PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

17421Ammeter

Simpson Electric Company, Inc. · NSN 6625-01-018-1085 · FSC 6625 · No Item Name Available
Verified by PartsTable
NSN 6625-01-018-1085 — this item is cataloged by the U.S. Government under National Stock Number 6625-01-018-1085. Primary manufacturer part number: 17421.
Features
  • Ammeter — FSC 6625
  • Circuit Attachment Method and Quantity: 2 THREADED STUD
  • Mounting Facility Type and Quantity: 4 THREADED STUD(S)
  • Movement Suspension Method: TAUT BAND
  • Mounting Arrangement Style: FOUR HOLE/STUD RECTANGULAR/SQUARE
  • Scale Division Quantity: 50 SINGLE INDICATOR SINGLE RANGE
  • Meter Body Diameter Behind Mounting Flange: 2.160 INCHES NOMINAL IN
  • Style Designator: RECTANGULAR FLUSH MTG
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Ammeter, cataloged under National Stock Number 6625-01-018-1085, 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 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6625-01-018-1085
Primary Part Number17421
Item NameAmmeter
FSC / FSG6625 / 66 — No Item Name Available
ManufacturerSimpson Electric Company, Inc.
StatusACTIVE
Circuit Attachment Method and Quantity2 THREADED STUD
Mounting Facility Type and Quantity4 THREADED STUD(S)
Movement Suspension MethodTAUT BAND
Mounting Arrangement StyleFOUR HOLE/STUD RECTANGULAR/SQUARE
Scale Division Quantity50 SINGLE INDICATOR SINGLE RANGE
Meter Body Diameter Behind Mounting Flange2.160 INCHES NOMINAL IN
Style DesignatorRECTANGULAR FLUSH MTG
Features ProvidedZERO ADJUSTER
Movement TypeMOVING IRON VANE
Installation DesignPANEL
Meter Depth Behind Mounting Flange1.340 INCHES NOMINAL IN
Mounting Stud Length53.0 MILLIMETERS NOMINAL MM
Accuracy in Percent-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE
Dial Scale Marking ColorBLACK SINGLE INDICATOR SINGLE RANGE
ColorUNABLE TO DECODE
Mounting Stud Diameter0.250 INCHES NOMINAL IN
Center to Center Distance Between Mounting Facilities Parallel to Width188.0 MILLIMETERS NOMINAL MM
Center to Center Distance Between Mounting Facilities Parallel to Length188.0 MILLIMETERS NOMINAL MM
Measurement Range+0.0 TO 100.0 MICROAMPERES, DC SINGLE INDICATOR SINGLE RANGE
Circuit Current for Which DesignedDC
Circuit Attachment Method and Quantity2 THREADED STUD
Mounting Facility Type and Quantity4 THREADED STUD(S)
Movement Suspension MethodTAUT BAND
Mounting Arrangement StyleFOUR HOLE/STUD RECTANGULAR/SQUARE
Scale Division Quantity50 SINGLE INDICATOR SINGLE RANGE
Meter Body Diameter Behind Mounting Flange2.160 INCHES NOMINAL IN
Style DesignatorRECTANGULAR FLUSH MTG
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeJ
Verified Substitutes 10
4140-00-031-2642 INTERCHANGEABLE
Impeller,fan,axial
5905-00-277-74391742-1 INTERCHANGEABLE
Resistor,fixed,film
Caddock Electronics Inc.
3030-00-934-809017420 INTERCHANGEABLE
Belt,v
Carlisle Power Transmission Products Inc
5355-00-951-0711 INTERCHANGEABLE
Dial,scale
1650-00-955-961517421 INTERCHANGEABLE
Parts Kit,valve,hyd
Eaton Aerospace Llc Dba Eaton Aerospace Jackson
5360-01-185-85331742-1 INTERCHANGEABLE
Spring,helical,compression
Droitcour Co
5330-01-207-159317421 INTERCHANGEABLE
Retainer,packing
Haskel International, Llc Dba Haskel International, Llc
5365-01-320-708517421 INTERCHANGEABLE
Spacer,sleeve
Dana Commercial Vehicle Products, Llc
5985-01-340-438117421 INTERCHANGEABLE
Strain Insulator
Dayton-Granger, Inc.
2510-01-559-690617421 INTERCHANGEABLE
Frame Section,structural,vehicul
Silver Eagle Manufacturing Co
Cross-Reference Index
Part NumberManufacturer
17421 PRIMARY Simpson Electric Company, Inc. (USA)
Related Parts
4140-00-031-2642INTERCHANGEABLE
IMPELLER,FAN,AXIAL
5905-00-277-7439INTERCHANGEABLE
RESISTOR,FIXED,FILM
1742-1
3030-00-934-8090INTERCHANGEABLE
BELT,V
17420
5355-00-951-0711INTERCHANGEABLE
DIAL,SCALE
1650-00-955-9615INTERCHANGEABLE
PARTS KIT,VALVE,HYD
17421
5360-01-185-8533INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
1742-1
5330-01-207-1593INTERCHANGEABLE
RETAINER,PACKING
17421
5365-01-320-7085INTERCHANGEABLE
SPACER,SLEEVE
17421
5985-01-340-4381INTERCHANGEABLE
STRAIN INSULATOR
17421
2510-01-559-6906INTERCHANGEABLE
FRAME SECTION,STRUCTURAL,VEHICUL
17421

Frequently Asked Questions

What is NSN 6625-01-018-1085?

NSN 6625-01-018-1085 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 6625-01-018-1085?

NSN 6625-01-018-1085 has 1 cross-referenced part number: 17421 (Simpson Electric Company, Inc.).

What NSN replaces 6625-01-018-1085?

There are 10 known substitutes for 6625-01-018-1085: 4140-00-031-2642, 5905-00-277-7439, 3030-00-934-8090 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 17421?

Key specifications for 17421: Circuit Attachment Method and Quantity: 2 THREADED STUD; Mounting Facility Type and Quantity: 4 THREADED STUD(S); Movement Suspension Method: TAUT BAND; 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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