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.
Overview Facts
| NAICS Code | 333131 |
|---|---|
| Industry Title | Mining Machinery and Equipment Manufacturing |
| SBA Size Standard | 900 employees |
| U.S. Establishments | 266 (Census CBP, 2023) |
| IRS PBA Code | 333100 (rolled-up match) |
| Sectors Hierarchy | Sector 31-33 → 333 → 3331 |
| Source / Verified | US Census 2022 NAICS Manual, Census CBP / 2026-06-28 |
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)
Related Resources & Compliance Guides
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.
- 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.
Related Industries in 3331
Frequently Asked Questions (FAQ)
Is 333131 a valid 2022 NAICS code?
NAICS 333131 is 'Mining Machinery and Equipment Manufacturing', a 2022 U.S. national industry under Sector 31-33 (Manufacturing); the SBA small-business size standard is 900 employees.
What is the SBA size standard for NAICS 333131?
The SBA small business size standard for NAICS 333131 is 900 employees (based on employees).
What is the legacy SIC code mapping for 333131?
NAICS code 333131 maps to the legacy 1987 SIC codes: 3532 - Mining Machinery and Equipment, Except Oil and Gas Field Machinery and Equipment.