NAICS 4 Digit Industry Group 3315

Industry Group 3315

NAICS 4 digit Industry Group 3315 – Foundries

Definition of NAICS 4 digit industry group 3315: This industry group comprises establishments primarily engaged in pouring molten metal into molds or dies to form castings. Establishments making castings and further manufacturing, such as machining or assembling, a specific manufactured product are classified in the industry of the finished product. Foundries may perform operations, such as cleaning and deburring, on the castings they manufacture. More involved processes, such as tapping, threading, milling, or machining to tight tolerances, that transform castings into more finished products are classified elsewhere in the Manufacturing sector based on the product being made.


Establishments in this industry group make castings from purchased metals or in integrated secondary smelting and casting facilities. When the production of primary metals is combined with making castings, the establishment is classified in Subsector 331, Primary Metal Manufacturing, with the primary metal being made.

Four Digit Industry Group Breakdown for North American Industry Classification System

NAICS codes are broken down by digit. The broadest description starts with the 2 digit sector codes. The 3 digit subsector codes are more specific, then the 4 digit industry group (Where you are now), 5 digit industry, and the most specific is the 6 digit NAICS code. If industry group 3315 does not describe the industry of the business in question, then select the largest applicable code below. From there, follow through the progression of smaller digits to the larger digits in order to obtain the most specific 6 digit classification.

  • Sector 31-33: Manufacturing
    • Subsector 331: Primary Metal Manufacturing
      • Industry Group 3315: Foundries
        • Industry 33151: Ferrous Metal Foundries
          • 6 Digit Code(s) NAICS 331511: Iron Foundries
          • 6 Digit Code(s) NAICS 331512: Steel Investment Foundries
          • 6 Digit Code(s) NAICS 331513: Steel Foundries (except Investment)
        • Industry 33152: Nonferrous Metal Foundries
          • 6 Digit Code(s) NAICS 331523: Nonferrous Metal Die-Casting Foundries
          • 6 Digit Code(s) NAICS 331524: Aluminum Foundries (except Die-Casting)
          • 6 Digit Code(s) NAICS 331529: Other Nonferrous Metal Foundries (except Die-Casting)

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NAICS 4 Digit Industry Group 3315