2022 NAICS national industry in sector 31-33 Manufacturing
327120 Clay Building Material and Refractories Manufacturing
NAICS 327120 is the US industry code for clay building material and refractories manufacturing. It covers establishments primarily engaged in shaping, molding, baking, burning, or hardening clay refractories, nonclay refractories, ceramic tile, structural clay tile, brick, and other structural clay building materials.
- Code
- 327120 (2022 NAICS)
- Title
- Clay Building Material and Refractories Manufacturing
- Part of
- Clay Product and Refractory Manufacturing
- SBA small business limit
- Up to 750 employees
- Closest UK SIC
- 23910 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This industry comprises establishments primarily engaged in shaping, molding, baking, burning, or hardening clay refractories, nonclay refractories, ceramic tile, structural clay tile, brick, and other structural clay building materials. A refractory is a material that will retain its shape and chemical identity when subjected to high temperatures and is used in applications that require extreme resistance to heat, such as furnace linings.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Manufacturing resilient flooring and asphalt floor tiles are classified in U.S. Industry 326199, All Other Plastics Product Manufacturing.
- Manufacturing concrete bricks are classified in U.S. Industry 327331, Concrete Block and Brick Manufacturing.
- Manufacturing glass bricks and blocks are classified in Industry 32721, Glass and Glass Product Manufacturing.
Activities listed under 327120
The Census index assigns these 51 activities to this code. If your business matches one, this is your code.
- Adobe bricks manufacturing
- Alumina fused refractories manufacturing
- Aluminous refractory cement manufacturing
- Architectural terra cotta manufacturing
- Bauxite brick manufacturing
- Blocks, fire clay, manufacturing
- Bricks (i.e., common, face, glazed, hollow, vitrified), clay, manufacturing
- Bricks, adobe, manufacturing
- Bricks, clay refractory, manufacturing
- Bricks, nonclay refractory, manufacturing
- Building tile, clay, manufacturing
- Carbon brick manufacturing
- Castable refractories, clay, manufacturing
- Castable refractories, nonclay, manufacturing
- Cement, clay refractory, manufacturing
- Ceramic tiles, floor and wall, manufacturing
- Clay refractories (e.g., mortar, brick, tile, block) manufacturing
- Conduit, vitrified clay, manufacturing
- Coping, wall, clay, manufacturing
- Crucibles, fire clay, manufacturing
- Crucibles, graphite, magnesite, chrome, silica, or other nonclay materials, manufacturing
- Drain tile, clay, manufacturing
- Firebrick, clay refractories, manufacturing
- Floaters, glasshouse, clay, manufacturing
- Floor tile, ceramic, manufacturing
- Flue lining, clay, manufacturing
- Glasshouse refractories manufacturing
- Insulating firebrick and shapes, clay, manufacturing
- Kiln furniture, clay, manufacturing
- Liner brick and plates, vitrified clay, manufacturing
- Magnesia refractory cement manufacturing
- Mortar, nonclay refractory, manufacturing
- Mortars, clay refractory, manufacturing
- Mosaic tile, ceramic, manufacturing
- Nonclay refractories (e.g., block, brick, mortar, tile) manufacturing
- Paving brick, clay, manufacturing
- Pots, glasshouse, clay refractory, manufacturing
- Quarry tiles, clay, manufacturing
- Refractories (e.g., block, brick, mortar, tile), clay, manufacturing
- Refractories (e.g., block, brick, mortar, tile), nonclay, manufacturing
- Refractory cement, nonclay, manufacturing
- Roofing tile, clay, manufacturing
- Sewer pipe and fittings, clay, manufacturing
- Stove lining, clay, manufacturing
- Structural clay tile manufacturing
- Tile, ceramic wall and floor, manufacturing
- Tile, clay, refractory, manufacturing
- Tile, clay, structural, manufacturing
- Tile, roofing and drain, clay, manufacturing
- Tile, sewer, clay, manufacturing
- Wall tile, ceramic, manufacturing
SBA size standard for 327120
To count as a small business for SBA loans and federal contracts under NAICS 327120, your business (including affiliates) must not exceed 750 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: 2391, 2392, 2395), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.