333131 — Mining Machinery and Equipment Manufacturing
Description
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 (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 3532 - Mining Machinery and Equipment, Except Oil and Gas Field Machinery and Equipment (via SIC1987:3532→NAICS1997:333131→2002:333131→2007:333131→2012:333131→2017:333131→2022:333131)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 3820 — Mining, Rock Drilling, Earth Boring, and Related Equipment
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 333131 valid in 2022? ▾
Yes, 333131 is a valid 6-digit 2022 NAICS national industry code representing 'Mining Machinery and Equipment Manufacturing' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 333131? ▾
The Small Business Administration (SBA) has established a small business size standard of 900 employees for NAICS code 333131 (Mining Machinery and Equipment Manufacturing), calculated based on employees.
What is the legacy SIC equivalent for NAICS 333131? ▾
According to official Census Bureau concordance tables, NAICS code 333131 (Mining Machinery and Equipment Manufacturing) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 3532 - Mining Machinery and Equipment, Except Oil and Gas Field Machinery and Equipment.
Related Pages & Tools
Further regulatory reference links for NAICS code 333131:
- Sector 31-33 Directory Hub — List of related industries in the Manufacturing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 333131 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Mining Machinery and Equipment Manufacturing).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.