PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

22227Hairspring

Waltham Clock Co Inc · NSN 6645-00-371-1859 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-371-1859 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-371-1859. Primary manufacturer part number: 22227.
Features
  • Hairspring — 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 Hairspring, cataloged under National Stock Number 6645-00-371-1859, 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameHairspring
FSC / FSG6645 — No Item Name Available (FSG 66)
ManufacturersWaltham Clock Co Inc (CAGE 79300)
Technical Specifications
ParameterValue
NSN6645-00-371-1859
Primary Part Number22227
Item NameHairspring
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerWaltham Clock Co Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
3110-00-155-745507100-07204 INTERCHANGEABLE
Bearing,roller,tapered
The Timken Corporation
5305-00-763-7827MS51959-18 INTERCHANGEABLE
Screw,machine
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
6240-00-851-435210051850 INTERCHANGEABLE
Lamp,incandescent
Us Army Aviation and Missile Command
6920-00-894-7380 INTERCHANGEABLE
Blade
3455-01-130-245819640 INTERCHANGEABLE
Reamer,machine
Brown & Sharpe, Inc. Div Precision Measuring Instruments, Tesa Usa
7050-01-588-821722227 INTERCHANGEABLE
Memory,portable,solid State
Pinnacle Systems Inc
4320-01-656-659322227 INTERCHANGEABLE
Shaft,transmission,pump
Itt Jabsco Products
Cross-Reference Index
Part NumberManufacturer
22227 Waltham Clock Co Inc (USA)
Related Parts
3110-00-155-7455INTERCHANGEABLE
BEARING,ROLLER,TAPERED
07100-07204
5305-00-763-7827INTERCHANGEABLE
SCREW,MACHINE
MS51959-18
6240-00-851-4352INTERCHANGEABLE
LAMP,INCANDESCENT
10051850
6920-00-894-7380INTERCHANGEABLE
BLADE
3455-01-130-2458INTERCHANGEABLE
REAMER,MACHINE
19640
7050-01-588-8217INTERCHANGEABLE
MEMORY,PORTABLE,SOLID STATE
22227
4320-01-656-6593INTERCHANGEABLE
SHAFT,TRANSMISSION,PUMP
22227

Frequently Asked Questions

What is NSN 6645-00-371-1859?

NSN 6645-00-371-1859 is a Hairspring, manufactured by Waltham Clock Co Inc, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-00-371-1859?

NSN 6645-00-371-1859 has 1 cross-referenced part number: 22227 (Waltham Clock Co Inc).

What NSN replaces 6645-00-371-1859?

There are 7 known substitutes for 6645-00-371-1859: 3110-00-155-7455, 5305-00-763-7827, 6240-00-851-4352 and 4 more. Verify interchangeability with system specifications before substitution.

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