SIC Code 3999 — Manufacturing Industries, Not Elsewhere Classified

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

Code	3999
Title	Manufacturing Industries, 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The SIC was last revised in 1987 and officially superseded by NAICS in 1997, but it never fully disappeared: the SEC still tags EDGAR filings with SIC codes, and many banks, insurers and legacy databases keep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 3999

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
316110	Leather and Hide Tanning and Finishing	316110 (same code)
321999	All Other Miscellaneous Wood Product Manufacturing	321999 (same code)
325998	All Other Miscellaneous Chemical Product and Preparation Manufacturing	325998 (same code)
326199	All Other Plastics Product Manufacturing	326199 (same code)
332211	Cutlery and Flatware (except Precious) Manufacturing	superseded — closest: 33221 Cutlery and Handtool Manufacturing
332212	Hand and Edge Tool Manufacturing	superseded — closest: 33221 Cutlery and Handtool Manufacturing
332812	Metal Coating, Engraving (except Jewelry and Silverware), and Allied Services to Manufacturers	332812 (same code)
332999	All Other Miscellaneous Fabricated Metal Product Manufacturing	332999 (same code)
333319	Other Commercial and Service Industry Machinery Manufacturing	superseded — closest: 33331 Commercial and Service Industry Machinery Manufacturing
335121	Residential Electric Lighting Fixture Manufacturing	renumbered — now 335131 (same title)
335211	Electric Housewares and Household Fan Manufacturing	superseded — closest: 33521 Small Electrical Appliance Manufacturing
337127	Institutional Furniture Manufacturing	337127 (same code)
339932	Game, Toy, and Children's Vehicle Manufacturing	superseded — closest: 33993 Doll, Toy, and Game Manufacturing
339999	All Other Miscellaneous Manufacturing	339999 (same code)

Other SIC codes in 39xx

• 3911 — Jewelry, Precious Metal
• 3914 — Silverware, Plated Ware, and Stainless Steel Ware
• 3915 — Jewelers' Findings and Materials, and Lapidary Work
• 3931 — Musical Instruments
• 3942 — Dolls and Stuffed Toys
• 3944 — Games, Toys, and Children's Vehicles, Except Dolls and Bicycles
• 3949 — Sporting and Athletic Goods, Not Elsewhere Classified
• 3951 — Pens, Mechanical Pencils, and Parts
• 3952 — Lead Pencils, Crayons, and Artists' Materials
• 3953 — Marking Devices
• 3955 — Carbon Paper and Inked Ribbons
• 3961 — Costume Jewelry and Costume Novelties, Except Precious Metal

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.