NAICS 811310: Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance — Federal Contracts

What NAICS 811310 covers

The North American Industry Classification System (NAICS) is the standard the federal government uses to classify the industry of every contractor and every procurement. NAICS 811310 identifies businesses primarily engaged in commercial and industrial machinery and equipment (except automotive and electronic) repair and maintenance. When a contracting officer publishes a solicitation on SAM.gov, they tag it with the NAICS code that best matches the work — which is why getting your NAICS portfolio right inside SAM is the single most important step for showing up in agency searches.

Who buys NAICS 811310?

The federal agencies awarding the most contract value to vendors in this NAICS, based on 18 contractors tracked in the Mindy contractor database:

1. 1Dept Of The Army
2. 2Dept Of The Navy
3. 3Defense Logistics Agency
4. 4Department Of
5. 5Bureau Of Engraving And Printing

Source: aggregated from the Mindy contractor database (prime contractor disclosures via SBA + agency directories).

Top contractors in NAICS 811310

The largest prime contractors associated with NAICS 811310, ranked by total reported federal contract value. These are your most likely incumbents — and your most likely teaming partners on recompetes:

1. 1
   Huntington Ingalls Industries INC.

   $2.9B total reported value
2. 2
   KBR Services LLC

   $275.1M total reported value
3. 3
   Rapiscan Systems INC

   $155.7M total reported value
4. 4
   Cummins INC.

   $131.7M total reported value
5. 5
   Cooper Machinery Services LLC

   $51.4M total reported value
6. 6
   Atec INC.

   $48.3M total reported value
7. 7
   Phillips Corporation

   $14.5M total reported value
8. 8
   Energy Systems Group LLC

   $14.1M total reported value

Values reflect each contractor's aggregate reported federal contract value (across all of their NAICS codes, not just 811310). Use as a ranking signal, not as a per-NAICS award total.