Modern industrial and commercial projects are complex and require a multitude of contractors, including electricians, plumbers, integrators, and fabricators, all working in sync. But finding reliable suppliers for each trade, especially ones that understand the complexity and urgency of B2B demands, isn’t easy. This curated list highlights the 10 best-in-class e-commerce suppliers specifically cut for B2B across different industrial domains. Each of these companies is a true specialist in its field. The list includes wiring, HVAC, automation, fasteners, fluid systems, and others. These are the digital-first partners with useful websites you want in your procurement stack for excellent service and large product lists.

The criteria the list is based on are:

• Variety

• Strong e-commerce presence

• B2B Focus and Professional Customer Base

• Product Depth

• Technical Value and Innovation

Nassau National Cable

Category: Electrical Wire & Cable

Founded in 2013 as an e-commerce platform, Nassau National Cable is a prominent distributor of wire and cable, serving contractors, manufacturers, and facility managers across the United States. The company is known for its extensive product range, covering everything from THHN and MC cable to PV wire, VFD cable, 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 and often below-market pricing, especially on large-volume orders. It is a modern e-commerce platform that provides cut-to-length ordering, custom services (including stripping and multiple cuts), and transparent online stock visibility for thousands of SKUs. Nassau National Cable also supports bulk orders for large contractors.

Strengths:

• Stable supplier partnerships that enable competitive pricing

• Custom cable prep (by-the-foot cuts, stripping, assemblies)

• Live chat and phone support with fast quote turnaround

• Volume pricing programs, rebates, and reseller tiers for repeat customers

• Real-time stock visibility and digital purchasing across many cable categories

Key Products:

• THHN, XHHW-2, NM-B, and UF-B copper building wire

• SER, SEU, and URD aluminum cables

• MC/TC tray and armored cable

• Medium Voltage (MV-90, MV-105) cable

• Solar PV wire, VFD cable, fiber and LSZH options

• Mining and industrial cables

• SOOW, DLO, and other portable power cable types

SupplyHouse.com

Category: Plumbing & HVAC Systems

SupplyHouse.com is a leading online distributor specialising in plumbing, heating, and HVAC supplies. It is tailored to professional contractors, though the website is perfectly accessible to everyone. The platform offers one of the most intuitive shopping experiences in the industry, featuring fast order fulfilment and in-stock guarantees. SupplyHouse is primarily focused on HVAC-specific SKUs, including zone valves, thermostats, and hydronic systems.

Strengths:

• Deep inventory of HVAC and hydronic components

• Competitive pricing with pro-tier customer support

• E-commerce tools designed for contractors and trade teams

Key Products:

• Thermostats, zone valves, circulator pumps

• PEX tubing, copper pipe, and fittings

• Boilers, expansion tanks, and radiant heat systems

• Mini-split units and HVAC controls

• Plumbing rough-in materials and repair kits

McMaster-Carr

Category: Industrial Hardware & Fasteners

McMaster-Carr is a 125-year-old American company recognised worldwide for its extensive catalogue of hard-to-find, exclusive hardware, fasteners, tools, and mechanical components. With an interface built for speed and detail, engineers and site managers rely on McMaster for everything from stainless bolts to precision linear bearings. Their same-day shipping promise and exhaustive in-stock inventory make them a top-tier B2B partner for industrial buyers.

Strengths:

• Over 700,000 SKUs with detailed specs and CAD

• Same-day shipping on most orders

• Long-trusted by engineers, OEMs, and fabricators

Key Products:

• Bolts, screws, washers, rivets, and anchors

• Shaft collars, gears, bushings, and pulleys

• Tooling and hand tools

• Industrial adhesives, gaskets, and seals

• Sheet metal, rods, and extrusion profiles

Igus

Category: Motion Plastics & Cable Management

Igus is a global leader in motion plastics that offers high-performance polymer components for dynamic applications such as robotics, automated manufacturing, and industrial motion control. The brand is famous for its flexible cable systems (Chainflex), energy chains, and linear guides designed for longevity in high-cycle environments. These components are engineered to withstand millions of motion cycles without lubrication, helping prevent cable damage, reduce downtime, and enable safe, flexible movement in multi-axis systems. Their online configuration tools and CAD integration make them a go-to for machine builders and automation engineers.

Strengths:

• Specializes in high-durability polymer systems

• Products optimized for movement, wear-resistance, and friction reduction

• Heavy investment in R&D and in-house testing

• Patented products

Key Products:

• Energy chains and cable carriers

• Chainflex flexible robotic cables

• Linear guide systems

• DryLin linear bearings and slides

• 3D-printable plastic machine parts

AutomationDirect

Category: Industrial Automation & Controls

AutomationDirect is the most accessible source for budget-friendly industrial automation gear. It’s a favourite among panel builders and machine designers looking for PLCs, sensors, relays, and power supplies. With low prices, transparent availability, and excellent documentation, AutomationDirect serves as a DIY-friendly hub for serious automation professionals.

Strengths:

• Competitive pricing across automation hardware

• Easy ordering, fast shipping, and free tech resources

• Wide compatibility with control panels and OEM systems

Key Products:

• PLCs, HMIs, and I/O modules

• Sensors (proximity, photoelectric, ultrasonic)

• Power supplies, relays, and timers

• Terminal blocks, DIN rail, and enclosures

• Pneumatics and motor controllers

Kele, Inc.

Category: Building Automation Components

Kele is a niche distributor focused entirely on building automation systems (BAS). Whether managing temperature, lighting, or access, Kele offers the control hardware that keeps commercial buildings running efficiently. Its deep relationships with legacy brands and focus on obsolete or specialty components make it especially valuable for retrofits and energy upgrades.

Strengths:

• Specialized in hard-to-source automation components

• Tailored to HVAC contractors and BAS integrators

• Known for excellent phone support and fast fulfilment

Key Products:

• Temperature and humidity sensors

• Damper actuators, valve actuators, and linkages

• Pressure transducers and differential sensors

• Access control panels and lighting relays

• BACnet and Modbus controllers

Zoro

Category: Tools, MRO & Contractor Supplies

Zoro.com is a massive B2B e-commerce platform featuring millions of SKUs, including job site tools, safety gear, electrical accessories, and HVAC components. It’s known for bulk purchasing deals, intuitive filters, and responsive business support. Whether you're stocking a truck or an entire warehouse, Zoro makes it easy.

Strengths:

• Huge catalogue with competitive contractor pricing

• Excellent for MRO and general supply purchasing

• Fast shipping and quantity discounts

Key Products:

• Power tools, hand tools, drill bits

• PPE, respirators, and gloves

• HVAC belts, filters, and blowers

• Electrical testers, boxes, and hardware

• Lighting fixtures and site gear

Misumi USA

Category: Custom Mechanical & Factory Components

Misumi is designed for engineers who require custom mechanical parts, including linear shafts, brackets, guide rails, plates, and precision bushings. Misumi parts are widely used in automation equipment, testing setups, and precision manufacturing.

Strengths:

• Ultra-configurable mechanical components

• Built for design engineers, integrators, and OEMs

• Rapid production and shipping of custom parts

Key Products:

• Shafts, plates, and brackets (customizable)

• Linear guides and actuators

• Framing components and machine base parts

• Screw drives and gear systems

• Sensor and motor mounting kits

U.S. Plastic Corp.

Category: Fluid Handling & Industrial Plastics

U.S. Plastic Corp. is a well-known supplier of industrial-grade plastic components used in fluid transport, chemical processing, agriculture, and lab environments. The company provides piping, valves, tanks, and tubing that transport fluids in extreme or sterile conditions, all made from high-quality materials.

Strengths:

• Chemical-resistant and food-grade product options

• Longstanding expertise in plastic materials

• Trusted in agriculture, labs, and wastewater treatment

Key Products:

• Plastic tanks and chemical containers

• Valves, spigots, and fittings

• Tubing (PVC, HDPE, fluoropolymer)

• Flowmeters, level indicators

• Labware and sanitary piping

MSC Industrial Supply

Category: MRO, Metalworking & Industrial Tools

MSC is one of North America’s largest distributors of maintenance, repair, and operations (MRO) supplies. In particular, it sells metalworking, cutting tools, and shop-floor support. Large manufacturing plants rely on MSC for both everyday consumables and precision tooling, backed by expert technical assistance and procurement solutions.

Strengths:

• Extensive metalworking and machining catalogue

• On-site support and procurement integrations

• Serves factories, warehouses, and heavy industry

Key Products:

• End mills, reamers, and turning tools

• Abrasives, grinders, and shop chemicals

• Shop floor safety gear and signage

• Threading and tapping tools

• Workholding and cutting fluids