SIC Code 3399 — Primary Metal Products, Not Elsewhere Classified

4-digit industry in the 1987 Standard Industrial Classification — still requested by banks, insurers, SEC filings and legacy systems.

Code	3399
Title	Primary Metal Products, Not Elsewhere Classified
System	SIC 1987 (final edition — replaced by NAICS in 1997)

The SIC was last revised in 1987 and officially superseded by NAICS in 1997, but it never fully disappeared: the SEC still tags EDGAR filings with SIC codes, and many banks, insurers and legacy databases keep requesting it. That is why converting between the two systems is still routine work.

NAICS equivalents of SIC 3399

From the official U.S. Census concordance (1987 SIC → 2002 NAICS). Where the 2002 code no longer exists in NAICS 2022, the closest current code is shown.

NAICS 2002	Title (2002)	Current 2022 code
331111	Iron and Steel Mills	superseded — closest: 33111 Iron and Steel Mills and Ferroalloy Manufacturing
331221	Rolled Steel Shape Manufacturing	331221 (same code)
331314	Secondary Smelting and Alloying of Aluminum	331314 (same code)
331423	Secondary Smelting, Refining, and Alloying of Copper	superseded — closest: 33142 Copper Rolling, Drawing, Extruding, and Alloying
331492	Secondary Smelting, Refining, and Alloying of Nonferrous Metal (except Copper and Aluminum)	331492 (same code)
332618	Other Fabricated Wire Product Manufacturing	332618 (same code)
332813	Electroplating, Plating, Polishing, Anodizing and Coloring	332813 (same code)

Other SIC codes in 33xx

• 3312 — Steel Works, Blast Furnaces (Including Coke Ovens), and Rolling Mills
• 3313 — Electrometallurgical Products, Except Steel
• 3315 — Steel Wiredrawing and Steel Nails and Spikes
• 3316 — Cold-Rolled Steel Sheet, Strip, and Bars
• 3317 — Steel Pipe and Tubes
• 3321 — Gray and Ductile Iron Foundries
• 3322 — Malleable Iron Foundries
• 3324 — Steel Investment Foundries
• 3325 — Steel Foundries, Not Elsewhere Classified
• 3331 — Primary Smelting and Refining of Copper
• 3334 — Primary Production of Aluminum
• 3339 — Primary Smelting and Refining of Nonferrous Metals, Except Copper and Aluminum

Data: 1987 SIC titles (OSHA/Census) and official Census concordance — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.