PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20979Chronometer

The Chelsea Clock Llc · NSN 6645-01-282-1928 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-01-282-1928 — this item is cataloged by the U.S. Government under National Stock Number 6645-01-282-1928. Primary manufacturer part number: 20979.
Features
  • Chronometer — FSC 6645
  • 4 verified cross-references
  • Primary manufacturer: The Chelsea Clock Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Chronometer, cataloged under National Stock Number 6645-01-282-1928, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is The Chelsea Clock Llc. This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameChronometer
FSC / FSG6645 — No Item Name Available (FSG 66)
ManufacturersThe Chelsea Clock Llc (CAGE 11755); Baker, Lyman & Company, Inc. Dba Baker Lyman Co (CAGE 54121)
Technical Specifications
ParameterValue
NSN6645-01-282-1928
Primary Part Number20979
Item NameChronometer
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerThe Chelsea Clock Llc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
1650-00-073-080720806 INTERCHANGEABLE
Parts Kit,servo Ass
Cadillac Gage Textron Inc.
5970-00-117-5230190-2327-00 INTERCHANGEABLE
Insulator,standoff
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
3110-00-198-142210568 INTERCHANGEABLE
Bearing,ball,annular
Itw Food Equipment Group Llc Dba Hobart Service
6910-00-333-1661 INTERCHANGEABLE
Training Aid,gas E
6645-00-399-181220806 INTERCHANGEABLE
Screw,chronometer a
Hamilton Watch Co Inc
5310-00-891-3427 INTERCHANGEABLE
Nut,plain,hexagon
5998-01-106-231320979 INTERCHANGEABLE
Circuit Card Assembly
L3 Technologies, Inc. Div Communication Systems-West
4730-01-381-8611 INTERCHANGEABLE
Elbow,pipe
3040-01-418-406520979-1 INTERCHANGEABLE
Weight,counterbalance
Elbitamerica, Inc.
6515-01-592-35124412A INTERCHANGEABLE
Blade Assembly,surgical Clipper
Carefusion 2200 Inc
Cross-Reference Index
Part NumberManufacturer
20979 PRIMARY The Chelsea Clock Llc (USA)
20806 Baker, Lyman & Company, Inc. Dba Baker Lyman Co (USA)
20806 The Chelsea Clock Llc (USA)
MQ-2 Baker, Lyman & Company, Inc. Dba Baker Lyman Co (USA)
Related Parts
1650-00-073-0807INTERCHANGEABLE
PARTS KIT,SERVO ASS
20806
5970-00-117-5230INTERCHANGEABLE
INSULATOR,STANDOFF
190-2327-00
3110-00-198-1422INTERCHANGEABLE
BEARING,BALL,ANNULAR
10568
6910-00-333-1661INTERCHANGEABLE
TRAINING AID,GAS E
6645-00-399-1812INTERCHANGEABLE
SCREW,CHRONOMETER A
20806
5310-00-891-3427INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5998-01-106-2313INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
20979
4730-01-381-8611INTERCHANGEABLE
ELBOW,PIPE
3040-01-418-4065INTERCHANGEABLE
WEIGHT,COUNTERBALANCE
20979-1
6515-01-592-3512INTERCHANGEABLE
BLADE ASSEMBLY,SURGICAL CLIPPER
4412A
5920-01-698-0091INTERCHANGEABLE
FUSE,CARTRIDGE
CCMR20

Frequently Asked Questions

What is NSN 6645-01-282-1928?

NSN 6645-01-282-1928 is a Chronometer, manufactured by The Chelsea Clock Llc, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-01-282-1928?

NSN 6645-01-282-1928 has 4 cross-referenced part numbers: 20979 (The Chelsea Clock Llc), 20806 (Baker, Lyman & Company, Inc. Dba Baker Lyman Co), 20806 (The Chelsea Clock Llc), MQ-2 (Baker, Lyman & Company, Inc. Dba Baker Lyman Co).

What NSN replaces 6645-01-282-1928?

There are 11 known substitutes for 6645-01-282-1928: 1650-00-073-0807, 5970-00-117-5230, 3110-00-198-1422 and 8 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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