SIC 3821 — Laboratory Apparatus and Furniture
Official OSHA SIC Manual Definition
Establishments primarily engaged in manufacturing laboratory apparatus and furniture. Important products of this industry include laboratory balances and scales, laboratory furnaces and ovens, laboratory centrifuges, and various components, parts, and accessories for laboratory apparatus. Laboratory instruments are classified elsewhere, generally in other industries of Industry Group 382.
Description & Classification
SIC code 3821 representing 'Laboratory Apparatus and Furniture' 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 SIC1987:3821→NAICS1997:339111→2002:339111→2007:337127→2012:337127→2017:337127→2022:337127)
- NAICS 333415 - Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing (via SIC1987:3821→NAICS1997:339111→2002:339111→2007:333415→2012:333415→2017:333415→2022:333415)
- NAICS 333998 - All Other Miscellaneous General Purpose Machinery Manufacturing (via SIC1987:3821→NAICS1997:339111→2002:339111→2007:333997→2012:333997→2017:333997→2022:333998)
- NAICS 339113 - Surgical Appliance and Supplies Manufacturing (via SIC1987:3821→NAICS1997:339111→2002:339111→2007:339113→2012:339113→2017:339113→2022:339113)
- NAICS 333248 - All Other Industrial Machinery Manufacturing (via SIC1987:3821→NAICS1997:339111→2002:339111→2007:333298→2012:333249→2017:333249→2022:333248)
- NAICS 333994 - Industrial Process Furnace and Oven Manufacturing (via SIC1987:3821→NAICS1997:339111→2002:339111→2007:333994→2012:333994→2017:333994→2022:333994)
Classification Details
| SIC Code | 3821 |
|---|---|
| Industry Title | Laboratory Apparatus and Furniture |
| Division | Division D: Manufacturing |
| Major Group | Major Group 38: Measuring, Analyzing, and Controlling Instruments; Photographic, Medical and Optical Goods; Watches and Clocks |
| JSON Endpoint | View as JSON · API → |
| Source / Verified | US Census 1987 SIC Concordance / 2026-08-08 |
SIC vs NAICS Compliance & Common Mismatches
Legacy SIC code 3821 classifies commercial operations based on primary end-product or service output under the 1987 federal framework. In contrast, modern 2022 NAICS codes group establishments based on production process inputs.
When submitting public disclosures to SEC EDGAR or determining OSHA workplace safety log recordkeeping exemptions (29 CFR Part 1904), rely strictly on the official OSHA 4-digit SIC classification rather than an automated commercial translation.
💡 Expert Guidance: SIC to NAICS Conversion
Common Compliance Mistake: Many contractors and B2B analysts confuse legacy 4-digit SIC codes like 3821 with modern 6-digit NAICS codes. Ensure that you use the correct active 2022 NAICS code (e.g. from the crosswalk below) when submitting representations on SAM.gov, as federal contracting officers only accept modern NAICS codes.
Related Pages & Tools
Further regulatory reference links for legacy SIC code 3821:
- 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 3821 to NAICS Crosswalk — Bidirectional mapping to modern NAICS codes (Laboratory Apparatus and Furniture).
- SIC Major Group 38 Hub — View other legacy industries in this business division.
Frequently Asked Questions (FAQ)
What industry sector is represented by legacy SIC code 3821? ▾
Legacy SIC code 3821 represents 'Laboratory Apparatus and Furniture', categorized under Division Division D: Manufacturing and Major Group Major Group 38: Measuring, Analyzing, and Controlling Instruments; Photographic, Medical and Optical Goods; Watches and Clocks. The Standard Industrial Classification (SIC) system was developed in the late 1930s.
What is the modern 2022 NAICS equivalent for legacy SIC 3821? ▾
Legacy SIC code 3821 maps to the modern 2022 NAICS industry classifications: NAICS 337127 (Institutional Furniture Manufacturing), NAICS 333415 (Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing), NAICS 333998 (All Other Miscellaneous General Purpose Machinery Manufacturing), NAICS 339113 (Surgical Appliance and Supplies Manufacturing), NAICS 333248 (All Other Industrial Machinery Manufacturing), NAICS 333994 (Industrial Process Furnace and Oven Manufacturing). Mappings are resolved transitively across successive updates to handle splits.
Why do credit agencies and banks still reference legacy SIC code 3821? ▾
Registries like Dun & Bradstreet, insurance underwriters, and private platforms retain SIC code 3821 because their historical financial risk data and scoring models are indexed using the legacy 4-digit SIC framework.
Does the SEC EDGAR system allow searching public filings by SIC 3821? ▾
Yes. The SEC Division of Corporation Finance assigns a primary 4-digit SIC code to public companies. You can search the EDGAR database using SIC code 3821 to group reporting peer firms.
How do OSHA safety recordkeeping rules apply to SIC code 3821? ▾
Under 29 CFR Part 1904 safety regulations, OSHA references legacy SIC codes including 3821 to determine if a physical establishment is required to maintain daily injury logs (Form 300) or is partially exempt.
What is the structural difference between SIC 3821 and NAICS codes? ▾
SIC code 3821 classifies establishments based on their final product output or market destination (what they sell), while modern NAICS codes classify them based on production processes and inputs (how they work).
What are the typical business activities classified under legacy SIC 3821? ▾
Typical business activities classified under legacy SIC 3821 are the operations associated with 'Laboratory Apparatus and Furniture'. Mapped modern NAICS codes can be referenced for specific current examples.
Is legacy SIC code 3821 uniform across all 50 U.S. states? ▾
Yes, the Standard Industrial Classification (SIC) system, including code 3821, was published as a federal standard and remains uniform nationwide. It is still referenced by various state workers' compensation boards and departments of labor.
Sources & References
- U.S. Department of Labor (OSHA): OSHA Standard Industrial Classification (SIC) Manual — Code 3821
- U.S. Census Bureau: 1987 SIC to 2022 NAICS Concordance Tables
- Federal Reserve Board: Industrial Production & Capacity Utilization Classifications
- Internal Revenue Service (IRS): Schedule C Principal Business Activity (PBA) Industry Concordance
- Office of Management and Budget (OMB): Standard Industrial Classification Systems Governance