PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ZM4UBridge,resistance

Joint Electronics Type Designation System · NSN 6625-00-166-0398 · FSC 6625 · No Item Name Available
Verified by PartsTable
NSN 6625-00-166-0398 — this item is cataloged by the U.S. Government under National Stock Number 6625-00-166-0398. Primary manufacturer part number: ZM4U.
Features
  • Bridge,resistance — FSC 6625
  • Relationship to Similar Equipment: WHEN EXHAUSTED USE 6625007774402; INTERCHANGEABLE W/ 6625002434845,6625005728800,6625006492868,6625000600960,6625004901724,6625006493055,6625004460,6625005538240; SUITABLE SUBSTITUTE 6625004041592
  • Reference Data and Literature: DEPT OF ARMY PUBLICATIONS: TM-2019 W/ CHANGES 1&3 OCT 57,TM11-6625-249-12P JUN 57,TM11-6625-249-35P JUL 59,TB11-6625-249-35/1; LEEDS & NORTHRUP 5-5300 W
  • Material: WOOD CASE
  • Balance Indicator Type: GALVANOMETER
  • Scale Calibration: 0 TO 10 MEG OHMS RESISTANCE
  • Adjustment Method: ROTARY SWITCH
  • Scale Overall Accuracy Rating in Percent: -0.150 TO 0.150
Applications
  • Applications requiring Wood Case construction
General Description

The Bridge,resistance, cataloged under National Stock Number 6625-00-166-0398, is classified within Federal Supply Class 6625 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Joint Electronics Type Designation System. Government technical data includes 24 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 9 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6625-00-166-0398
Primary Part NumberZM4U
Item NameBridge,resistance
FSC / FSG6625 / 66 — No Item Name Available
ManufacturerJoint Electronics Type Designation System
StatusCANCELLED
Relationship to Similar EquipmentWHEN EXHAUSTED USE 6625007774402; INTERCHANGEABLE W/ 6625002434845,6625005728800,6625006492868,6625000600960,6625004901724,6625006493055,6625004460,6625005538240; SUITABLE SUBSTITUTE 6625004041592
Reference Data and LiteratureDEPT OF ARMY PUBLICATIONS: TM-2019 W/ CHANGES 1&3 OCT 57,TM11-6625-249-12P JUN 57,TM11-6625-249-35P JUL 59,TB11-6625-249-35/1; LEEDS & NORTHRUP 5-5300 W
MaterialWOOD CASE
Balance Indicator TypeGALVANOMETER
Scale Calibration0 TO 10 MEG OHMS RESISTANCE
Adjustment MethodROTARY SWITCH
Scale Overall Accuracy Rating in Percent-0.150 TO 0.150
Functional DescriptionA PORTABLE WHEATSTONE BRIDGE USED TO MEASURE DC RESISTANCE OF ELECTRICAL COMPONENTS & AS AUXILIARY RESISTANCE BOXES; USED TO SUPPORT AN/ARN-30 ( ),AN/ASN-23,AN/ASN-23,AN/ASN-43,& PU-542( )/A
Functional ClassificationAA-1.3
DC Voltage Rating1.5 VOLTS NOMINAL
Entry Date70-08-15
Type/model DesignationZM-4( )/U
Relationship to Similar EquipmentWHEN EXHAUSTED USE 6625007774402; INTERCHANGEABLE W/ 6625002434845,6625005728800,6625006492868,6625000600960,6625004901724,6625006493055,6625004460,6625005538240; SUITABLE SUBSTITUTE 6625004041592
Reference Data and LiteratureDEPT OF ARMY PUBLICATIONS: TM-2019 W/ CHANGES 1&3 OCT 57,TM11-6625-249-12P JUN 57,TM11-6625-249-35P JUL 59,TB11-6625-249-35/1; LEEDS & NORTHRUP 5-5300 W
MaterialWOOD CASE
Balance Indicator TypeGALVANOMETER
Scale Calibration0 TO 10 MEG OHMS RESISTANCE
Adjustment MethodROTARY SWITCH
Scale Overall Accuracy Rating in Percent-0.150 TO 0.150
Functional DescriptionA PORTABLE WHEATSTONE BRIDGE USED TO MEASURE DC RESISTANCE OF ELECTRICAL COMPONENTS & AS AUXILIARY RESISTANCE BOXES; USED TO SUPPORT AN/ARN-30 ( ),AN/ASN-23,AN/ASN-23,AN/ASN-43,& PU-542( )/A
Functional ClassificationAA-1.3
DC Voltage Rating1.5 VOLTS NOMINAL
Entry Date70-08-15
Type/model DesignationZM-4( )/U
Lifecycle & Compliance
Acquisition StatusCANCELLED
Successor6625-00-296-3466 (5300)
HAZMATNo
Shelf Life Code0
Criticality CodeS
Unit of IssueEA
SMR CodeVS
Weight11.3500 lbs
Cube0.8125 cu ft
Verified Substitutes 7
6625-00-296-34665300 SUCCESSOR
Generator,sweep
Krohn-Hite Corp
7045-01-218-04945300 SUCCESSOR
Case,floppy Diskette
Maxell Corporation of America Dba (foreign Parent Is Hitachi Maxell Ltd, Osaka, Japan) Div Professional Media Products Group
6625-01-482-97835300 SUCCESSOR
Test Set,synchro
North Atlantic Industries, Inc. Dba North Atlantic Industries
4730-00-145-6175841-532 INTERCHANGEABLE
Adapter,straight,tube to Hose
Rolls-Royce Controls and Data Services Limited
7035-00-231-2869 INTERCHANGEABLE
Card Programmer
5915-00-503-2268841532 INTERCHANGEABLE
Suppressor,parasitic
Lockheed Martin Corporation Div Rms - Mitchel Field
3040-01-446-439684153-2 INTERCHANGEABLE
Shaft,shouldered
Oeco, Llc Dba Pacific Scientific Oeco
Cross-Reference Index
Part NumberManufacturer
ZM4U Naval Ship Systems Command (USA)
5300 Leeds and Northrup Co a Unit of General Signal Corp (USA)
ANZM4U Leeds and Northrup Co a Unit of General Signal Corp (USA)
5300TYPES Leeds and Northrup Co a Unit of General Signal Corp (USA)
ZM4U Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
5300S1 Leeds and Northrup Co a Unit of General Signal Corp (USA)
841532 Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Us Army Research, Development and Engineering Command Armament (USA)
ZM4U PRIMARY Joint Electronics Type Designation System (USA)
ANZM4U Joint Electronics Type Designation System (USA)
Related Parts
SUCCESSOR 6625-00-296-3466 Generator,sweep · 5300
7045-01-218-0494SUCCESSOR
CASE,FLOPPY DISKETTE
5300
6625-01-482-9783SUCCESSOR
TEST SET,SYNCHRO
5300
4730-00-145-6175INTERCHANGEABLE
ADAPTER,STRAIGHT,TUBE TO HOSE
841-532
7035-00-231-2869INTERCHANGEABLE
CARD PROGRAMMER
5915-00-503-2268INTERCHANGEABLE
SUPPRESSOR,PARASITIC
841532
3040-01-446-4396INTERCHANGEABLE
SHAFT,SHOULDERED
84153-2

Frequently Asked Questions

What is NSN 6625-00-166-0398?

NSN 6625-00-166-0398 is a Bridge,resistance, manufactured by Joint Electronics Type Designation System, classified under FSC 6625 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6625-00-166-0398?

NSN 6625-00-166-0398 has 9 cross-referenced part numbers: ZM4U (Naval Ship Systems Command), 5300 (Leeds and Northrup Co a Unit of General Signal Corp), ANZM4U (Leeds and Northrup Co a Unit of General Signal Corp), 5300TYPES (Leeds and Northrup Co a Unit of General Signal Corp), ZM4U (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M) and 4 more.

What NSN replaces 6625-00-166-0398?

There are 7 known substitutes for 6625-00-166-0398: 6625-00-296-3466, 7045-01-218-0494, 6625-01-482-9783 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ZM4U?

Key specifications for ZM4U: Relationship to Similar Equipment: WHEN EXHAUSTED USE 6625007774402; INTERCHANGEABLE W/ 6625002434845,6625005728800,6625006492868,6625000600960,6625004901724,6625006493055,6625004460,6625005538240; SUITABLE SUBSTITUTE 6625004041592; Reference Data and Literature: DEPT OF ARMY PUBLICATIONS: TM-2019 W/ CHANGES 1&3 OCT 57,TM11-6625-249-12P JUN 57,TM11-6625-249-35P JUL 59,TB11-6625-249-35/1; LEEDS & NORTHRUP 5-5300 W; Material: WOOD CASE; Balance Indicator Type: GALVANOMETER. 30 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6625-00-166-0398 still in active supply?

NSN 6625-00-166-0398 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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