Contacts | McMaster-Carr

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5,096 Products

Most Likely Products

Switch Contact Blocks

Mount to switches to control electrical circuits as you move the switch

40 products

Terminals, Ferrules, and Lugs

Attach to the end of wire to connect circuits in control panels, motors, and machinery

1,267 products

Battery Contacts

Add or replace contacts in battery holders and circuit boards

18 products

All Results

Electrical Power, Networking, and Controlling

Switch Contact Blocks

Mount to switches to control electrical circuits as you move the switch

40 products

Push-Button Switch Contact Blocks

Pair with an actuator to create a custom switch

34 products

Magnetic Switches

Actuate when a magnet comes within sensing distance; often used to detect when doors or windows open

120 products

Limit Switches

Turn equipment on or off when objects touch the actuator; often used for conveyors and bin filling

153 products

Snap-Acting Switches

Open and close circuits quickly to minimize arcing and sticking; often used as door-open indicators

206 products

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

59 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

260 products

Proximity Sensors

Detect the presence or position of objects from a short sensing distance

13 products

Tilt Switches

Trip circuits when tilted; use as position indicators, pump level controls, and limit switches

8 products

Motor Switches

Turn motors, lighting, and electric heat circuits on and off

7 products

Transfer Switches

Switch to backup power during an outage

7 products

Ribbon Switch Termination Kits

Pair with your cut-to-length ribbon switch for a complete system

3 products

Emergency Stop Switches

Cut power to equipment during emergencies

5 products

Enclosure Door Switches

Control fans, lights, and other devices inside your enclosure when you open and close the door

2 products

Relay Contacts

Replace contacts on your relay

47 products

Relays

Electrically open and close circuits to control power to lights, motors, and other equipment

366 products

Motor Starters

Turn motors on and off and protect them from current overloads

410 products

Motor Starter Switches

Combine with a thermal overload element to build a starter that can handle high-current-rated motors

13 products

Motor Starter Thermal Overload Elements

Shut motors off if current exceeds the full-load current rating

28 products

Circuit Board Terminals

Connect wire to circuit boards

9 products

Circuit Board Voltage Regulators

Power circuits from a high-voltage source without frying your system

15 products

Safety Relays

Monitor circuits and force machines to a safe stop if the relay detects a fault

60 products

Monitoring Relays

Trip circuits or sound an alarm when voltage, current, or other limits are exceeded

31 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

48 products

Lighting Relays

Control lighting circuits and switch lighting systems on or off

13 products

Infrequent-Cycle Relays

Use with equipment that cycles on and off, such as HVAC systems

147 products

Air-Actuated Relays

Convert an air signal on a pneumatic control system to an electric one

1 product

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

Transistors

Boost weak electrical signals and rapidly control data transmission

20 products

Latching Relays

Lock into position so they don't require constant voltage to stay switched

27 products

Vehicle Relays

Switch high-current loads on vehicles, such as starters, headlights, and fuel pumps

36 products

Alternating Relays

Automatically split run time between two devices so one isn't always running

1 product

Terminals, Ferrules, and Lugs

Attach to the end of wire to connect circuits in control panels, motors, and machinery

1,267 products

Terminal Blocks

Create tidy rows of wire connections that you can identify, test, and adjust on the spot

699 products

Molex Connectors

Plugs, sockets, and housings for making Molex connections

24 products

Amphenol Sleeves

Combine with a wire to make a connection with a circuit board

2 products

Distribution Blocks

Distribute electricity from a single power source to several devices in a circuit

47 products

Terminal Adapters

Convert wire terminals from one connection type or gender to another

7 products

Slip Rings

Maintain an electrical link between a moving part and a stationary part

4 products

Terminal Splitters

Divide one male quick-disconnect connection into two

4 products

Distribution Bars

Route electricity within switchboards and battery banks; also known as bus bars

31 products

Distribution Posts

Send power from one source to several devices in a circuit in less space than a distribution block

4 products

Wire Splices

Connect wires end to end to extend or repair a run

17 products

Terminal and Splice Kits

Maintain a supply of extra terminals and splices to join and terminate wire

17 products

Battery Contacts

Add or replace contacts in battery holders and circuit boards

18 products

Battery Holders

Create an electrical connection between batteries and contacts to power equipment

60 products

Battery Springs

Replace springs in battery holders and contacts

8 products

Jumper Cables

Jump-start a dead battery

12 products

Jumper Cords

Ready to connect with a terminal at one or both ends

17 products

Battery Terminals

Connect cable to battery posts to power vehicles and machines

131 products

Grounding Lugs

Create a common grounding path for internal components and circuits, as well as the enclosure body

1 product

Fastening and Joining

Welding Lugs

Screw, hammer, or crimp on to secure welding cable connections

13 products

MIG Gun Contact Tips

Attach to MIG guns to guide welding wire and electric current to the weld site

17 products

MIG Gun Nozzles

Direct shielding gas towards welds and protect contact tips from molten metal

33 products

MIG Gun Gas Diffusers

Evenly distribute shielding gas for high-quality MIG welds

10 products

Rivets

Join materials together permanently, especially when too thin or fragile to fasten with screws

25 products

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

1 product

Lighting

Light Bulbs

Standard household, miniature, compact, tubular, and ultraviolet bulbs

110 products

Lubricating

Grease

Thicker than oil to evenly lubricate surfaces and stay in place

32 products

Antiseize Lubricants

Prevent threaded fasteners from sticking due to rust, dirt, and heat

31 products

Communication

Labels

Stick onto items to identify or convey information about them

1 product

Audible Alarms/Indicator Lights

Alert people with both light and sound

2 products

Audible Alarms

Everything from bells and whistles to horns and sirens

8 products

Power Transmission

Compression Springs

When squeezed, springs push back to their original length

108 products

Raw Materials

Gallium

Transfers heat and electricity as a safe alternative to mercury in thermometers and thermostats

2 products

Fabricating and Machining

Abrasive Blaster Safety Switches

Shut off abrasive blasters if the operator loses control; also known as deadman switches

11 products