PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

23046Heart,second

Waltham Clock Co Inc · NSN 6645-00-535-4378 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-535-4378 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-535-4378. Primary manufacturer part number: 23046.
Features
  • Heart,second — FSC 6645
  • 1 verified cross-reference
  • Primary manufacturer: Waltham Clock Co Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heart,second, cataloged under National Stock Number 6645-00-535-4378, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Waltham Clock Co Inc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameHeart,second
FSC / FSG6645 — No Item Name Available (FSG 66)
ManufacturersWaltham Clock Co Inc (CAGE 79300)
Technical Specifications
ParameterValue
NSN6645-00-535-4378
Primary Part Number23046
Item NameHeart,second
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerWaltham Clock Co Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5305-00-054-6654 INTERCHANGEABLE
Screw,machine
5330-00-078-085423046 INTERCHANGEABLE
Gasket
Setra Systems, Inc. Dba Gems Sensors
5305-00-253-5618MS21318-27 INTERCHANGEABLE
Screw,drive
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5330-00-470-548123046 INTERCHANGEABLE
Seal,plain Encased
Skf Usa Inc. Dba Skf Aerospace Sealing Solutions
5360-00-758-798723046 INTERCHANGEABLE
Spring,helical,compression
Moog Inc
3455-00-812-626651-10357 INTERCHANGEABLE
Cutter,milling,end
Union Butterfield Corp P O Box 9000 Crystal Lake Il 60039
4720-00-936-358223046 INTERCHANGEABLE
Hose,nonmetallic
Whirlpool Corp Dba Whirlpool Corp
5305-01-590-867223046 INTERCHANGEABLE
Screw,machine
Charles Reed Knight Jr Dba Knight's Armament Company
3455-01-625-453523046 INTERCHANGEABLE
Cutter,engraving
Gravograph-New Hermes, Inc
Cross-Reference Index
Part NumberManufacturer
23046 Waltham Clock Co Inc (USA)
Related Parts
5305-00-054-6654INTERCHANGEABLE
SCREW,MACHINE
5330-00-078-0854INTERCHANGEABLE
GASKET
23046
5305-00-253-5618INTERCHANGEABLE
SCREW,DRIVE
MS21318-27
5330-00-470-5481INTERCHANGEABLE
SEAL,PLAIN ENCASED
23046
5360-00-758-7987INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
23046
3455-00-812-6266INTERCHANGEABLE
CUTTER,MILLING,END
51-10357
4720-00-936-3582INTERCHANGEABLE
HOSE,NONMETALLIC
23046
5305-01-590-8672INTERCHANGEABLE
SCREW,MACHINE
23046
3455-01-625-4535INTERCHANGEABLE
CUTTER,ENGRAVING
23046

Frequently Asked Questions

What is NSN 6645-00-535-4378?

NSN 6645-00-535-4378 is a Heart,second, manufactured by Waltham Clock Co Inc, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-00-535-4378?

NSN 6645-00-535-4378 has 1 cross-referenced part number: 23046 (Waltham Clock Co Inc).

What NSN replaces 6645-00-535-4378?

There are 9 known substitutes for 6645-00-535-4378: 5305-00-054-6654, 5330-00-078-0854, 5305-00-253-5618 and 6 more. Verify interchangeability with system specifications before substitution.

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