324121 — Asphalt Paving Mixture and Block Manufacturing
Description
This U.S. industry comprises establishments primarily engaged in manufacturing asphalt and tar paving mixtures and blocks from purchased asphaltic materials (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Establishments primarily engaged in refining crude petroleum and manufacturing asphalt and tar paving mixtures
- and blocks are classified in Industry 324110, Petroleum Refineries.
- MANUFACTURING 189
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 2951 - Asphalt Paving Mixtures and Blocks (via SIC1987:2951→NAICS1997:324121→2002:324121→2007:324121→2012:324121→2017:324121→2022:324121)
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 3630 — Clay and Concrete Products Industries Machinery
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 324121 valid in 2022? ▾
Yes, 324121 is a valid 6-digit 2022 NAICS national industry code representing 'Asphalt Paving Mixture and Block Manufacturing' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 324121? ▾
The Small Business Administration (SBA) has established a small business size standard of 500 employees for NAICS code 324121 (Asphalt Paving Mixture and Block Manufacturing), calculated based on employees.
What is the legacy SIC equivalent for NAICS 324121? ▾
According to official Census Bureau concordance tables, NAICS code 324121 (Asphalt Paving Mixture and Block Manufacturing) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 2951 - Asphalt Paving Mixtures and Blocks.
Related Pages & Tools
Further regulatory reference links for NAICS code 324121:
- 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 324121 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Asphalt Paving Mixture and Block 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.