The Coupler,directional, cataloged under National Stock Number 5985-01-150-4451, 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 Marc Alan Group the, Inc. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-150-4451 |
| Primary Part Number | 4251-20SMA |
| Item Name | Coupler,directional |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Marc Alan Group the, Inc |
| Status | ACTIVE |
| Terminal Fitting Controlling Agency | NORSAL INDUSTRIES INC |
| Usage Design | MAIN LINE AND SECONDARY LINE TERMINAL FITTING |
| Power Loss in Decibels | 0.3 |
| Identifying Number | TERMINAL FITTING MIL-C-39012 |
| Design Type | BIDIRECTIONAL |
| Radio Frequency Rating | 1.0 GIGAHERTZ MINIMUM AND 18.0 GIGAHERTZ MAXIMUM |
| Unit Type | COAXIAL LINE AND WAVEGUIDE |
| 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 |
|---|---|
| 4251-20SMA PRIMARY | Marc Alan Group the, Inc (USA) |
NSN 5985-01-150-4451 is a Coupler,directional, manufactured by Marc Alan Group the, Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-150-4451 has 1 manufacturer part number on file: 4251-20SMA (Marc Alan Group the, Inc).
Key specifications for 4251-20SMA: Overall Height: 0.688 INCHES NOMINAL IN; Terminal Fitting Controlling Agency: NORSAL INDUSTRIES INC; Usage Design: MAIN LINE AND SECONDARY LINE TERMINAL FITTING; Power Loss in Decibels: 0.3. 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.
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.