PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6540Ammeter

Simpson Electric Company, Inc. · NSN 6625-00-435-2849 · FSC 6625 · No Item Name Available
Verified by PartsTable
NSN 6625-00-435-2849 — this item is cataloged by the U.S. Government under National Stock Number 6625-00-435-2849. Primary manufacturer part number: 6540.
Features
  • Ammeter — FSC 6625
  • Environmental Protection: DUST RESISTANT
  • FSC Application Data: TEST SET,ELECTRONIC EQUIPMENT
  • Installation Design: PANEL
  • Mounting Arrangement Style: FOUR HOLE/STUD RECTANGULAR/SQUARE
  • Features Provided: MAGNETIC SHIELD
  • Center to Center Distance Between Mounting Facilities Parallel to Width: 2.240 INCHES NOMINAL IN
  • Power Source: EXTERNAL
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Ammeter, cataloged under National Stock Number 6625-00-435-2849, is classified within Federal Supply Class 6625 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Simpson Electric Company, Inc.. Government technical data includes 27 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6625-00-435-2849
Primary Part Number6540
Item NameAmmeter
FSC / FSG6625 / 66 — No Item Name Available
ManufacturerSimpson Electric Company, Inc.
StatusACTIVE
Environmental ProtectionDUST RESISTANT
FSC Application DataTEST SET,ELECTRONIC EQUIPMENT
Installation DesignPANEL
Mounting Arrangement StyleFOUR HOLE/STUD RECTANGULAR/SQUARE
Features ProvidedMAGNETIC SHIELD
Center to Center Distance Between Mounting Facilities Parallel to Width2.240 INCHES NOMINAL IN
Power SourceEXTERNAL
Dial Scale Marking ColorBLACK SINGLE INDICATOR SINGLE RANGE
Movement TypeMOVING COIL, PERMANENT MAGNET
Style DesignatorRECTANGULAR FLUSH MTG
ColorUNABLE TO DECODE
Meter Depth Behind Mounting Flange1.078 INCHES NOMINAL IN
Meter Body Diameter Behind Mounting Flange2.750 INCHES NOMINAL IN
Scale Graduation TypeLINEAR SINGLE INDICATOR SINGLE RANGE
Scale Division Quantity50 SINGLE INDICATOR SINGLE RANGE
Mounting Stud Length0.540 INCHES NOMINAL IN
Indicator TypeDIAL W/POINTER
Accuracy in Percent-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE
Dielectric Withstanding Voltage in Volts2000.0
Circuit Current for Which DesignedDC
Pointer ColorBLACK SINGLE INDICATOR SINGLE RANGE
Circuit Attachment Method and Quantity2 BINDING POST
Mounting Facility Type and Quantity4 THREADED STUD(S)
Mounting Stud Diameter0.138 INCHES NOMINAL IN
Center to Center Distance Between Mounting Facilities Parallel to Length2.240 INCHES NOMINAL IN
Measurement Range+0.0 TO 50.0 MILLIAMPERES, DC SINGLE INDICATOR SINGLE RANGE
Movement Suspension MethodJEWEL PIVOT BASE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeX
Verified Substitutes 12
4730-00-146-2349 INTERCHANGEABLE
Elbow,connecting
5950-00-246-2557SC-B-61153 INTERCHANGEABLE
Transformer,radio Frequency
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5960-00-501-1924 INTERCHANGEABLE
Electron Tube
6145-00-567-12951635 INTERCHANGEABLE
Wire,electrical
Belden, Inc.
5340-00-924-6114 INTERCHANGEABLE
Strap,retaining
5940-00-983-6047 INTERCHANGEABLE
Terminal Board
5330-01-090-8339 INTERCHANGEABLE
Packing,preformed
5340-01-236-21420425SS0832-7 INTERCHANGEABLE
Handle,bow
L3 Technologies, Inc. Dba Communication Systems-West Div Communication Systems-West
5935-01-326-82746540 INTERCHANGEABLE
Connector,receptacle,electrical
Micro Lambda Llc
4730-01-344-547006540 INTERCHANGEABLE
Elbow,pipe to Hose
Mitsubishi Caterpillar Forklift America, Inc
Cross-Reference Index
Part NumberManufacturer
6540 Simpson Electric Company, Inc. (USA)
1329C6540 Simpson Electric Company, Inc. (USA)
MMI-8861 Metermaster Inc Metermod Div (USA)
06540 Simpson Electric Company, Inc. (USA)
MMI-8861 Custom Metering Company Inc (USA)
Related Parts
4730-00-146-2349INTERCHANGEABLE
ELBOW,CONNECTING
5950-00-246-2557INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
SC-B-61153
5960-00-501-1924INTERCHANGEABLE
ELECTRON TUBE
6145-00-567-1295INTERCHANGEABLE
WIRE,ELECTRICAL
1635
5340-00-924-6114INTERCHANGEABLE
STRAP,RETAINING
5940-00-983-6047INTERCHANGEABLE
TERMINAL BOARD
5330-01-090-8339INTERCHANGEABLE
PACKING,PREFORMED
5340-01-236-2142INTERCHANGEABLE
HANDLE,BOW
0425SS0832-7
5935-01-326-8274INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
6540
4730-01-344-5470INTERCHANGEABLE
ELBOW,PIPE TO HOSE
06540
5136-01-431-1617INTERCHANGEABLE
DIE,THREAD CUTTING
6540
5330-01-435-8868INTERCHANGEABLE
RING,WIPER
7HD855

Frequently Asked Questions

What is NSN 6625-00-435-2849?

NSN 6625-00-435-2849 is a Ammeter, manufactured by Simpson Electric Company, Inc., classified under FSC 6625 (No Item Name Available). Status: active.

What are the part numbers for NSN 6625-00-435-2849?

NSN 6625-00-435-2849 has 5 cross-referenced part numbers: 6540 (Simpson Electric Company, Inc.), 1329C6540 (Simpson Electric Company, Inc.), MMI-8861 (Metermaster Inc Metermod Div), 06540 (Simpson Electric Company, Inc.), MMI-8861 (Custom Metering Company Inc).

What NSN replaces 6625-00-435-2849?

There are 12 known substitutes for 6625-00-435-2849: 4730-00-146-2349, 5950-00-246-2557, 5960-00-501-1924 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 6540?

Key specifications for 6540: Environmental Protection: DUST RESISTANT; FSC Application Data: TEST SET,ELECTRONIC EQUIPMENT; Installation Design: PANEL; Mounting Arrangement Style: FOUR HOLE/STUD RECTANGULAR/SQUARE. 30 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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