What is the modern NAICS equivalent for SIC 3728?

Q: What is the modern NAICS equivalent for SIC 3728?

SIC code 3728 maps to the following modern 2022 NAICS codes: 336413 - Other Aircraft Parts and Auxiliary Equipment Manufacturing, 332912 - Fluid Power Valve and Hose Fitting Manufacturing, 541714 - Research and Development in Biotechnology (except Nanobiotechnology), 541713 - Research and Development in Nanotechnology, 541715 - Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology), 336411 - Aircraft Manufacturing.

Registry · SIC Index · Group 37

SIC 3728 — Aircraft Parts and Auxiliary Equipment, NEC

SIC 3728 is 'Aircraft Parts and Auxiliary Equipment, NEC', 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): 336413 (Other Aircraft Parts and Auxiliary Equipment Manufacturing), 332912 (Fluid Power Valve and Hose Fitting Manufacturing).

Description & Classification

SIC code 3728 representing 'Aircraft Parts and Auxiliary Equipment, 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 336413 - Other Aircraft Parts and Auxiliary Equipment Manufacturing (via SIC1987:3728→NAICS1997:336413→2002:336413→2007:336413→2012:336413→2017:336413→2022:336413)
NAICS 332912 - Fluid Power Valve and Hose Fitting Manufacturing (via SIC1987:3728→NAICS1997:332912→2002:332912→2007:332912→2012:332912→2017:332912→2022:332912)
NAICS 541714 - Research and Development in Biotechnology (except Nanobiotechnology) (via SIC1987:3728→NAICS1997:54171→2002:541710→2007:541711→2012:541711→2017:541714→2022:541714)
NAICS 541713 - Research and Development in Nanotechnology (via SIC1987:3728→NAICS1997:54171→2002:541710→2007:541711→2012:541711→2017:541713→2022:541713)
NAICS 541715 - Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) (via SIC1987:3728→NAICS1997:54171→2002:541710→2007:541712→2012:541712→2017:541715→2022:541715)
NAICS 336411 - Aircraft Manufacturing (via SIC1987:3728→NAICS1997:336411→2002:336411→2007:336411→2012:336411→2017:336411→2022:336411)

Classification Details

SIC Code	3728
Industry Title	Aircraft Parts and Auxiliary Equipment, NEC
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 3728:

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

3711 - Motor Vehicles and Passenger Car Bodies...3713 - Truck and Bus Bodies...3714 - Motor Vehicle Parts and Accessories...3715 - Truck Trailers...3716 - Motor Homes...3721 - Aircraft...3724 - Aircraft Engines and Engine Parts...3731 - Ship Building and Repairing...

Frequently Asked Questions (FAQ)

What industry does SIC code 3728 represent?

What is the modern 2022 NAICS mapping for SIC 3728?

SIC code 3728 maps to modern NAICS codes: 336413 - Other Aircraft Parts and Auxiliary Equipment Manufacturing, 332912 - Fluid Power Valve and Hose Fitting Manufacturing, 541714 - Research and Development in Biotechnology (except Nanobiotechnology), 541713 - Research and Development in Nanotechnology, 541715 - Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology), 336411 - Aircraft Manufacturing.