PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MS21341A-21Meter,time Totalizing

Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M · NSN 6645-01-420-6804 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-01-420-6804 — this item is cataloged by the U.S. Government under National Stock Number 6645-01-420-6804. Primary manufacturer part number: MS21341A-21.
Features
  • Meter,time Totalizing — FSC 6645
  • Indicator Type: DIGITAL COUNTER
  • Unit Type: MOUNTED
  • Mounting Type: FLANGE
  • 4 verified cross-references
  • Primary manufacturer: Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Meter,time Totalizing, cataloged under National Stock Number 6645-01-420-6804, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6645-01-420-6804
Primary Part NumberMS21341A-21
Item NameMeter,time Totalizing
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerMilitary Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Indicator TypeDIGITAL COUNTER
Unit TypeMOUNTED
Mounting TypeFLANGE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
6645-00-255-1371 INTERCHANGEABLE
Meter,time Totalizing
6645-01-306-7243 INTERCHANGEABLE
Meter,time Totalizing
6645-01-308-2260 INTERCHANGEABLE
Meter,time Totalizing
6645-01-352-5426 INTERCHANGEABLE
Meter,time Totalizing
6645-01-357-9096 INTERCHANGEABLE
Meter,time Totalizing
Cross-Reference Index
Part NumberManufacturer
MS21341A-21 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
MIL-M-7793F Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M7793/1-023 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M7793/1-23 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6645-00-255-1371INTERCHANGEABLE
METER,TIME TOTALIZING
6645-01-306-7243INTERCHANGEABLE
METER,TIME TOTALIZING
6645-01-308-2260INTERCHANGEABLE
METER,TIME TOTALIZING
6645-01-352-5426INTERCHANGEABLE
METER,TIME TOTALIZING
6645-01-357-9096INTERCHANGEABLE
METER,TIME TOTALIZING

Frequently Asked Questions

What is NSN 6645-01-420-6804?

NSN 6645-01-420-6804 is a Meter,time Totalizing, manufactured by Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-01-420-6804?

NSN 6645-01-420-6804 has 4 cross-referenced part numbers: MS21341A-21 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MIL-M-7793F (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M7793/1-023 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M7793/1-23 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6645-01-420-6804?

There are 5 known substitutes for 6645-01-420-6804: 6645-00-255-1371, 6645-01-306-7243, 6645-01-308-2260 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MS21341A-21?

Key specifications for MS21341A-21: Indicator Type: DIGITAL COUNTER; Unit Type: MOUNTED; End Item Identification: AIRCRAFT,AWACS,E-3A A; Mounting Type: FLANGE. 4 total characteristics are documented in the Federal Logistics Information System.

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