The Resistor,variable,wire Wound,pre, cataloged under National Stock Number 5905-00-643-9420, 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5905-00-643-9420 |
| Primary Part Number | HP300 |
| 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 | 1.20 INCH-OUNCES IN |
| Nonturn Device Location | AT 9 OCLOCK |
| Body Diameter | 3.000 INCHES NOMINAL IN |
| Screw Thread Quantity Per Inch | 32.0 |
| Lateral Runout | 0.010 INCHES IN |
| Electrical Resistance Per Section | 20.000 KILOHMS SINGLE SECTION |
| Ambient Temp in Deg Celsius Per Section at Zero Percent Rated Power | 85.0 SINGLE SECTION |
| Section Quantity | 1 |
| Shaft Diameter | 0.250 INCHES NOMINAL IN |
| Nonturn Device Radius | 0.531 INCHES NOMINAL IN |
| Function Characteristic Per Section | SINGLE SECTION LINEAR |
| Body Style | CYLINDRICAL BUSHING MOUNTED |
| Function Conformity Tolerance Per Section | -0.10 TO 0.10 SINGLE SECTION |
| Shaft End Play | 0.00500 INCHES IN |
| Overall Diameter | 3.250 INCHES NOMINAL IN |
| Terminal Length | 0.250 INCHES NOMINAL IN |
| Tap Location From Ccw Terminal Per Section in Ohms | 670.0 SINGLE SECTION |
| Mounting Method | STANDARD BUSHING |
| Maximum Starting Torque | 1.50 INCH-OUNCES IN |
| Temp Coefficient of Resistance Wire Per Section in Ppm Per Deg Celsius | -0.0 TO 130.0 SINGLE SECTION |
| Fixed Tap Quantity Per Section | 1 SINGLE SECTION |
| Terminal Location | RADIALLY POSITIONED OVER LESS THAN HALF THE CIRCUMFERENCE LOCATION NOT OTHERWISE SPECIFIED |
| Features Provided | NONMETALLIC SHAFT |
| Shaft Style | ROUND |
| Actuator Type | SINGLE SHAFT |
| Shaft Length | 1.469 INCHES MINIMUM AND 1.531 INCHES MAXIMUM IN |
| Body Length | 0.962 INCHES MINIMUM AND 1.002 INCHES MAXIMUM IN |
| Shaft Runout | 0.001 INCHES IN |
| Power Dissipation Rating Per Section in Watts | 5.0 FREE AIR SINGLE SECTION |
| 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 |
|---|---|
| HP300 | Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments (USA) |
| Reference | Meaning |
|---|---|
| C745424-2 | 3/9 Design control — primary reference Rca Corp Distributor and Special Products Div |
NSN 5905-00-643-9420 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 5905-00-643-9420 has 1 manufacturer part number on file: HP300 (Samarius Precision Instruments, Inc. Dba Samarius Precision Instruments).
2 possible matches (shared part number, not a government interchangeability claim): 5120-01-479-5747, 5120-01-504-2225. Verify interchangeability with system specifications before substitution.
Key specifications for HP300: Maximum Running Torque: 1.20 INCH-OUNCES IN; Nonturn Device Location: AT 9 OCLOCK; Body Diameter: 3.000 INCHES NOMINAL IN; Screw Thread Quantity Per Inch: 32.0. 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.