The Ammeter, cataloged under National Stock Number 6625-01-181-6444, is classified within Federal Supply Class 6625 (Electrical and Electronic Properties Measuring and Testing Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 6625-01-181-6444 |
| Primary Part Number | 4400D0750-16 |
| Item Name | Ammeter |
| FSC / FSG | 6625 / 66 — Electrical and Electronic Properties Measuring and Testing Instruments |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Circuit Construction Type | NONELECTRONIC |
| Mounting Facility Type and Quantity | 4 SCREW AND 4 UNTHREADED HOLE(S) |
| Meter Body Diameter Behind Mounting Flange | 1.510 INCHES MAXIMUM IN |
| FSC Application Data | ELECTRICAL,ELECTRONIC PROPERTIES MEASURING AND TEST INSTRUMENTS |
| Indicator Type | DIAL W/POINTER |
| Mounting Arrangement Style | FOUR HOLE/STUD RECTANGULAR/SQUARE |
| Circuit Attachment Method and Quantity | 2 SOLDER LUG AND 2 SOLDER STUD |
| Meter Depth Behind Mounting Flange | 1.000 INCHES MAXIMUM IN |
| Circuit Current for Which Designed | DC |
| Movement Type | MOVING COIL, PERMANENT MAGNET |
| Accuracy in Percent | -3.0 TO 3.0 AT FULL SCALE SINGLE INDICATOR SINGLE RANGE |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 1.318 INCHES MAXIMUM IN |
| Panel for Which Designed | MAGNETIC OR NONMAGNETIC |
| Dielectric Withstanding Voltage in Volts | 1500.0 |
| Power Source | EXTERNAL |
| Style Designator | RECTANGULAR FLUSH MTG |
| Mounting Hole Diameter | 0.125 INCHES NOMINAL IN |
| Features Provided | MAGNETIC SHIELD AND ZERO ADJUSTER |
| Scale Division Quantity | 30 SINGLE INDICATOR SINGLE RANGE |
| Movement Suspension Method | JEWEL PIVOT BASE |
| Color | UNABLE TO DECODE |
| Pointer Color | BLACK SINGLE INDICATOR SINGLE RANGE |
| Surface Treatment | ENAMEL SEMIGLOSS |
| Environmental Protection | AIRTIGHT AND DUST RESISTANT AND FUNGUS RESISTANT AND HEAT RESISTANT AND HUMIDITY RESISTANT AND SHOCK RESISTANT AND VIBRATION RESISTANT AND WATER RESISTANT |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 1.318 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Shelf Life Code | 0 |
| Criticality Code | X |
| Unit of Issue | EA |
| Acquisition advice code | J |
| Weight | 0.4200 lbs |
| Cube | 0.0360 cu ft |
| Part Number | Manufacturer |
|---|---|
| 4400D0750-16 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 135-289 | Jewell Instruments Llc (USA) |
| 618-E556 | Phaostron Instrument and Electronic Company (USA) |
NSN 6625-01-181-6444 is a Ammeter, manufactured by Northrop Grumman Systems Corporation, classified under FSC 6625, Electrical and Electronic Properties Measuring and Testing Instruments. Status: active.
NSN 6625-01-181-6444 has 3 manufacturer part numbers on file: 4400D0750-16 (Northrop Grumman Systems Corporation), 135-289 (Jewell Instruments Llc), 618-E556 (Phaostron Instrument and Electronic Company).
2 possible matches (shared part number, not a government interchangeability claim): 2915-01-483-4603, 4920-01-573-8679. Verify interchangeability with system specifications before substitution.
Key specifications for 4400D0750-16: Circuit Construction Type: NONELECTRONIC; Mounting Facility Type and Quantity: 4 SCREW AND 4 UNTHREADED HOLE(S); Meter Body Diameter Behind Mounting Flange: 1.510 INCHES MAXIMUM IN; Overall Height: 1.734 INCHES MINIMUM AND 1.805 INCHES MAXIMUM IN. 25 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.