PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20806Screw,chronometer a

Hamilton Watch Co Inc · NSN 6645-00-399-1812 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-399-1812 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-399-1812. Primary manufacturer part number: 20806.
Features
  • Screw,chronometer a — FSC 6645
  • 2 verified cross-references
  • Primary manufacturer: Hamilton Watch Co Inc
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Screw,chronometer a, cataloged under National Stock Number 6645-00-399-1812, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Hamilton Watch Co Inc. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameScrew,chronometer a
FSC / FSG6645 — No Item Name Available (FSG 66)
ManufacturersHamilton Watch Co Inc (CAGE 26992)
Technical Specifications
ParameterValue
NSN6645-00-399-1812
Primary Part Number20806
Item NameScrew,chronometer a
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerHamilton Watch Co Inc
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
1650-00-073-080720806 INTERCHANGEABLE
Parts Kit,servo Ass
Cadillac Gage Textron Inc.
3110-00-198-142210568 INTERCHANGEABLE
Bearing,ball,annular
Itw Food Equipment Group Llc Dba Hobart Service
5310-00-891-3427 INTERCHANGEABLE
Nut,plain,hexagon
6645-01-282-192820979 INTERCHANGEABLE
Chronometer
The Chelsea Clock Llc
4730-01-381-8611 INTERCHANGEABLE
Elbow,pipe
6515-01-592-35124412A INTERCHANGEABLE
Blade Assembly,surgical Clipper
Carefusion 2200 Inc
Cross-Reference Index
Part NumberManufacturer
20806 PRIMARY Hamilton Watch Co Inc (USA)
HAM20806 PRIMARY Hamilton Watch Co Inc (USA)
Related Parts
1650-00-073-0807INTERCHANGEABLE
PARTS KIT,SERVO ASS
20806
3110-00-198-1422INTERCHANGEABLE
BEARING,BALL,ANNULAR
10568
5310-00-891-3427INTERCHANGEABLE
NUT,PLAIN,HEXAGON
6645-01-282-1928INTERCHANGEABLE
CHRONOMETER
20979
4730-01-381-8611INTERCHANGEABLE
ELBOW,PIPE
6515-01-592-3512INTERCHANGEABLE
BLADE ASSEMBLY,SURGICAL CLIPPER
4412A

Frequently Asked Questions

What is NSN 6645-00-399-1812?

NSN 6645-00-399-1812 is a Screw,chronometer a, manufactured by Hamilton Watch Co Inc, classified under FSC 6645 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6645-00-399-1812?

NSN 6645-00-399-1812 has 2 cross-referenced part numbers: 20806 (Hamilton Watch Co Inc), HAM20806 (Hamilton Watch Co Inc).

What NSN replaces 6645-00-399-1812?

There are 6 known substitutes for 6645-00-399-1812: 1650-00-073-0807, 3110-00-198-1422, 5310-00-891-3427 and 3 more. Verify interchangeability with system specifications before substitution.

Is NSN 6645-00-399-1812 still in active supply?

NSN 6645-00-399-1812 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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