What is the modern NAICS equivalent for SIC 3999?

Q: What is the modern NAICS equivalent for SIC 3999?

SIC code 3999 maps to the following modern 2022 NAICS codes: 337127 - Institutional Furniture Manufacturing, 335210 - Small Electrical Appliance Manufacturing, 316110 - Leather and Hide Tanning and Finishing, 326199 - All Other Plastics Product Manufacturing, 336612 - Boat Building, 339930 - Doll, Toy, and Game Manufacturing, 333310 - Commercial and Service Industry Machinery Manufacturing, 339999 - All Other Miscellaneous Manufacturing, 325998 - All Other Miscellaneous Chemical Product and Preparation Manufacturing, 335131 - Residential Electric Lighting Fixture Manufacturing, 332999 - All Other Miscellaneous Fabricated Metal Product Manufacturing, 332216 - Saw Blade and Handtool Manufacturing.

Registry · SIC Index · Group 39

SIC 3999 — Manufacturing Industries, NEC

SIC 3999 is 'Manufacturing Industries, NEC', a 4-digit Standard Industrial Classification (SIC) code under Major Group 39: Miscellaneous Manufacturing Industries (Division D: Manufacturing); it maps to modern 2022 NAICS code(s): 337127 (Institutional Furniture Manufacturing), 335210 (Small Electrical Appliance Manufacturing).

Description & Classification

SIC code 3999 representing 'Manufacturing Industries, NEC' is an industry category in the Standard Industrial Classification (SIC) system under U.S. OSHA and Federal procurement registers.

Modern NAICS Crosswalk

Trace the modern equivalent classifications in the 2022 North American Industry Classification System (NAICS) database:

NAICS 337127 - Institutional Furniture Manufacturing (via SIC1987:3999→NAICS1997:337127→2002:337127→2007:337127→2012:337127→2017:337127→2022:337127)
NAICS 335210 - Small Electrical Appliance Manufacturing (via SIC1987:3999→NAICS1997:335211→2002:335211→2007:335211→2012:335210→2017:335210→2022:335210)
NAICS 316110 - Leather and Hide Tanning and Finishing (via SIC1987:3999→NAICS1997:31611→2002:316110→2007:316110→2012:316110→2017:316110→2022:316110)
NAICS 326199 - All Other Plastics Product Manufacturing (via SIC1987:3999→NAICS1997:326199→2002:326199→2007:326199→2012:326199→2017:326199→2022:326199)
NAICS 336612 - Boat Building (via SIC1987:3999→NAICS1997:326199→2002:326199→2007:336612→2012:336612→2017:336612→2022:336612)
NAICS 339930 - Doll, Toy, and Game Manufacturing (via SIC1987:3999→NAICS1997:339932→2002:339932→2007:339932→2012:339930→2017:339930→2022:339930)
NAICS 333310 - Commercial and Service Industry Machinery Manufacturing (via SIC1987:3999→NAICS1997:333319→2002:333319→2007:333319→2012:333318→2017:333318→2022:333310)
NAICS 339999 - All Other Miscellaneous Manufacturing (via SIC1987:3999→NAICS1997:339999→2002:339999→2007:339999→2012:339999→2017:339999→2022:339999)
NAICS 325998 - All Other Miscellaneous Chemical Product and Preparation Manufacturing (via SIC1987:3999→NAICS1997:325998→2002:325998→2007:325998→2012:325998→2017:325998→2022:325998)
NAICS 335131 - Residential Electric Lighting Fixture Manufacturing (via SIC1987:3999→NAICS1997:335121→2002:335121→2007:335121→2012:335121→2017:335121→2022:335131)
NAICS 332999 - All Other Miscellaneous Fabricated Metal Product Manufacturing (via SIC1987:3999→NAICS1997:332999→2002:332999→2007:332999→2012:332999→2017:332999→2022:332999)
NAICS 332216 - Saw Blade and Handtool Manufacturing (via SIC1987:3999→NAICS1997:332212→2002:332212→2007:332212→2012:332216→2017:332216→2022:332216)

Classification Details

SIC Code	3999
Industry Title	Manufacturing Industries, NEC
Division	Division D: Manufacturing
Major Group	Major Group 39: Miscellaneous Manufacturing Industries
Source / Verified	US Census 1987 SIC Concordance / 2026-06-28

Related Resources & Compliance Guides

Further regulatory reference links for legacy SIC code 3999:

SIC Codes Complete Compliance Guide — Detailed history and active legal applications of the SIC classification framework.
Why Legacy SIC Codes Persist Guide — How credit systems and the SEC still rely on SIC metadata.
SIC ↔ NAICS Crosswalk Tool — Trace industrial code conversions dynamically.
SIC Major Group 39 Hub — View other legacy industries in this business division.

Related Industries in Major Group 39

3911 - Jewelry, Precious Metal...3914 - Silverware, Plated Ware, and Stainless S...3915 - Jewelers Findings and Materials and Lapi...3931 - Musical Instruments...3942 - Dolls and Stuffed Toys...3944 - Games, Toys, and Children’s Vehicles, Ex...3949 - Sporting and Athletic Goods, NEC...3951 - Pens, Mechanical Pencils, and Parts...

Frequently Asked Questions (FAQ)

What industry does SIC code 3999 represent?

What is the modern 2022 NAICS mapping for SIC 3999?

SIC code 3999 maps to modern NAICS codes: 337127 - Institutional Furniture Manufacturing, 335210 - Small Electrical Appliance Manufacturing, 316110 - Leather and Hide Tanning and Finishing, 326199 - All Other Plastics Product Manufacturing, 336612 - Boat Building, 339930 - Doll, Toy, and Game Manufacturing, 333310 - Commercial and Service Industry Machinery Manufacturing, 339999 - All Other Miscellaneous Manufacturing, 325998 - All Other Miscellaneous Chemical Product and Preparation Manufacturing, 335131 - Residential Electric Lighting Fixture Manufacturing, 332999 - All Other Miscellaneous Fabricated Metal Product Manufacturing, 332216 - Saw Blade and Handtool Manufacturing.