The Resistor,fixed,wire Wound,induct, cataloged under National Stock Number 5905-00-439-5378, is classified within Federal Supply Class 5905 (Resistor) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Weston Aerospace Ltd Div Weston Aerospace Ltd. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5905-00-439-5378 |
| Primary Part Number | R.2.550 |
| Item Name | Resistor,fixed,wire Wound,induct |
| FSC / FSG | 5905 / 59 — Resistor |
| Manufacturer | Weston Aerospace Ltd Div Weston Aerospace Ltd |
| Status | ACTIVE |
| Resistance Tolerance in Percent | -1.000 TO 1.000 |
| Temp Coefficient of Resistance in Ppm Per Deg Celsius | -50.0 TO 50.0 |
| Electrical Resistance | 8.450 OHMS |
| Inclosure Type | ENCAPSULATED |
| Mounting Hole Size | 0.260 INCHES NOMINAL IN |
| Terminal Type | TAB, SOLDER LUG |
| Distance Between Centerlines of Mounting Facilities Parallel to Body Length | 1.750 INCHES NOMINAL IN |
| Terminal Length | 0.694 INCHES MAXIMUM IN |
| Body Width | 0.500 INCHES MAXIMUM IN |
| Body Height | 0.470 INCHES MAXIMUM IN |
| Temp Range of Temp Coefficient in Deg Celsius | -55.0 TO 125.0 |
| Style Designator | TERMINALS EACH END |
| Power Dissipation Rating in Watts | 0.500 FREE AIR |
| Ambient Temp at Full Rated Power | 25.0 CELSIUS DEGC |
| Body Length | 0.880 INCHES MAXIMUM IN |
| Ambient Temp in Deg Celsius at Zero Percent Rated Power | 125.0 |
| Reliability Indicator | NOT ESTABLISHED |
| Cubic Measure | 0.361 CUBIC INCHES |
| Terminal Width | 0.500 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6862400-42 | Rolls-Royce Airlines (GBR) |
| 6862400-42 | Allison Transmission Inc Dba Allison Transmission, Inc (USA) |
| L961543 | Rolls-Royce Airlines (GBR) |
| R.2.550 PRIMARY | Weston Aerospace Ltd Div Weston Aerospace Ltd (GBR) |
| Reference | Meaning |
|---|---|
| R.2.550 | 5/9 Secondary reference Weston Aerospace |
| R.2.550 | 5/9 Secondary reference Esterline Sensors Services Americas Inc Div Esterline Sensors Servces Americas Inc. |
NSN 5905-00-439-5378 is a Resistor,fixed,wire Wound,induct, manufactured by Weston Aerospace Ltd Div Weston Aerospace Ltd, classified under FSC 5905, Resistor. Status: active.
NSN 5905-00-439-5378 has 4 manufacturer part numbers on file: 6862400-42 (Rolls-Royce Airlines), 6862400-42 (Allison Transmission Inc Dba Allison Transmission, Inc), L961543 (Rolls-Royce Airlines), R.2.550 (Weston Aerospace Ltd Div Weston Aerospace Ltd).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-261-2435. Verify interchangeability with system specifications before substitution.
Key specifications for R.2.550: Resistance Tolerance in Percent: -1.000 TO 1.000; Temp Coefficient of Resistance in Ppm Per Deg Celsius: -50.0 TO 50.0; Electrical Resistance: 8.450 OHMS; Inclosure Type: ENCAPSULATED. 19 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.