423840

Industrial Supplies Merchant Wholesalers

Wholesale Trade › Merchant Wholesalers, Durable Goods › Machinery, Equipment, and Supplies Merchant Wholesalers

SBA Size Standard

500 employees

Employee-Based Verify at SBA.gov →

NAICS Code Hierarchy

42

Sector

Wholesale Trade

423

Subsector

Merchant Wholesalers, Durable Goods

4238

Industry Group

Machinery, Equipment, and Supplies Merchant Wholesalers

423840

National Industry (This Code)

Industrial Supplies Merchant Wholesalers

Official NAICS Description

Source: U.S. Census Bureau 2022 NAICS

📘 Source: U.S. Census Bureau — 2022 NAICS Manual
This industry comprises establishments primarily engaged in the merchant wholesale distribution of supplies for machinery and equipment generally used in manufacturing, oil well, and warehousing activities. Illustrative Examples: Industrial containers merchant wholesalers Industrial diamonds merchant wholesalers Printing inks merchant wholesalers Industrial sand merchant wholesalers Refractory materials (e.g., brick, blocks, shapes) merchant wholesalers Welding supplies (except welding gases) merchant wholesalers

✓ Small Business Eligibility at a Glance

Based on SBA Table of Small Business Size Standards (2024)

Size Standard

500 employees

Measurement Period

Current count

Standard Type

Employee-Based

Applies To

All contracts under NAICS 423840

Set-Aside Programs

8(a), WOSB, HUBZone, SDVOSB

Certification Required

No (self-certify in SAM.gov)

Size standards are set by the SBA and reviewed periodically. Always verify at SBA.gov before bidding.

Cross-References

The following activities are classified elsewhere in the NAICS system:

Merchant wholesale distribution of hydraulic and pneumatic (fluid power) pumps, motors, pistons, and valves--are classified in Industry 423830, Industrial Machinery and Equipment Merchant Wholesalers; and
Merchant wholesale distribution of welding gases and other industrial gases--are classified in Industry 424690, Other Chemical and Allied Products Merchant Wholesalers.

How to Use NAICS 423840 in SAM.gov

NAICS code 423840Industrial Supplies Merchant Wholesalers — is used in SAM.gov to identify businesses whose primary activity falls within this classification. When you add this code to your SAM.gov entity registration, contracting officers searching for vendors in the Machinery, Equipment, and Supplies Merchant Wholesalers space will be able to find your business.

If this code represents your primary business activity, designate it as your primary NAICS code. Your primary NAICS code determines your size standard for any contract solicited under this code. With a size standard of 500 employees, your business must be at or below this threshold to qualify as a small business for set-aside contracts under NAICS 423840.

Log in Entity Registration Goods & Services Add NAICS Code Enter 423840 Save

Frequently Asked Questions

What is NAICS code 423840?

NAICS code 423840 is 'Industrial Supplies Merchant Wholesalers', classified under the Wholesale Trade sector (NAICS 42). This industry comprises establishments primarily engaged in the merchant wholesale distribution of supplies for machinery and equipment generally used in manufacturing, oil well, and warehousing activ

What is the SBA small business size standard for NAICS code 423840?

The SBA defines a small business under NAICS code 423840 (Industrial Supplies Merchant Wholesalers) as one with 500 employees. This size standard determines eligibility for small business set-aside contracts, 8(a), HUBZone, WOSB, and SDVOSB programs in SAM.gov.

How do I register NAICS code 423840 in SAM.gov?

To register NAICS code 423840 in SAM.gov: (1) Log in at sam.gov, (2) Navigate to your Entity Registration, (3) Go to the Assertions section, (4) Add 423840 (Industrial Supplies Merchant Wholesalers) to your NAICS code list. You may designate one code as your Primary NAICS code.

Quick Actions

Related NAICS Codes

Other codes in Machinery, Equipment, and Supplies Merchant Wholesalers

Related PSC Codes

PSC codes commonly used with this NAICS sector

Source: GSA PSC Manual April 2025

GovBidLab Pro

Not sure which NAICS codes fit your business?

GovBidLab's Federal Sales Roadmap includes a complete NAICS and PSC code strategy tailored to your business.

Get Your Free Consultation

No commitment required • Response within 24 hours

Find Another NAICS Code

Search all 1,012 NAICS codes with SBA size standards and descriptions

Browse by sector:

Agriculture Construction Manufacturing Information/IT Health Care