NAICS 3315 - Foundries

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Key Terms

NAICS 331 foundry metal casting molten metal molds dies deburring cleaning machining metal components smelting primary metals defense contracting infrastructure parts manufacturing

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What is NAICS 3315

NAICS code 3315 covers the industry group known as Foundries, which primarily includes establishments engaged in pouring molten metal into molds or dies to form castings. These businesses specialize in creating metal castings from purchased metals or through integrated secondary smelting and casting processes. Foundries often perform finishing operations such as cleaning and deburring on the castings they produce, but more precise machining or assembly activities are classified under different manufacturing sectors. Foundries play a crucial role in supplying raw cast components that serve as essential building blocks for various industries, including automotive, aerospace, construction, and defense. Government agencies contract with foundries to obtain durable, custom metal castings for use in infrastructure projects, military equipment, and critical machinery, ensuring the production of high-quality components that meet stringent specifications and standards.

Industry Classification for NAICS 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 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 made.

Breakdown for NAICS 3315

  • Includes establishments primarily engaged in pouring molten metal into molds or dies to create castings.
  • Focuses on producing raw castings, with further machining or assembly classified elsewhere.
  • Foundries may perform finishing processes like cleaning and deburring on their castings.
  • Establishments making both primary metals and castings are classified under Primary Metal Manufacturing (Subsector 331).
  • Typical projects include producing castings for automotive, aerospace, defense, and infrastructure applications.

Included Activities for NAICS 3315

  • Pouring molten metal into molds or dies to form metal castings.
  • Performing cleaning, deburring, and finishing operations on castings.
  • Casting from purchased metals or integrated secondary smelting and casting processes.
  • Supplying custom metal castings for government and commercial use.
  • Producing castings for automotive, defense, energy, and construction sectors.
  • Collaborating with manufacturers for casting design and specification compliance.
  • Maintaining quality control to meet government standards and certifications.

Business Types for NAICS 3315

  • Metal casting foundries
  • Secondary smelting and casting facilities
  • Custom casting manufacturers
  • Small and medium metal fabrication firms
  • Defense contractors specializing in metal components

Government Buyers for NAICS 3315

Government agencies that commonly purchase foundry services include the Department of Defense, the Department of Transportation, the Department of Energy, and various state and local government bodies. These agencies require metal castings for a wide range of applications such as military vehicle parts, infrastructure components like bridge fittings, energy sector equipment, and specialized machinery. The need for durable, precise castings that can withstand harsh environments and heavy use drives government demand. Additionally, foundries often supply parts for maintenance and repair operations, which are critical to sustaining government-owned assets and mission-critical systems.

Contract Types & Procurement for NAICS 3315

Contracts in the foundry sector are typically awarded through competitive bidding, including firm-fixed-price and indefinite-delivery/indefinite-quantity (IDIQ) contracts. Procurement methods often involve requests for proposals (RFPs) or invitations for bids (IFBs) depending on the complexity and volume of the casting requirements. Contract values vary widely based on the size and complexity of the castings, ranging from small orders for replacement parts to multi-million-dollar contracts for large-scale production runs. Long-term contracts and blanket purchase agreements are common for ongoing supply needs, especially in defense and infrastructure projects.

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