Modern industrial and commercial projects are complex and require a large number of contractors, including electricians, plumbers, integrators and fabricators, all working simultaneously. But finding reliable suppliers for every trade, especially those who understand the complexity and urgency of B2B requirements, is not easy. This curated list highlights the top 10 e-commerce vendors in their category specifically for B2B businesses across different industries. Each of these companies is a true specialist in its field. The list includes wiring, HVAC, automation, stabilizers, fluid systems, and more. These are the digital-first partners with useful websites that you want in your shopping group for excellent service and great product lists.
The criteria on which the list is based are:
diverse
Strong e-commerce presence
Focus on B2B and professional customer base
Product depth
Technical value and innovation
Nassau National Cable
Category: Electrical wires and cables
Founded in 2013 as an e-commerce platform, Nassau National Cable is a prominent wire and cable distributor, serving contractors, manufacturers, and facility managers throughout the United States. The company is known for its wide product range, covering everything from THHN and MC cables to PV wires, VFD cables and even LSZH and mining grade options. The main focus is on aluminum and copper electrical cables.
Backed by stable, long-term relationships with key manufacturers, Nassau offers consistent prices that are often below market, especially on large volume orders. It is a modern e-commerce platform that provides comprehensive ordering, customized services (including multiple stripping and markdowns), and transparent online inventory visibility for thousands of SKUs. Nassau National Cable also supports bulk orders for major contractors.
Strengths:
Stable partnerships with suppliers enable competitive prices
Custom cable setup (cut by foot, stripping, assemblies)
Live chat and phone support with a quick quote
Bulk pricing programs, rebates, and dealer tiers for repeat customers
Real-time inventory visibility and digital purchasing across many cable categories
Main Products:
THHN, XHHW-2, NM-B, and UF-B copper building wire
Aluminum cables SER, SEU, and URD
MC/TC tray and armored cable
Medium voltage cable (MV-90, MV-105).
Solar PV wire, VFD cable, fiber and LSZH options
Mining and industrial cables
SOOW, DLO and other types of portable power cables
SupplyHouse.com
Category: Plumbing and air conditioning systems
SupplyHouse.com is one of the leading online distributors specializing in plumbing, heating and air conditioning supplies. It’s designed specifically for professional contractors, although the site is completely accessible to everyone. The platform provides one of the most intuitive shopping experiences in the industry, featuring fast order fulfillment and stock guarantees. SupplyHouse primarily focuses on SKUs for heating, ventilation and air conditioning (HVAC) systems, including zone valves, thermostats and hydronic systems.
Strengths:
Deep inventory of HVAC and hydronic components
Competitive prices with professional customer support
Ecommerce tools designed for contractors and merchandising teams
Main Products:
Thermostats, zone valves, and circulation pumps
PEX tubing, copper tubing, and fittings
Boilers, expansion tanks and radiant heat systems
Small separate units and HVAC controls
Raw plumbing materials and repair kits
McMaster Carr
Classification: Industrial hardware and fasteners
McMaster-Carr is a 125-year-old American company known worldwide for its extensive catalog of exclusive, hard-to-find hardware, fasteners, tools and mechanical components. With an interface designed for speed and detail, engineers and site managers rely on McMaster for everything from stainless screws to precision linear bearings. Their same-day shipping promise and comprehensive inventory make them a top-tier B2B partner for industrial buyers.
Strengths:
Over 700,000 SKUs with detailed specifications and CAD
Same day shipping on most orders
Long trusted by engineers, OEMs and manufacturers
Main Products:
Bolts, rivets, washers, rivets and anchors
Shaft collars, gears, bushings and pulleys
Tools and hand tools
Industrial adhesives, gaskets and seals
Metal sheets, bars and extrusion profiles
Egos
Category: Plastic movement and cable management
Igus is a global leader in motion plastics providing high-performance polymer components for dynamic applications such as robotics, automated manufacturing and industrial motion control. The brand is known for its Chainflex cable systems, power chains, and linear guides designed for longevity in high-cycle environments. These components are designed to withstand millions of motion cycles without lubrication, helping prevent cable damage, reduce downtime and enable safe, flexible motion in multi-axis systems. Its online configuration tools and CAD integration make it a favorite destination for machine builders and automation engineers.
Strengths:
We specialize in highly durable polymer systems
Products optimized for movement, wear resistance and reduced friction
Huge investment in R&D and internal testing
Patented products
Main Products:
Power chains and cable trays
Chainflex flexible robotic cable
Linear guidance systems
DryLin linear bearings and slides
3D printable plastic machinery parts
AutomationDirect
Category: Industrial automation and control
AutomationDirect is the most accessible source for budget-friendly industrial automation equipment. They’re a favorite among board makers and machine designers looking for PLCs, sensors, relays, and power supplies. With low pricing, transparent availability, and excellent documentation, AutomationDirect serves as an easy-to-use hub for serious automation professionals.
Strengths:
Competitive pricing across automation devices
Easy ordering, fast shipping and free technical resources
Wide compatibility with OEM control panels and systems
Main Products:
PLC, HMI, and I/O modules
Sensors (proximity, photoelectric, ultrasonic)
Power supplies, relays, and timers
Terminal blocks, DIN rails, and attachments
Pneumatics and engine control devices
Kelly Company
Category: Building automation components
Kele is a specialized distribution company fully focused on Building Automation Systems (BAS). Whether you’re managing temperature, lighting or access, Kele provides the controls that keep commercial buildings running efficiently. Its deep relationships with legacy brands and focus on vintage or specialty components make it especially valuable for retrofits and power upgrades.
Strengths:
Specializing in automation components that are difficult to source
Designed for HVAC contractors and BAS integrators
Known for excellent phone support and fast execution
Main Products:
Temperature and humidity sensors
Damper actuators, valve actuators, and couplings
Pressure transducers and differential sensors
Access control panels and lighting relays
BACnet and Modbus controllers
Zoro
Classification: Tools, maintenance, repair, overhaul, and contractor supplies
Zoro.com is a massive B2B e-commerce platform with millions of SKUs, including job site tools, safety equipment, electrical accessories, and HVAC components. They are known for their bulk purchasing deals, intuitive filters, and responsive business support. Whether you’re storing a truck or an entire warehouse, Zoro makes it easy.
Strengths:
Huge catalog with competitive contracting prices
Excellent for MRO and purchasing general supplies
Fast shipping and quantity discounts
Main Products:
Power tools, hand tools, drill bits
Personal protective equipment, respirators and gloves
HVAC belts, filters, and blowers
Electrical testing devices, boxes and devices
Lighting fixtures and site equipment
Misumi USA
Category: Mechanical components and custom factory components
Misumi is designed for engineers who need custom mechanical parts, including linear shafts, brackets, guide rods, plates and precision bushings. Misumi parts are widely used in automation equipment, testing devices, and precision manufacturing.
Strengths:
Superior mechanical components
Designed for design engineers, integrators and OEMs
Fast production and shipping of custom parts
Main Products:
Shafts, plates, and brackets (customizable)
Linear guides and actuators
Framing components and machine base parts
Screw drives and gear systems
Sensor and actuator mounting kits
American Plastic Company
Classification: Processing of liquids and industrial plastics
US Plastic Corp is a well-known supplier of industrial plastic components used in fluid transportation, chemical processing, agriculture, and laboratory environments. The company provides pipes, valves, tanks and tubes that convey fluids in harsh or aseptic conditions, all made of high-quality materials.
Strengths:
Chemical and food resistant product options
Long experience in plastic materials
Trusted in agriculture, laboratories and wastewater treatment
Main Products:
Plastic tanks and chemical containers
Valves, faucets and fittings
Pipes (PVC, HDPE, fluoropolymer)
Flow meters, level indicators
Laboratory tools and sanitary tubes
MSC Industrial Supplies
Category: MRO, metalworking and industrial tools
MSC is one of the largest distributors of maintenance, repair and operations (MRO) supplies in North America. In particular, it sells metalworking, cutting and support tools in stores. Large manufacturing plants rely on MSC for both everyday consumables and precision instruments, supported by expert technical assistance and procurement solutions.
Strengths:
Extensive catalog of metal fabrication and fabrication
On-site support and procurement integration
Serves factories, warehouses and heavy industries
Main Products:
End mills, reamers, and turning tools
Abrasives, grinders and shop chemicals
Shop ground safety equipment and signage
Threading and tapping tools
Holding work and cutting fluids
