (shared part number)
5305-01-574-659722021POSSIBLE MATCH
SCREW,CAP,HEXAGON HEAD
Possible match (shared part number)Spx Corporation Dba O T C Tool & Equip Division Div Spx Corp - Kent-Moore/otc Divisons
6515-01-594-233860.111.467POSSIBLE MATCH
MODULE,PLATE SET,BONE,COMPRESSIO
Possible match (shared part number)Depuy Synthes Sales Inc Dba Depuy Synthes Trauma Div Depuy Synthes Sales, Inc., D/b/a Depuy Synthes Trauma
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
22021
3/9Design control — primary reference
Waltham Clock Co Inc
Related Parts
5310-00-177-1027POSSIBLE MATCH
WASHER,FLAT
22021
5330-01-411-5865POSSIBLE MATCH
PACKING,PREFORMED
22021
4820-01-419-3653POSSIBLE MATCH
VALVE,BALL
22-021
5120-01-443-9158POSSIBLE MATCH
HANDLE,PICKAXE
22021
5330-01-526-1926POSSIBLE MATCH
GASKET
22021
1005-01-546-5310POSSIBLE MATCH
PIN,FIRING
5305-01-574-6597POSSIBLE MATCH
SCREW,CAP,HEXAGON HEAD
22021
6515-01-594-2338POSSIBLE MATCH
MODULE,PLATE SET,BONE,COMPRESSIO
60.111.467
Frequently Asked Questions
What is NSN 6645-00-166-6679?
NSN 6645-00-166-6679 is a Barrel,aircraft Clo, classified under FSC 6645, Time Measuring Instruments. Status: active.
What NSN replaces 6645-00-166-6679?
8 possible matches (shared part number, not a government interchangeability claim): 5310-00-177-1027, 5330-01-411-5865, 4820-01-419-3653. Verify interchangeability with system specifications before substitution.
Is NSN 6645-00-166-6679 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.