333131 Mining Machinery and Equipment Manufacturing

Official definition

This U.S. industry comprises establishments primarily engaged in (1) manufacturing underground mining machinery and equipment, such as coal breakers, mining cars, core drills, coal cutters, and rock drills, and (2) manufacturing mineral beneficiating machinery and equipment used in surface or underground mines.

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

• Manufacturing surface mining machinery and equipment are classified in Industry 333120, Construction Machinery Manufacturing.
• Manufacturing well drilling machinery are classified in U.S. Industry 333132, Oil and Gas Field Machinery and Equipment Manufacturing.
• Manufacturing coal and ore conveyors are classified in U.S. Industry 333922, Conveyor and Conveying Equipment Manufacturing.
• Manufacturing underground mining locomotives are classified in Industry 336510, Railroad Rolling Stock Manufacturing.

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 333131

The Census index assigns these 33 activities to this code. If your business matches one, this is your code.

• Amalgamators (i.e., metallurgical and mining machinery) manufacturing
• Augers, mining-type, manufacturing
• Bits, rock drill, underground mining-type, manufacturing
• Breakers, coal, manufacturing
• Cars, mining, manufacturing
• Cleaning machinery, mining-type, manufacturing
• Coal breakers, cutters, and pulverizers manufacturing
• Concentration machinery, mining-type, manufacturing
• Core drills, underground mining-type, manufacturing
• Crushing machinery, stationary, manufacturing
• Cutters, coal, manufacturing
• Drilling equipment, underground mining-type, manufacturing
• Drills, core, underground mining-type, manufacturing
• Drills, rock, underground mining-type, manufacturing
• Dumpers, mining car, manufacturing
• Feeders, mineral beneficiating-type, manufacturing
• Flotation machinery, mining-type, manufacturing
• Hammer mill machinery (i.e., rock and ore crushing machines), stationary, manufacturing
• Loading machines, underground mining, manufacturing
• Mineral processing and beneficiating machinery manufacturing
• Mining cars manufacturing
• Ore crushing, washing, screening, and loading machinery manufacturing
• Pellet mills machinery, mining-type, manufacturing
• Quarrying machinery and equipment manufacturing
• Rock crushing machinery, stationary, manufacturing
• Rock drills, underground mining-type, manufacturing
• Scraper loaders, underground mining-type, manufacturing
• Screening machinery, stationary, manufacturing
• Sedimentary mineral machinery manufacturing
• Sieves and screening equipment, mineral beneficiating, manufacturing
• Stone beneficiating machinery manufacturing
• Underground mining machinery manufacturing
• Washers, aggregate and sand, stationary, manufacturing

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 333131

To count as a small business for SBA loans and federal contracts under NAICS 333131, your business (including affiliates) must not exceed 900 employees. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2593, 2816, 2818, 2824, 3020), so treat them as a starting point and check the definition.

• 25930Manufacture of wire products, chain and springsUK SIC
• 28240Manufacture of power-driven hand toolsUK SIC
• 30200Manufacture of railway locomotives and rolling stockUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

• 333132Oil and Gas Field Machinery and Equipment Manufacturing