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    81131 - Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance

    If you’re involved in the repair and maintenance of commercial and industrial machinery, understanding NAICS code 81131 is essential. This industry classification plays a crucial role in the manufacturing, construction, and industrial sectors by ensuring that vital machinery operates efficiently and effectively. Whether you’re a business owner, contractor, or government agency, knowing the specifics of this NAICS code can help you navigate compliance, contracting opportunities, and market analysis with precision.


    What is NAICS Code 81131?

    NAICS Code 81131 represents the industry sector engaged in Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance. This classification excludes automotive and electronic equipment repair, focusing explicitly on machinery used across various commercial and industrial applications.

    Industry Definition

    This NAICS classification comprises establishments primarily engaged in:

    • Repairing and maintaining commercial and industrial machinery and equipment
    • Serving machinery used in manufacturing, construction, agriculture, and other industrial applications
    • Excluding services for automotive and electronic machinery

    Typical activities include routine maintenance, emergency repairs, overhaul services, and parts replacement.


    Sector Overview: Repair and Maintenance

    NAICS 81131 falls within the Repair and Maintenance sector, a vital segment responsible for prolonging machinery life cycles and minimizing downtime. Businesses under this code ensure operational continuity for:

    • Manufacturing plants
    • Construction sites
    • Industrial facilities
    • Agricultural operations

    Typical Business Activities under NAICS 81131

    Businesses classified under this NAICS code typically provide services such as:

    • Industrial machinery repair services: Repairing conveyors, pumps, turbines, or compressors.
    • Commercial equipment maintenance: Servicing HVAC units, cranes, or forklifts used in commercial settings.
    • Machinery overhaul and rebuilding services: Complete teardown and refurbishment of heavy machinery.

    These services are essential for maintaining productivity and safety standards within industrial environments.


    Size Standards for NAICS 81131 Eligibility

    For government contracting and eligibility purposes, the Small Business Administration (SBA) defines size standards for this industry as follows:

    • Size Standard: $16.5 million average annual receipts (4-year average)

    Businesses must fall under this threshold to qualify as a small business under NAICS code 81131, gaining access to various government programs and contracting opportunities.


    Examples of Businesses under NAICS 81131

    To better understand this category, here are common examples of businesses and services included:

    • Industrial machinery repair services: Companies specializing in fixing heavy machinery used in factories.
    • Commercial equipment maintenance: Firms maintaining material handling equipment like pallet jacks and forklifts.
    • Machinery overhaul and rebuilding: Businesses dedicated to comprehensive refurbishment of production machines and industrial tools.

    NAICS Code 81131 Details Table

    NAICS Code Title Sector Size Standard Key Activities Exclusions
    81131 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance Repair and Maintenance $16.5 million in average annual receipts Repair and maintain commercial and industrial machinery (non-automotive/electronic) Automotive and electronic equipment repair

    Frequently Asked Questions (FAQs)

    What types of machinery are covered under NAICS 81131?

    This code covers commercial and industrial machinery such as manufacturing equipment, construction machinery, agricultural machinery, and other heavy equipment excluding automotive and electronic devices.

    Does NAICS 81131 include automotive repair?

    No. Automotive repair and maintenance are excluded and fall under different NAICS codes like 811111 (General Automotive Repair).

    What is the SBA size standard for NAICS 81131?

    The size standard is $16.5 million in average annual receipts to qualify as a small business under this code.

    Can electronic equipment repair businesses use this NAICS code?

    No. Electronic equipment repair is excluded from NAICS 81131 and has separate classifications.

    How does NAICS 81131 impact government contracting?

    Businesses under this code can participate in federal contracting opportunities tailored for repair and maintenance services, especially if they meet the SBA small business criteria.


    Conclusion

    Understanding NAICS code 81131 is vital for companies involved in the repair and maintenance of commercial and industrial machinery—excluding automotive and electronic equipment. This classification not only identifies where your business fits in the larger industry landscape but also ensures compliance with government and industry requirements. By recognizing the size standards, typical activities, and business examples under this category, companies can better position themselves for growth and government contracting success.

    Stay informed, stay competitive! Use NAICS 81131 guidelines to unlock new business opportunities in the vital Repair and Maintenance sector.