PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

25SAmmeter

Simpson Electric Company, Inc. · NSN 6625-00-539-8733 · FSC 6625 · No Item Name Available
Verified by PartsTable
NSN 6625-00-539-8733 — this item is cataloged by the U.S. Government under National Stock Number 6625-00-539-8733. Primary manufacturer part number: 25S.
Features
  • Ammeter — FSC 6625
  • Meter Body Diameter Behind Mounting Flange: 2.750 INCHES NOMINAL IN
  • Installation Design: PANEL
  • Meter Depth Behind Mounting Flange: 1.170 INCHES NOMINAL IN
  • Color: UNABLE TO DECODE
  • Overall Diameter: 3.500 INCHES NOMINAL IN
  • Dial Scale Marking Color: BLACK SINGLE INDICATOR SINGLE RANGE
  • Accuracy in Percent: -2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Ammeter, cataloged under National Stock Number 6625-00-539-8733, 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 30 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6625-00-539-8733
Primary Part Number25S
Item NameAmmeter
FSC / FSG6625 / 66 — No Item Name Available
ManufacturerSimpson Electric Company, Inc.
StatusACTIVE
Meter Body Diameter Behind Mounting Flange2.750 INCHES NOMINAL IN
Installation DesignPANEL
Meter Depth Behind Mounting Flange1.170 INCHES NOMINAL IN
ColorUNABLE TO DECODE
Overall Diameter3.500 INCHES NOMINAL IN
Dial Scale Marking ColorBLACK SINGLE INDICATOR SINGLE RANGE
Accuracy in Percent-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE
Scale Division Quantity50 SINGLE INDICATOR SINGLE RANGE
Mounting Arrangement StyleTHREE HOLE/STUD TRIANGULAR
Style DesignatorROUND FLUSH MTG
FSC Application DataTEST SET,ELECT. EQUIP.
Center to Center Distance Between Mounting Facilities Parallel to Width1.500 INCHES NOMINAL IN
Circuit Attachment Method and Quantity2 BINDING POST
Reliability IndicatorNOT ESTABLISHED
Circuit Current for Which DesignedDC
Mounting Facility Type and Quantity3 FLANGE
Center to Center Distance Between Mounting Facilities Parallel to Length1.500 INCHES NOMINAL IN
Measurement Range+0.0 TO 125.0 AMPERES, DC SINGLE INDICATOR SINGLE RANGE
Meter Body Diameter Behind Mounting Flange2.750 INCHES NOMINAL IN
Installation DesignPANEL
Meter Depth Behind Mounting Flange1.170 INCHES NOMINAL IN
ColorUNABLE TO DECODE
Overall Diameter3.500 INCHES NOMINAL IN
Dial Scale Marking ColorBLACK SINGLE INDICATOR SINGLE RANGE
Accuracy in Percent-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE
Scale Division Quantity50 SINGLE INDICATOR SINGLE RANGE
Mounting Arrangement StyleTHREE HOLE/STUD TRIANGULAR
Style DesignatorROUND FLUSH MTG
FSC Application DataTEST SET,ELECT. EQUIP.
Center to Center Distance Between Mounting Facilities Parallel to Width1.500 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Weight0.0100 lbs
Cube0.0010 cu ft
Verified Substitutes 12
6220-00-056-6751 INTERCHANGEABLE
Light,dome
6750-00-286-269025S INTERCHANGEABLE
Paper,copying,diazo Process
Diazo Specialty Co Dba Dsc Systems Graphics
5120-00-293-3006HSF-25S INTERCHANGEABLE
Face,hammer,inserted
Williams J H Industrial Products Inc
5360-00-320-3106S8201-838068PC25 INTERCHANGEABLE
Spring,helical,extension
Naval Ship Systems Command
6625-00-539-8734 INTERCHANGEABLE
Voltmeter
3820-00-634-9344 INTERCHANGEABLE
Sheeting Driver Head,paving Brea
6685-00-954-844925S INTERCHANGEABLE
Dampener,fluid Pressure
Chemiquip Products Co Inc
6680-00-963-847525S INTERCHANGEABLE
Snubber
Ashcroft Inc Dba Heise
3439-00-971-8930SI-25S 25W INTERCHANGEABLE
Soldering Iron,electric
Hexacon Electric Company
4320-01-051-857025S INTERCHANGEABLE
Motor,hydraulic
Lockheed Martin Corporation Div Rms
Cross-Reference Index
Part NumberManufacturer
25S Simpson Electric Company, Inc. (USA)
25S-0 TO 125ADC Simpson Electric Company, Inc. (USA)
Related Parts
6220-00-056-6751INTERCHANGEABLE
LIGHT,DOME
6750-00-286-2690INTERCHANGEABLE
PAPER,COPYING,DIAZO PROCESS
25S
5120-00-293-3006INTERCHANGEABLE
FACE,HAMMER,INSERTED
HSF-25S
5360-00-320-3106INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
S8201-838068PC25
6625-00-539-8734INTERCHANGEABLE
VOLTMETER
3820-00-634-9344INTERCHANGEABLE
SHEETING DRIVER HEAD,PAVING BREA
6685-00-954-8449INTERCHANGEABLE
DAMPENER,FLUID PRESSURE
25S
6680-00-963-8475INTERCHANGEABLE
SNUBBER
25S
3439-00-971-8930INTERCHANGEABLE
SOLDERING IRON,ELECTRIC
SI-25S 25W
4320-01-051-8570INTERCHANGEABLE
MOTOR,HYDRAULIC
25S
6350-01-169-2535INTERCHANGEABLE
TESTER,SMOKE DETECTOR
729-196-00
6685-01-285-0323INTERCHANGEABLE
DAMPENER,FLUID PRESSURE

Frequently Asked Questions

What is NSN 6625-00-539-8733?

NSN 6625-00-539-8733 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 6625-00-539-8733?

NSN 6625-00-539-8733 has 2 cross-referenced part numbers: 25S (Simpson Electric Company, Inc.), 25S-0 TO 125ADC (Simpson Electric Company, Inc.).

What NSN replaces 6625-00-539-8733?

There are 12 known substitutes for 6625-00-539-8733: 6220-00-056-6751, 6750-00-286-2690, 5120-00-293-3006 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 25S?

Key specifications for 25S: Meter Body Diameter Behind Mounting Flange: 2.750 INCHES NOMINAL IN; Installation Design: PANEL; Meter Depth Behind Mounting Flange: 1.170 INCHES NOMINAL IN; Color: UNABLE TO DECODE. 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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