NAICS Code 811310 — Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 81131 (Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance).

Code	811310
Title	Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	$12.5 million in average annual receipts

Official definition (2022 NAICS)

This industry comprises establishments primarily engaged in the repair and maintenance of commercial and industrial machinery and equipment. Establishments in this industry either sharpen/install commercial and industrial machinery blades and saws or provide welding (e.g., automotive, general) repair services; or repair agricultural and other heavy and industrial machinery and equipment (e.g., forklifts and other material handling equipment, machine tools, commercial refrigeration equipment, construction equipment, and mining machinery).

Is a business under 811310 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 811310 qualifies as a small business if it does not exceed $12.5 million in average annual receipts. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — receipts are averaged over the latest 5 fiscal years.

Where 811310 sits in the hierarchy

Level	Code	Title
Sector	81	Other Services (except Public Administration)
Subsector	811	Repair and Maintenance
Industry Group	8113	Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
NAICS Industry	81131	Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
National Industry	811310	Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
7623	Refrigeration and Air-Conditioning Service and Repair Shops
7692	Welding Repair
7694	Armature Rewinding Shops
7699	Repair Shops and Related Services, Not Elsewhere Classified

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.