The Resistor,variable,wire Wound,pre, cataloged under National Stock Number 5905-01-287-2252, is classified within Federal Supply Class 5905 (Resistor) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments. Government technical data includes 30 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5905-01-287-2252 |
| Primary Part Number | 55-50-284 |
| Item Name | Resistor,variable,wire Wound,pre |
| FSC / FSG | 5905 / 59 — Resistor |
| Manufacturer | Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments |
| Status | ACTIVE |
| Maximum Running Torque | 6.00 INCH-OUNCES IN |
| Nonturn Device Location | AT 3 OCLOCK |
| Body Diameter | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Screw Thread Quantity Per Inch | 32.0 |
| Electrical Resistance Per Section | 5.0 KILOHMS SINGLE SECTION |
| Switch Voltage Rating in Volts | 28.0 |
| Ambient Temp in Deg Celsius Per Section at Zero Percent Rated Power | 135.0 SINGLE SECTION |
| Section Quantity | 1 |
| Shaft Diameter | 0.248 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Nonturn Device Radius | 0.375 INCHES NOMINAL IN |
| Fragility Factor | MODERATELY RUGGED |
| Switch Operating Position | START OF ROTATION |
| Function Characteristic Per Section | SINGLE SECTION LINEAR |
| Body Style | CYLINDRICAL BUSHING MOUNTED |
| Function Conformity Tolerance Per Section | -1.00 TO 1.00 SINGLE SECTION |
| First Flat Length | 0.487 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN |
| Mounting Method | STANDARD BUSHING |
| Maximum Starting Torque | 15.00 INCH-OUNCES IN |
| Terminal Location | RADIALLY POSITIONED OVER LESS THAN HALF THE CIRCUMFERENCE LOCATION NOT OTHERWISE SPECIFIED |
| Features Provided | HUMIDITY PROOF AND SHAFT SEAL AND SWITCH |
| Shaft Style | ROUND, FLATTED |
| Actuator Type | SINGLE SHAFT |
| Shaft Length | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Body Length | 1.458 INCHES MINIMUM AND 1.478 INCHES MAXIMUM IN |
| Maximum Stop Torque | 240.00 INCH-OUNCES IN |
| Power Dissipation Rating Per Section in Watts | 4.0 FREE AIR SINGLE SECTION |
| Switch Type | ROTARY |
| Effective Electrical Rotation in Deg Angular Rotation | 265.0 MINIMUM AND 275.0 MAXIMUM |
| Screw Thread Diameter | 0.375 INCHES NOMINAL IN |
| Bearing Type | SLEEVE SHAFT |
| 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 |
|---|---|
| 14WB2 | Servo Instrument Corporation (USA) |
| 55-50-284 PRIMARY | Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments (USA) |
| 78G-0001-002 | Greystone Electronics Corp (USA) |
| Reference | Meaning |
|---|---|
| SP128 | 5/9 Secondary reference U.S. Government activity |
| SP128 | 5/9 Secondary reference Data Instruments Inc |
| 5M1680-002 | 5/9 Secondary reference The Boeing Company Div Defense |
NSN 5905-01-287-2252 is a Resistor,variable,wire Wound,pre, manufactured by Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments, classified under FSC 5905, Resistor. Status: active.
NSN 5905-01-287-2252 has 3 manufacturer part numbers on file: 14WB2 (Servo Instrument Corporation), 55-50-284 (Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments), 78G-0001-002 (Greystone Electronics Corp).
1 possible match (shared part number, not a government interchangeability claim): 6840-01-562-5707. Verify interchangeability with system specifications before substitution.
Key specifications for 55-50-284: Maximum Running Torque: 6.00 INCH-OUNCES IN; Nonturn Device Location: AT 3 OCLOCK; Body Diameter: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN; Screw Thread Quantity Per Inch: 32.0. 30 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.