The Resistor,variable,nonwire Wound,, cataloged under National Stock Number 5905-00-159-7979, is classified within Federal Supply Class 5905 (Resistor) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Pyser Sgi Limited. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5905-00-159-7979 |
| Primary Part Number | 300631-503 |
| Item Name | Resistor,variable,nonwire Wound, |
| FSC / FSG | 5905 / 59 — Resistor |
| Manufacturer | Pyser Sgi Limited |
| Status | ACTIVE |
| Body Diameter | 1.156 INCHES MAXIMUM IN |
| Operating Position | START OF ROTATION |
| Screw Thread Quantity Per Inch | 32.0 |
| Electrical Resistance Per Section | 50.0 KILOHMS SINGLE SECTION |
| Switch Voltage Rating in Volts | 125.0 |
| Ambient Temp in Deg Celsius Per Section at Zero Percent Rated Power | 120.0 SINGLE SECTION |
| Section Quantity | 1 |
| Shaft Diameter | 0.250 INCHES MAXIMUM IN |
| Nonturn Device Radius | 0.531 INCHES NOMINAL IN |
| Body Style | CYLINDRICAL BUSHING MOUNTED |
| Overall Diameter | 1.453 INCHES NOMINAL IN |
| Mounting Method | STANDARD BUSHING |
| Terminal Location | REAR-BOTTOM |
| Features Provided | SWITCH |
| Shaft Style | ROUND |
| Actuator Type | SINGLE SHAFT |
| Shaft Length | 0.875 INCHES NOMINAL IN |
| Body Length | 0.625 INCHES MAXIMUM IN |
| Power Dissipation Rating Per Section in Watts | 2.25 HEAT SINK SINGLE SECTION |
| Switch Type | ROTARY |
| Effective Electrical Rotation in Deg Angular Rotation | 312.0 NOMINAL |
| Screw Thread Diameter | 0.375 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Screw Thread Series Designator | UNEF |
| Actuator Travel Control Feature | STOPS |
| Resistance Temp Characteristic Range Per Section in Percent | +0.0 TO 7.0 -55 DEG CELSIUS SINGLE SECTION AND +0.0 TO 3.5 -25 DEG CELSIUS SINGLE SECTION AND +0.0 TO 2.0 0 DEG CELSIUS SINGLE SECTION AND -2.5 TO 2.5 85 DEG CELSIUS SINGLE SECTION AND +0.0 TO 5.5 120 DEG CELSIUS SINGLE SECTION |
| Resistance Tolerance Per Section in Percent | -10.0 TO 10.0 SINGLE SECTION |
| Switch Contact Arrangement | SINGLE POLE, SINGLE THROW, NORMALLY OPEN, BOTH POSITIONS MAINTAINED |
| Terminal Type and Quantity | 5 TAB, SOLDER LUG |
| 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 |
|---|---|
| 300631-503 | Pyser Sgi Limited (GBR) |
| Reference | Meaning |
|---|---|
| 300631-503 | 3/9 Design control — primary reference Richards Imagery Interpretation Systems, L.l.c. |
NSN 5905-00-159-7979 is a Resistor,variable,nonwire Wound,, manufactured by Pyser Sgi Limited, classified under FSC 5905, Resistor. Status: active.
NSN 5905-00-159-7979 has 1 manufacturer part number on file: 300631-503 (Pyser Sgi Limited).
Key specifications for 300631-503: Body Diameter: 1.156 INCHES MAXIMUM IN; Operating Position: START OF ROTATION; Screw Thread Quantity Per Inch: 32.0; Electrical Resistance Per Section: 50.0 KILOHMS SINGLE SECTION. 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.