SIC 3731 — Ship Building and Repairing
Description & Classification
SIC code 3731 representing 'Ship Building and Repairing' 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 336611 - Ship Building and Repairing (via SIC1987:3731→NAICS1997:336611→2002:336611→2007:336611→2012:336611→2017:336611→2022:336611)
- NAICS 488390 - Other Support Activities for Water Transportation (via SIC1987:3731→NAICS1997:48839→2002:488390→2007:488390→2012:488390→2017:488390→2022:488390)
Classification Details
| SIC Code | 3731 |
|---|---|
| Industry Title | Ship Building and Repairing |
| Division | Division D: Manufacturing |
| Major Group | Major Group 37: Transportation Equipment |
| Source / Verified | US Census 1987 SIC Concordance / 2026-06-28 |
Related Resources & Compliance Guides
Further regulatory reference links for legacy SIC code 3731:
- 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 37 Hub — View other legacy industries in this business division.
Related Industries in Major Group 37
Frequently Asked Questions (FAQ)
What industry does SIC code 3731 represent?
SIC 3731 is 'Ship Building and Repairing', a 4-digit Standard Industrial Classification (SIC) code under Major Group 37: Transportation Equipment (Division D: Manufacturing); it maps to modern 2022 NAICS code(s): 336611 (Ship Building and Repairing), 488390 (Other Support Activities for Water Transportation).
What is the modern 2022 NAICS mapping for SIC 3731?
SIC code 3731 maps to modern NAICS codes: 336611 - Ship Building and Repairing, 488390 - Other Support Activities for Water Transportation.