PSC H391: Inspection – Fuels, Lubricants, Oils, and Waxes
H391 is the product and service code (PSC) federal agencies use for “Inspection – Fuels, Lubricants, Oils, and Waxes”, in the “Inspection Services” group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 1
- Federal contract spending, FY2025
- $2.6 million
- Share of contract dollars to small businesses, since FY2024
- 76%
Open count as of Oct 28, 2026, 5:43 PM ET. The search counts live, so its total can differ by a notice or two.
Open PSC H391 contracts with 2+ days to respond
- Cleaning, Inspection, and Hazardous Waste Removal for Two 10,000-Gallon Oil/Water Separators
✦ Solicitation FA663327QA001 (the text also writes FA6633-27-Q-A001) is a request for quotation from the 934th Airlift Wing Contracting Office, set aside for small businesses.
Due in 15 daysNov 12, 2026, 12:00 PM CST
Where H391 sits in the PSC Manual
- Category: Service
- Group H: Quality Control, Test, Inspection
- Group H3: Inspection Services
- Code H391: Inspection – Fuels, Lubricants, Oils, and Waxes
NAICS codes used with PSC H391
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with H391 most often:
| NAICS | Industry | Spent, last 3 years | Open with PSC H391 |
|---|---|---|---|
| 541990 | All Other Professional, Scientific, and Technical Services | $4.9 million | 1 |
| 488490 | Other Support Activities for Road Transportation | $2.1 million | — |
| 424710 | Petroleum Bulk Stations and Terminals | $1.4 million | — |
| 541380 | Testing Laboratories and Services | $949,448 | — |
| 237120 | Oil and Gas Pipeline and Related Structures Construction | $819,268 | — |
| 457210 | Fuel Dealers | $562,761 | — |
Open contracts under each code, with any PSC: NAICS 541990 · NAICS 488490 · NAICS 424710 · NAICS 541380 · NAICS 237120 · NAICS 457210
Who buys under PSC H391
Agencies with the most contract dollars under H391 over the last three fiscal years, per USAspending.gov. Each name links to that agency's open contracts and buying history:
| Agency | Obligated |
|---|---|
| Department of the Army | $4.8 million |
| Department of State | $4.1 million |
| Department of Veterans Affairs | $2.1 million |
| Department of the Air Force | $726,357 |
| Indian Health Service | $56,624 |
| Department of the Navy | $30,792 |
| National Park Service | $29,628 |
| National Oceanic and Atmospheric Administration | $9,818 |
Federal spending under PSC H391 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $6.6 million |
| FY2025 | $2.6 million |
| FY2026 (incomplete) | $2.7 million |
Headline figures use FY2025, the last complete year. FY2026 is still incomplete and will rise until about early January 2027 as Defense data arrives: USAspending.gov publishes Defense contracts 90 days after they're signed.
Who wins PSC H391 contracts
| Company | Obligated, last 3 years |
|---|---|
| Interspec, LLC | $2.8 million |
| Cayuse Federal Services LLC | $1.4 million |
| Sonol Israel LTD. | $1 million |
| JBW Group LLC | $1 million |
| Sage, LLC | $786,951 |
| Paz Oil Company Limited | $783,843 |
| All Native Synergies Company | $670,541 |
| Arcadis Consulting (UK) Limited | $619,075 |
| Independence Constructors Inc | $530,981 |
| Mass Tank Inspection Services LLC | $345,749 |
Linked names have a FedReady profile, which shows the NAICS codes a business is registered as small under. Most large companies have none.
Large prime contractors (companies that hold the contract with the agency) subcontract part of their work to small businesses. See which primes subcontract, by NAICS code.
Research PSC H391 work
By the NAICS codes this work goes with, the one with the most spending first: who won recently, contracts ending soon, agencies' planned buys and the large primes that subcontract it, nationwide. Each code shows only the pages that exist for it:
- 541990 All Other Professional, Scientific, and Technical Services: who won recently · contracts ending in the next 12 months · planned buys · large primes that subcontract
- 488490 Other Support Activities for Road Transportation: who won recently · planned buys
- 424710 Petroleum Bulk Stations and Terminals: large primes that subcontract
Related PSC codes
- H310 Inspection – Weapons
- H311 Inspection – Nuclear Ordnance
- H312 Inspection – Fire Control Equipment
- H313 Inspection – Ammunition and Explosives
- H314 Inspection – Guided Missiles
- H315 Inspection – Aircraft and Airframe Structural Components
- H316 Inspection – Aircraft Components and Accessories
- H317 Inspection – Aircraft Launching, Landing, and Ground Handling Equipment
- H318 Inspection – Space Vehicles
- H319 Inspection – Ships, Small Craft, Pontoons, and Floating Docks
Frequently asked questions
What is PSC H391?
H391 is the service code in the federal Product and Service Code (PSC) Manual named “Inspection – Fuels, Lubricants, Oils, and Waxes”, under H (Quality Control, Test, Inspection) and H3 (Inspection Services). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC H391?
Most federal contract dollars under PSC H391 go with NAICS 541990 (All Other Professional, Scientific, and Technical Services), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC H391?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 1 open notice uses PSC H391 right now. FedReady can match new ones to your business and email you, free.
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Sources: SAM.gov Contract Opportunities, USAspending.gov and the PSC Manual. How we count.