Underground Terminals | McMaster-Carr

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20 Products

Screw-Down Split-Bolt Splices

Splice large wire sizes without special tools—insert your wires and tighten the hex nut to make a connection. The hex nut can be loosened to disconnect if needed.

For technical drawings and 3-D models, click on a part number.

For Copper Wire
For Wire Gauge	For Wire Type	For Min. Tap Wire Gauge	For Min. Tap Wire Type	Wire Slot Wd.	Head Wd.	Terminal Material	Max. Voltage	Max. Temperature, °F	Specifications Met		Each
16-8	Stranded, Weld Wire	16	Stranded	0.15"	0.38"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	00000
10-6	Solid, Weld Wire	16	Solid	0.17"	0.5"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	0000
8-4	Solid, Weld Wire	16	Solid	0.22"	0.56"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	0000
6-2	Solid, Stranded, Weld Wire	14	Stranded	0.33"	0.69"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	0000
6-2	Solid, Weld Wire	12	Solid	0.33"	0.69"	Copper	600V AC	190°	UL Listed, CSA Certified	00000000	0000
4-1/0	Solid, Stranded, Weld Wire	14	Solid	0.38"	0.75"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	0000
2-2/0	Solid, Stranded, Weld Wire	14	Stranded	0.42"	0.81"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	00000
2-3/0	Solid, Stranded, Weld Wire	12	Solid	0.47"	0.88"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	00000
1/0-250 MCM	Solid, Weld Wire	10	Solid	0.58"	1"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	00000
4/0-350 MCM	Stranded, Weld Wire	8	Solid	0.75"	1.5"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	00000
250-500 MCM	Weld Wire	8	Solid	0.83"	1.63"	Copper	600V AC	190°	UL Listed, CSA Certified	0000000	00000

Underground Heat-Shrink Screw-Down Butt Splices

For 1 Wire

For 3 Wires/UF Cable

Make watertight connections for underground applications. These splices are abrasion-resistant and can withstand burial in rocky soil. They come with a length of heavy-wall polyolefin heat-shrink tubing that fits over the splice. Tighten the screws to connect wires.

For Number of Wires	For Cable Industry Designation	For Number of Ground Wires	For Wire Gauge	For Wire Type	For Wire Material	Insulation Material	Terminal Material	Shrink Temperature, °F	Max. Voltage	Max. Temperature, °F	Specifications Met	Includes		Each
1	__	__	8-2	Solid, Stranded	Aluminum, Copper	Polyolefin Plastic	Tin-Plated Aluminum	250°	600V AC	190°	UL Listed	2" and 5" lengths of heat-shrink tubing	0000000	000000
3	UF	1	14-8	Solid, Stranded	Copper	Polyolefin Plastic	Tin-Plated Copper	250°	600V AC	190°	UL Listed	8" length of heat-shrink tubing	0000000	00000

Underground Twist-On Wire Splicing Connectors

Make quick, watertight connections for underground applications without any crimping. These connectors are filled with silicone, so they seal out moisture and prevent corrosion. Because you twist to connect wire by hand, they're ideal for jobs where you don’t want to carry around a lot of tools.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Min. Wire Combination	Max. Wire Combination	For Wire Type	Color	Insulation Material	Terminal Material	Max. Underground Voltage	Max. Voltage	Max. Temp., °F	Specifications Met	Pkg. Qty.		Pkg.
22-12	Two 20-ga. Wires with One 22-ga. Wire	Two 14-ga. Wires with One 18-ga. Wire	Solid, Stranded	Gray	Polypropylene Plastic	Zinc-Plated Steel	30V AC 30V DC	600V AC	220°	UL Listed, CSA Certified	20	00000000	000000
22-8	Three 16-ga. Wires with One 22-ga. Wire	One 8-ga. Wire with One 12-ga. Wire	Solid, Stranded	Light Blue	Polypropylene Plastic	Zinc-Plated Steel	30V AC 30V DC	600V AC	220°	UL Listed, CSA Certified	2	00000000	0000
20-12	Three 20-ga. Wires	Three 12-ga. Wires	Solid, Stranded	Dark Blue	Polypropylene Plastic	Zinc-Plated Steel	30V AC 30V DC	600V AC	220°	UL Listed	20	00000000	00000
18-10	Four 18-ga. Wires	Three 10-ga. Wires	Solid, Stranded	Yellow	Polypropylene Plastic	Zinc-Plated Steel	30V AC 30V DC	600V AC	220°	UL Listed, CSA Certified	10	00000000	00000
14-10	Two 14-ga. Wires	Two 10-ga. Wires with Two 14-ga. Wires	Solid, Stranded	Red	Polypropylene Plastic	Zinc-Plated Steel	30V AC 30V DC	600V AC	220°	UL Listed, CSA Certified	10	00000000	00000
14-6	Four 14-ga. Wires	One 6-ga. Wire with One 8-ga. Wire	Solid, Stranded	Dark Blue	Polypropylene Plastic	Zinc-Plated Steel	30V AC 30V DC	600V AC	220°	UL Listed, CSA Certified	2	00000000	0000

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. The tube is filled with grease that acts as a sealant. Use these connectors to make quick, secure wire connections without crimping.

For Wire Gauge	Min. Wire Combination	Max. Wire Combination	For Wire Type	Color	Insulation Material	Terminal Material	Max. Voltage	Max. Temperature, °F	Specifications Met	Pkg. Qty.		Pkg.
18-10	Two 18-ga. Wires	Three 10-ga. Wires	Solid, Stranded	Red, Yellow	Polypropylene Plastic/Rubber Blend	Tin-Plated Steel	600V AC	120°	UL Listed	2	0000000	000000