Screw Terminals | McMaster-Carr

	Number of Circuits Number of Circuits

	For Wire Gauge For Wire Gauge

28
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1/0
2/0
3/0
4/0
250 MCM
300 MCM
350 MCM
400 MCM
450 MCM
500 MCM
600 MCM
700 MCM
750 MCM
800 MCM
900 MCM
1000 MCM

	Mounting Location Mounting Location


Surface	DIN Rail

Enclosure	Circuit Board

Panel

	Wire Connection Type Wire Connection Type

Screw Terminals

Screw-Clamp Terminals

Twist On

Stud Terminals

	Maximum Voltage Maximum Voltage

	System of Measurement System of Measurement

Inch

Metric

	Width Width

	Length Length

	Height Height

	Current Per Circuit Current Per Circuit

	Color Color

	Black
	White
	Gray
	Blue
	Red
	Beige
	Yellow
	Orange
	Green
	Clear
	Green/Yellow
	Dark Blue
	Gray/Black
	Gray/Orange
	Gray/Red
	Gray/Yellow
	Light Blue

	Terminal Center-to-Center Terminal Center-to-Center

	Maximum Temperature Maximum Temperature

	Specifications Met Specifications Met

	Terminal Size Terminal Size

	Number of Mounting Holes Number of Mounting Holes

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Mounting Hole Center-to-Center Length Mounting Hole Center- to-Center Length

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	For Number of Wires For Number of Wires

	Type Type

	For Wire Material For Wire Material

Copper

Aluminum

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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715 Products

Terminal Blocks

Mount blocks to a panel or the surface of a machine. Also known as barrier terminal strips.

Space-Saver Terminal Blocks

A single row of terminals fits in narrow spaces.

Short-Resistant Terminal Blocks

Recessed screw terminals prevent you from accidentally connecting two circuits with a screwdriver or other tool, causing a short.

Short-Resistant Easy-Disconnect Terminal Blocks

Best for equipment requiring regular servicing, these blocks disconnect without having to remove any wiring thanks to their plug-and-socket design. Their recessed screws prevent shorts by reducing the risk you’ll connect two circuits with a screwdriver or other tool.

High-Temperature Short-Resistant Terminal Blocks

Made of ceramic, these blocks withstand high-temperature applications that reach up to 1110° F such as ovens and furnaces. They have recessed screws to reduce the chance you’ll cause a short by accidentally connecting two circuits with a screwdriver or other tool.

Modular DIN-Rail Mount Terminal Blocks

Use with DIN 3 rail. Add as many circuits as you need with these terminal blocks and accessories.

Modular Mini DIN-Rail Mount Terminal Blocks

Use with DIN 2 rail. Add as many circuits as you need with these terminal blocks and accessories.

Touch-Safe Terminal Blocks

Rated IP20, these blocks have recessed terminals to prevent accidental contact with live circuits.

Enclosure-Mounted Terminal Blocks

Save time when wiring connections in a junction box; these blocks come already installed in an enclosure.

Enclosure-Mounted Terminal
Blocks with See-Through Cover

Inspect the terminal block and wiring without opening the cover.

Circuit-Board-Mount Terminal Blocks

Solder the pins on these blocks directly to your circuit board.

Through-Panel Terminal Blocks

Blocks mount in a cutout and have terminals on both sides.

Harsh Environment High-Current Distribution Bars

Protect connections against corrosion.These bars are tin-plated copper and have stainless steel terminals.

Distribution Blocks

With the help of distribution blocks, you can take a high-current wire from your power source and connect it to one or more electrical devices.

High-Current Distribution Posts

Distribute up to 150 amps from the center stud terminal to the eight screw terminals around it.

Lugs

Set Screw Lugs

The straight tongue improves conductivity by increasing the surface contact between the lug and your equipment.

Set Screw Lugs with Offset

An offset tongue gives you extra space to insert wire.

Screw-Down Welding Lugs

Tighten the screw with a ¼" hex key wrench for a more secure connection than Hammer-On Welding Lugs.

Butt Splices

Noninsulated Screw-Down Butt Splices

Tighten the screws to connect wires.

Insulated Screw-Down Butt Splices

A plastic cover fully insulates these splices and it's clear so you can visually confirm the connection.

Harsh-Environment Screw-Down Butt Splices

Join wires and cables in some of the dirtiest and wettest locations—from paper mills to marine environments—without special tools.

Underground Heat-Shrink Screw-Down Butt Splices

Make watertight connections for underground applications.

Twist-On No-Crimp Butt Splices

Insert wires and twist on the threaded end caps. The caps lock wires into place, making these splices a good choice for high-vibration applications.

Weather-Resistant Twist-On No-Crimp Butt Splices

Sealed threads make these splices weather resistant.

Multi-Way Taps/Splices

Tap and splice multiple wires together at the same time.

Sealed Multi-Way Taps/Splices

Tap and splice multiple wires in temporarily wet environments and up to six feet underground.

Twist-On Wire Splicing Connectors

Make a quick, secure wire connection without crimping.

Ultra-High Temperature Twist-On
Wire Splicing Connectors

Made of porcelain, these connectors can withstand temperatures up to 1200°F.

Watertight Twist-On Wire Splicing Connectors

Filled with silicone, these connectors seal out moisture and prevent corrosion.

High Temperature Twist-On Wire Splicing Connectors

Rated to 300° F, these connectors are an excellent choice for use in high-temperature applications such as HID lighting and electric heat.

Space-Saver Twist-On Wire Splicing Connectors

Suitable for use in tight spaces, these connectors have a narrow profile that takes up less space than standard wire splicing connectors.

Easy-Grip Twist-On Wire Splicing Connectors

Underground Easy-Grip Twist-On
Wire Splicing Connectors

Suitable for use underground, these connectors consist of a twist-on wire connector and an abrasion- and moisture-resistant insulator tube.

Wide-Range Easy-Grip Twist-On
Wire Splicing Connectors

Large enough to be used with a wide range of wire sizes, these connectors can still fit into cramped outlet boxes.

Padded Easy-Grip Twist-On Wire Splicing Connectors

Soft molding over the wings provides a comfortable grip.

Easy-Grip Twist-On Wire Splicing Connectors

Grip the wings on these connectors to increase leverage when tightening.

Grounding Lugs for Enclosures

Create a common grounding path for not only internal components and circuits, but also your enclosure’s body.

Temperature and Humidity Monitoring

Terminal Blocks for Thermocouple Wire

Connect thermocouples to extension wire or instrumentation.