The Resistor,variable,wire Wound,pre, cataloged under National Stock Number 5905-00-903-0624, is classified within Federal Supply Class 5905 (Resistor) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 29 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5905-00-903-0624 |
| Primary Part Number | 1856939 |
| Item Name | Resistor,variable,wire Wound,pre |
| FSC / FSG | 5905 / 59 — Resistor |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Body Diameter | 1.750 INCHES NOMINAL IN |
| Lateral Runout | 0.002 INCHES IN |
| Electrical Resistance Per Section | 10.0 KILOHMS SINGLE SECTION |
| Mounting Lip Depth | 0.0880 INCHES MINIMUM AND 0.0980 INCHES MAXIMUM IN |
| Ambient Temp in Deg Celsius Per Section at Zero Percent Rated Power | 125.0 SINGLE SECTION |
| Undercut Width | 0.0730 INCHES MINIMUM IN |
| Section Quantity | 1 |
| Shaft Diameter | 0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Undercut Diameter | 1.625 INCHES MAXIMUM IN |
| Function Characteristic Per Section | SINGLE SECTION LINEAR |
| Body Style | CYLINDRICAL SERVO MOUNTED |
| Function Conformity Tolerance Per Section | -7.50 TO 7.50 SINGLE SECTION |
| Shaft End Play | 0.005 INCHES IN |
| Overall Diameter | 1.938 INCHES NOMINAL IN |
| Mounting Method | CLAMP RING(S) |
| Maximum Starting Torque | 0.50 INCH-OUNCES IN |
| Temp Coefficient of Resistance Wire Per Section in Ppm Per Deg Celsius | -20.0 TO 20.0 SINGLE SECTION |
| Terminal Location | UPPER ADJACENT SIDE TWO ROWS LOCATION NOT OTHERWISE SPECIFIED |
| Mounting Lip Diameter | 1.7450 INCHES MINIMUM AND 1.7800 INCHES MAXIMUM IN |
| Features Provided | NONMETALLIC SHAFT |
| Shaft Style | ROUND |
| Actuator Type | SINGLE SHAFT |
| Shaft Length | 0.662 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Pilot Diameter | 1.5610 INCHES MINIMUM AND 1.5620 INCHES MAXIMUM IN |
| Body Length | 1.250 INCHES NOMINAL IN |
| Shaft Runout | 0.001 INCHES IN |
| Pilot Length | 0.0570 INCHES MINIMUM AND 0.0670 INCHES MAXIMUM IN |
| Power Dissipation Rating Per Section in Watts | 3.0 FREE AIR SINGLE SECTION |
| Effective Electrical Rotation in Deg Angular Rotation | 360.0 NOMINAL |
| 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 |
|---|---|
| 28W1-2152 | Servo Instrument Corporation (USA) |
| AP18C71 | Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments (USA) |
| 1856939 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| ST18S113C | Sensor Systems, L.l.c. Dba Sensor Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| ST18S113C | 5/9 Secondary reference U.S. Government activity |
| AP18C71 | 5/9 Secondary reference Ace Electronics Associates Inc |
| 1002326 | 5/9 Secondary reference Lockheed Martin Corporation Div Rms - Mitchel Field |
NSN 5905-00-903-0624 is a Resistor,variable,wire Wound,pre, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5905, Resistor. Status: active.
NSN 5905-00-903-0624 has 4 manufacturer part numbers on file: 28W1-2152 (Servo Instrument Corporation), AP18C71 (Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments), 1856939 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), ST18S113C (Sensor Systems, L.l.c. Dba Sensor Systems Llc).
1 possible match (shared part number, not a government interchangeability claim): 2910-01-619-9519. Verify interchangeability with system specifications before substitution.
Key specifications for 1856939: Body Diameter: 1.750 INCHES NOMINAL IN; Lateral Runout: 0.002 INCHES IN; Electrical Resistance Per Section: 10.0 KILOHMS SINGLE SECTION; Mounting Lip Depth: 0.0880 INCHES MINIMUM AND 0.0980 INCHES MAXIMUM IN. 29 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.