The Waveguide Assembly, cataloged under National Stock Number 5985-01-255-9557, 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 Frontgrade Technologies Inc.. Government technical data includes 9 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-255-9557 |
| Primary Part Number | 3257647 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Frontgrade Technologies Inc. |
| Status | ACTIVE |
| Flange Inside Height | 0.670 INCHES NOMINAL ALL FLANGES IN |
| Flange Quantity | 2 |
| Voltage Standing Wave Ratio | 1.16 |
| Flange Outside Height | 2.330 INCHES NOMINAL ALL FLANGES IN |
| Flange Connecting Hole Diameter | 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM ALL FLANGES ALL CONNECTION FACILITIES IN |
| Flange Inside Width | 2.840 INCHES NOMINAL ALL FLANGES IN |
| Flange Outside Width | 3.750 INCHES NOMINAL ALL FLANGES IN |
| Flange Connecting Facility and Quantity | 8 UNTHREADED HOLE(S) ALL FLANGES ALL CONNECTION FACILITIES |
| Flange Style | CONTACT TYPE ALL FLANGES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 3257647 | Frontgrade Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| 122401 | 5/9 Secondary reference U.S. Government activity |
| 52636 | 3/9 Design control — primary reference U.S. Government activity |
| 122401 | C/1 Advisory reference — outside the item-of-supply concept Frontgrade Technologies Inc. |
| 3257647 | 7/2 Vendor item drawing reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 5985-01-255-9557 is a Waveguide Assembly, manufactured by Frontgrade Technologies Inc., classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-255-9557 has 1 manufacturer part number on file: 3257647 (Frontgrade Technologies Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 6625-01-449-6731, 7510-01-657-9989. Verify interchangeability with system specifications before substitution.
Key specifications for 3257647: Flange Inside Height: 0.670 INCHES NOMINAL ALL FLANGES IN; Flange Quantity: 2; Voltage Standing Wave Ratio: 1.16; Flange Outside Height: 2.330 INCHES NOMINAL ALL FLANGES IN. 9 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 5985-01-255-9557 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.