The Delay Line, cataloged under National Stock Number 5999-00-660-9990, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Esc Control Electronics Llc Dba Control Electronics Division of Fil-Coil. Government technical data includes 25 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5999-00-660-9990 |
| Primary Part Number | 4D501 |
| Item Name | Delay Line |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Esc Control Electronics Llc Dba Control Electronics Division of Fil-Coil |
| Status | ACTIVE |
| Pulse Rise Time Rating | 150.0 NANOSECONDS150.0 NANOSECONDS NS |
| Signal Delay Method | INDUCTANCEINDUCTANCE |
| FSC Application Data | RADAR NONAIRBORNE EXCEPT FIRE CONTROL AND GUIDED MISSILERADAR NONAIRBORNE EXCEPT FIRE CONTROL AND GUIDED MISSILE |
| Section Delay Time | 5.000 MICROSECONDS NOMINAL SINGLE SECTION5.000 MICROSECONDS NOMINAL SINGLE SECTION US |
| Mounting Facility Quantity | 44 |
| Output Impedance Rating | 1.000 KILOHMS1.000 KILOHMS |
| Body Style | RECTANGULARRECTANGULAR |
| Body Width | 3.750 INCHES NOMINAL3.750 INCHES NOMINAL IN |
| Mounting Provision Arrangement Style | FOUR POSITION RECTANGULARFOUR POSITION RECTANGULAR |
| Longest Vertical Distance Between Mounting Centers | 1.125 INCHES NOMINAL1.125 INCHES NOMINAL IN |
| Individual Section Quantity | 11 |
| Thread Pitch Diameters | +0.1875 TO 0.1876 INCHES+0.1875 TO 0.1876 INCHES IN |
| Frequency Bandwidth | 480.0 KILOHERTZ NOMINAL480.0 KILOHERTZ NOMINAL |
| Stud Length | 0.470 INCHES NOMINAL0.470 INCHES NOMINAL IN |
| Body Length | 1.880 INCHES NOMINAL1.880 INCHES NOMINAL IN |
| Input Impedance Rating | 1.000 KILOHMS1.000 KILOHMS |
| Mounting Facility | THREADED STUD(S)THREADED STUD(S) |
| Terminal Type and Quantity | 3 WIRE HOOK3 WIRE HOOK |
| Attenuation in Decibels | 3.0003.000 |
| Operating Temp Range | -55.0 TO 125.0 CELSIUS-55.0 TO 125.0 CELSIUS DEGC |
| Thread Class | 2A2A |
| Material | STEEL CASESTEEL CASE |
| Body Depth | 1.630 INCHES NOMINAL1.630 INCHES NOMINAL IN |
| Thread Size and Series/type Designator | 0.138-32 UNIFIED NATIONAL COARSE (UNC)0.138-32 UNIFIED NATIONAL COARSE (UNC) |
| Longest Horizontal Distance Between Mounting Centers | 1.375 INCHES NOMINAL1.375 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 5999-00-660-9990 is a Delay Line, manufactured by Esc Control Electronics Llc Dba Control Electronics Division of Fil-Coil, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-00-660-9990 has 2 manufacturer part numbers on file: 4D501 (Esc Control Electronics Llc Dba Control Electronics Division of Fil-Coil), 7712026P1 (Lockheed Martin Corporation Div Rms).
Key specifications for 4D501: Pulse Rise Time Rating: 150.0 NANOSECONDS150.0 NANOSECONDS NS; Signal Delay Method: INDUCTANCEINDUCTANCE; FSC Application Data: RADAR NONAIRBORNE EXCEPT FIRE CONTROL AND GUIDED MISSILERADAR NONAIRBORNE EXCEPT FIRE CONTROL AND GUIDED MISSILE; Section Delay Time: 5.000 MICROSECONDS NOMINAL SINGLE SECTION5.000 MICROSECONDS NOMINAL SINGLE SECTION US. 25 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 5999-00-660-9990 has DEMIL Code D. 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.