The Headset-Microphone, cataloged under National Stock Number 5965-00-421-6440, is classified within Federal Supply Class 5965 (Headsets, Handsets, Microphones and Speakers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Orbital Corporation of Tampa Dba Orbital Corp. Government technical data includes 15 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5965-00-421-6440 |
| Primary Part Number | JTHM-57 492 |
| Item Name | Headset-Microphone |
| FSC / FSG | 5965 / 59 — Headsets, Handsets, Microphones and Speakers |
| Manufacturer | Orbital Corporation of Tampa Dba Orbital Corp |
| Status | ACTIVE |
| Microphone Element Type | CARBON |
| Operating Current Rating | 60.0 MILLIAMPERES NOMINAL |
| Mounting Method | SUSPENDED ON HEADBAND EARPHONE |
| Microphone Mounting Facility | ADAPTER FASTENED TO RIGHT SIDE OF HEADBAND |
| Earphone Identifying Number | 110970-53 PART NO. |
| Earphone Quantity | 2 |
| Connector Identifying Number | PJ-051R/5935-837-5969/ TYPE NO. |
| Connector to Junction Cord Length | 8.000 FEET FT |
| Impedance Rating | 30.0 OHMS NOMINAL |
| Connector Controlling Agency | MIL |
| Earphone Element Type | MAGNETIC |
| Frequency Rating | 0.2 KILOHERTZ MINIMUM AND 4000.0 KILOHERTZ MAXIMUM |
| Connector Name | PLUG |
| Earphone Controlling Agency | ROANWELL CORP |
| Earphone Impedance Rating | 300.0 OHMS NOMINAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| JTHM-57 492 | Orbital Corporation of Tampa Dba Orbital Corp (USA) |
| Reference | Meaning |
|---|---|
| 492-149-001-694 | 3/2 Design control — primary reference U.S. Government activity |
| 109130 | 5/9 Secondary reference U.S. Government activity |
| 113860-690 | 5/9 Secondary reference U.S. Government activity |
| JTHM-57 492 | 5/9 Secondary reference Joyce Telectronics Corp |
| 492-149-001-690 | 5/9 Secondary reference U.S. Government activity |
NSN 5965-00-421-6440 is a Headset-Microphone, manufactured by Orbital Corporation of Tampa Dba Orbital Corp, classified under FSC 5965, Headsets, Handsets, Microphones and Speakers. Status: active.
NSN 5965-00-421-6440 has 1 manufacturer part number on file: JTHM-57 492 (Orbital Corporation of Tampa Dba Orbital Corp).
1 possible match (shared part number, not a government interchangeability claim): 5895-01-435-0877. Verify interchangeability with system specifications before substitution.
Key specifications for JTHM-57 492: Microphone Element Type: CARBON; Operating Current Rating: 60.0 MILLIAMPERES NOMINAL; Mounting Method: SUSPENDED ON HEADBAND EARPHONE; Microphone Mounting Facility: ADAPTER FASTENED TO RIGHT SIDE OF HEADBAND. 15 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.