The Resistor,thermal, cataloged under National Stock Number 5905-00-656-9992, is classified within Federal Supply Class 5905 (Resistor) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Measurement Specialties, Inc.. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5905-00-656-9992 |
| Primary Part Number | 51A31 |
| Item Name | Resistor,thermal |
| FSC / FSG | 5905 / 59 — Resistor |
| Manufacturer | Measurement Specialties, Inc. |
| Status | ACTIVE |
| Temp Points for Resistance Readings at Zero Power | -37.8 CELSIUS FIRST RESISTANCE-TEMPERATURE POINT DEGC |
| Inclosure Type | HERMETICALLY SEALED |
| Terminal Diameter | 0.012 INCHES NOMINAL IN |
| Resistance Tolerance at a Specified Temp in Percent | -10.0 TO 10.0 ALL RESISTANCE-TEMPERATURE POINTS |
| Terminal Length | 2.000 INCHES NOMINAL IN |
| Zero Power Resistance at Specified Temp | 67.5 OHMS FIRST RESISTANCE-TEMPERATURE POINT |
| Body Outside Diameter | 0.100 INCHES NOMINAL IN |
| Reference Temp in Deg Celsius | 25.0 |
| Style Designator | BEAD TYPE EVACUATED OR GAS FILLED ENVELOPE |
| Power Dissipation Constant in Milliwatts Per Deg Celsius | 8.0 |
| Zero Power Resistance | 100.000 KILOHMS |
| Thermal Time Constant in Seconds | 60.0 |
| Ambient Temp at Full Rated Power | 25.0 CELSIUS DEGC |
| Zero Power Resistance Tolerance in Percent at Reference Temp | -15.0 TO 15.0 |
| Maximum Operating Temp | 150.0 CELSIUS DEGC |
| Body Length | 1.062 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Terminal Type and Quantity | 2 WIRE LEAD |
| Maximum Power Dissipation Rating | 1.00 MILLIWATTS |
| 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 |
|---|---|
| 51A31 | Measurement Specialties, Inc. (USA) |
| 51PA17 | Saft America Inc. Dba Tadiran Batteries Div Aviation Division (USA) |
| Reference | Meaning |
|---|---|
| C5-15-4388 | 3/2 Design control — primary reference U.S. Government activity |
| 51A31 | 5/9 Secondary reference U.S. Government activity |
NSN 5905-00-656-9992 is a Resistor,thermal, manufactured by Measurement Specialties, Inc., classified under FSC 5905, Resistor. Status: active.
NSN 5905-00-656-9992 has 2 manufacturer part numbers on file: 51A31 (Measurement Specialties, Inc.), 51PA17 (Saft America Inc. Dba Tadiran Batteries Div Aviation Division).
1 possible match (shared part number, not a government interchangeability claim): 5945-01-264-1754. Verify interchangeability with system specifications before substitution.
Key specifications for 51A31: Temp Points for Resistance Readings at Zero Power: -37.8 CELSIUS FIRST RESISTANCE-TEMPERATURE POINT DEGC; Inclosure Type: HERMETICALLY SEALED; Terminal Diameter: 0.012 INCHES NOMINAL IN; Resistance Tolerance at a Specified Temp in Percent: -10.0 TO 10.0 ALL RESISTANCE-TEMPERATURE POINTS. 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.