# NSN 9135-01-665-9551: Propellant Pressurizing Agent, He

NSN 9135-01-665-9551 (also written 9135016659551; NIIN 01-665-9551) is a propellant pressurizing agent, he in Federal Supply Class 9135, Liquid Propellant Fuels and Oxidizers, Chemical Base. 2 manufacturer part numbers from 1 supplier are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 9135-01-665-9551 (9135016659551)
- NIIN: 01-665-9551 (016659551)
- Item name: PROPELLANT PRESSURIZING AGENT,HE
- Federal Supply Class: [FSC 9135 Liquid Propellant Fuels and Oxidizers, Chemical Base](https://nsnexplorer.com/fsc/9135/)
- Federal Supply Group: [FSG 91](https://nsnexplorer.com/group/91/)
- Acquisition method suffix code: AMSC G: the government has a complete data package and the rights to use it. (observed 2026-10-15)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| BBRC | COMPOSITION AND PERCENTAGE | MINIMUM BY VOLUME HELIUM 99.997 |
| CLWW | CYLINDER NATIONAL STOCK NUMBER | 8120-01-354-1166 |
| CLWX | SUPPLIED CYLINDER | NONSUPPLY ITEM |
| FEAT | SPECIAL FEATURES | IMPURITIES MAX CONCENTRATION BY VOLUME - NEON 23 PPM; NITROGEN 5 PPM; OXYGEN 3 PPM; WATER VAPOR 8 PPM; HYDROGEN 1 PPM; HYDROCARBONS 1 PPM; WITH CGA-580 OUTLET; USED FOR UNDER WATER BREATHING; |
| SUPP | SUPPLEMENTARY FEATURES | FILLED CYLINDER NSN : 6830-01-354-1164 |
| ZZZT | NONDEFINITIVE SPEC/STD DATA | TYPE I AND GRADE B |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| M27407-1B | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| MIL-P-27407 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-23 | [SPE60126D1503/SPE60126FL23H](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=9135016659551) | PROPELLANT PRESSURIZING AGENT, HELIUM | — | $33,213.99 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=9135016659551&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=9135016659551
- 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.

Canonical page: https://nsnexplorer.com/nsn/9135-01-665-9551/
JSON: https://nsnexplorer.com/api/nsn/9135-01-665-9551.json