# NSN 1560-00-633-4641: Duct Assembly, Ram Air

NSN 1560-00-633-4641 (also written 1560006334641; NIIN 00-633-4641) is a duct assembly, ram air in Federal Supply Class 1560, Airframe Structural Components. 2 manufacturer part numbers from 2 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 1560-00-633-4641 (1560006334641)
- NIIN: 00-633-4641 (006334641)
- Item name: DUCT ASSEMBLY,RAM AIR
- Federal Supply Class: [FSC 1560 Airframe Structural Components](https://nsnexplorer.com/fsc/1560/)
- Federal Supply Group: [FSG 15](https://nsnexplorer.com/group/15/)
- Acquisition method suffix code: AMSC C: needs engineering source approval; other sources must qualify first. (observed 2026-10-27)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AGAV | END ITEM IDENTIFICATION | AIRCRAFT MODEL B52 |
| TEXT | GENERAL CHARACTERISTICS ITEM DESCRIPTION | 7.700 IN. O/A LG,7.700 IN. O/A W,4.030 IN. MIN,4.060 IN. MAX EXTENDED H,3.750 IN. COMPRESSED H,16 MTG HOLES ON EACH FLANGE END 0.218 IN. MIN,0.228 IN. MAX DIA |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 10-30051 | 81205 | THE BOEING COMPANY DIV DEFENSE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 4718 | 99135 | FLEXCO, INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-04 | [SPE4A726V2291](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=1560006334641) | DUCT ASSEMBLY, RAM A | TRANSAERO, INC. | $14,206.63 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=1560006334641&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=1560006334641
- AMSC record: https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/
- USAspending contract actions (each award above links to its record)
- All data is public U.S. government data; every row above links to its source record where one exists.

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