2022 NAICS national industry in sector 42 Wholesale Trade
423840 Industrial Supplies Merchant Wholesalers
NAICS 423840 is the US industry code for industrial supplies merchant wholesalers. It covers establishments primarily engaged in the merchant wholesale distribution of supplies for machinery and equipment generally used in manufacturing, oil well, and warehousing activities.
- Code
- 423840 (2022 NAICS)
- Title
- Industrial Supplies Merchant Wholesalers
- Part of
- Machinery, Equipment, and Supplies Merchant Wholesalers
- SBA small business limit
- Up to 125 employees
- Closest UK SIC
- 46690 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
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.
Examples Census gives
- 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
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- 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.
- Merchant wholesale distribution of welding gases and other industrial gases are classified in Industry 424690, Other Chemical and Allied Products Merchant Wholesalers.
Activities listed under 423840
The Census index assigns these 60 activities to this code. If your business matches one, this is your code.
- Abrasives merchant wholesalers
- Barrels, new and reconditioned, merchant wholesalers
- Bearings merchant wholesalers
- Belting, industrial, merchant wholesalers
- Bottles (except waste) merchant wholesalers
- Box shooks merchant wholesalers
- Boxes and crates, industrial (except disposable plastics, paperboard, waste), merchant wholesalers
- Brushes, industrial, merchant wholesalers
- Canning supplies merchant wholesalers
- Cartons (except paper and paperboard) merchant wholesalers
- Closures, industrial, merchant wholesalers
- Containers, industrial, merchant wholesalers
- Cooperage stock merchant wholesalers
- Cordage merchant wholesalers
- Cork merchant wholesalers
- Crowns and closures, metal, merchant wholesalers
- Diamonds, industrial, merchant wholesalers
- Drives and gears merchant wholesalers
- Drums, new and reconditioned, merchant wholesalers
- Excelsior (e.g., pads, wrappers) merchant wholesalers
- Fire hydrants merchant wholesalers
- Fittings, industrial, merchant wholesalers
- Gaskets merchant wholesalers
- Gears merchant wholesalers
- General-line industrial supplies merchant wholesalers
- Grommets merchant wholesalers
- Hose, industrial, merchant wholesalers
- Industrial containers merchant wholesalers
- Industrial diamonds merchant wholesalers
- Industrial leather products merchant wholesalers
- Industrial pottery products merchant wholesalers
- Industrial supplies (except disposable plastics, paper) merchant wholesalers
- Inks, printing, merchant wholesalers
- Lapidary equipment, industrial, merchant wholesalers
- Mechanical power transmission supplies (e.g., gears, pulleys, sprockets) merchant wholesalers
- Mechanical rubber goods merchant wholesalers
- Mill supplies merchant wholesalers
- Packaging materials merchant wholesalers
- Packing materials merchant wholesalers
- Pipe fittings and valves (except plumbing) merchant wholesalers
- Pistons and valves, industrial, merchant wholesalers
- Plastics foam packing and packaging materials merchant wholesalers
- Power transmission supplies (e.g., gears, pulleys, sprockets), mechanical, merchant wholesalers
- Printing inks merchant wholesalers
- Reconditioned barrels and drums merchant wholesalers
- Refractory materials (e.g., block, brick, mortar, tile) merchant wholesalers
- Ropes (except wire rope) merchant wholesalers
- Rubber goods, mechanical (i.e., extruded, lathe-cut, molded), merchant wholesalers
- Sand, industrial, merchant wholesalers
- Seals merchant wholesalers
- Shipping containers (except disposable plastics, paper) merchant wholesalers
- Shipping pails, metal, merchant wholesalers
- Speed changers merchant wholesalers
- Sprockets merchant wholesalers
- Thread, industrial, merchant wholesalers
- Towels, industrial, merchant wholesalers
- Twine merchant wholesalers
- Valves (except hydraulic, plumbing, pneumatic) merchant wholesalers
- Welding supplies (except welding gases) merchant wholesalers
- Wiping cloths merchant wholesalers
SBA size standard for 423840
To count as a small business for SBA loans and federal contracts under NAICS 423840, your business (including affiliates) must not exceed 125 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 4659, 4669), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
- 423810Construction and Mining (except Oil Well) Machinery and Equipment Merchant Wholesalers
- 423820Farm and Garden Machinery and Equipment Merchant Wholesalers
- 423830Industrial Machinery and Equipment Merchant Wholesalers
- 423850Service Establishment Equipment and Supplies Merchant Wholesalers
- 423860Transportation Equipment and Supplies (except Motor Vehicle) Merchant Wholesalers
Data last changed November 14, 2026. How this page is built.