The Cap,filler Opening, cataloged under National Stock Number 2590-01-161-2680, is classified within Federal Supply Class 2590 (Miscellaneous Vehicular Components) of the Vehicular Equipment Components group. The manufacturer of record is Oshkosh Defense Llc. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2590-01-161-2680 |
| Primary Part Number | 2BF658 |
| Item Name | Cap,filler Opening |
| FSC / FSG | 2590 / 25 — Miscellaneous Vehicular Components |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Accommodation Type | PLAIN END GRIPPING |
| Thread Length | 0.688 INCHES NOMINAL IN |
| Retaining Device Type | CHAIN |
| Style Designator | VENTED THREADED TYPE (INTERNAL) |
| Thread Diameter | 4.000 INCHES NOMINAL IN |
| Outside Diameter | 5.250 INCHES NOMINAL IN |
| Features Provided | FUSIBLE SAFETY PLUG |
| System for Which Designed | PRESSURIZED |
| Pressure Relief Method | AUTOMATIC |
| Color | YELLOW |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2BF658 | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| B5597-2 | 3/9 Design control — primary reference Cutler Metal Products Co |
| 2BF658 | 5/9 Secondary reference Oshkosh Corp |
NSN 2590-01-161-2680 is a Cap,filler Opening, manufactured by Oshkosh Defense Llc, classified under FSC 2590, Miscellaneous Vehicular Components. Status: active.
NSN 2590-01-161-2680 has 1 manufacturer part number on file: 2BF658 (Oshkosh Defense Llc).
Key specifications for 2BF658: Overall Height: 1.188 INCHES NOMINAL IN; Accommodation Type: PLAIN END GRIPPING; Thread Length: 0.688 INCHES NOMINAL IN; Retaining Device Type: CHAIN. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.