The Spark Gap, cataloged under National Stock Number 5985-01-137-4177, is classified within Federal Supply Class 5985 (Antennas, Waveguides, and Related Equipment) of the Electrical and Electronic Equipment Components group. The manufacturer of record is High Energy Devices, Llc. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-137-4177 |
| Primary Part Number | TG249 |
| Item Name | Spark Gap |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | High Energy Devices, Llc |
| Status | ACTIVE |
| FSC Application Data | SURVEILLANCE RADAR INSTALLATION |
| Overall Diameter | 0.620 INCHES MAXIMUM IN |
| Gap Type | NONROTARY |
| Direct Current Voltage Rating in Volts | 180.0 |
| Precious Material and Location | EXPOSED METAL SURFACES SILVER |
| Usage Design | MARITIME SURVEILLANCE RADAR |
| Installation Design | AIRBORNE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| TG249 | High Energy Devices, Llc (USA) |
| Reference | Meaning |
|---|---|
| 580R697H01 | 3/2 Design control — primary reference U.S. Government activity |
| 580R697 | D/9 Drawing number reference only U.S. Government activity |
NSN 5985-01-137-4177 is a Spark Gap, manufactured by High Energy Devices, Llc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-137-4177 has 1 manufacturer part number on file: TG249 (High Energy Devices, Llc).
Key specifications for TG249: FSC Application Data: SURVEILLANCE RADAR INSTALLATION; Overall Diameter: 0.620 INCHES MAXIMUM IN; Gap Type: NONROTARY; Overall Length: 0.948 INCHES NOMINAL IN. 7 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.
NSN 5985-01-137-4177 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.