Set Screw Butt Splices | McMaster-Carr

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15 Products

Noninsulated Screw-Down Butt Splices

Tighten the screws to connect wires.

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

For Wire Gauge	Lg.	For Wire Material	Terminal Material	Max. Voltage	Max. Temperature, °F	Specifications Met		Each
14-2	1.19"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	00000
14-1/0	1.91"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	00000
4-500 MCM	3.88"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	00000
6-250 MCM	2.31"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	00000
10-350 MCM	2.46"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	00000
250-750 MCM	5.44"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	00000
500-1000 MCM	8.69"	Aluminum, Copper	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	0000000	000000

Insulated Screw-Down Butt Splices

A plastic cover fully insulates these splices and it's clear so you can visually confirm the connection. The tip can be trimmed to fit wire size. Wings on the cover have holes so that you can use the included cable tie to secure the cover to the wire. Tighten the screws to connect wires.

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

For Wire Gauge	Lg.	Color	For Wire Material	Insulation Material	Terminal Material	Max. Voltage	Max. Temperature, °F	Specifications Met		Each
14-2	3.83"	Clear	Aluminum, Copper	PVC Plastic	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	000000	000000
14-1/0	4.8"	Clear	Aluminum, Copper	PVC Plastic	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	000000	00000
10-350 MCM	7.91"	Clear	Aluminum, Copper	PVC Plastic	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	000000	00000
6-250 MCM	7.91"	Clear	Aluminum, Copper	PVC Plastic	Tin-Plated Aluminum	600V AC	190°	UL Listed, CSA Certified	000000	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

Harsh-Environment Screw-Down Butt Splices

Splice for Four Wires

Splice for Eight Wires

Join wires and cables in some of the dirtiest and wettest locations—from paper mills to marine environments—without special tools. With a nylon body and gasketed end caps, these splices are IP68 rated to seal out dust and water even if briefly submersed. To install, insert wire into either side, tighten the screws with a slotted screwdriver, and twist on the end caps to seal. They have multiple terminals, so you can repair, extend, and reconfigure cables with multiple wires.

For Number of Wires	For Wire Gauge	Lg.	Color	For Wire Type	For Wire Material	Insulation Material	Terminal Material	Max. Voltage	Max. Temp., °F		Each
4	18-14	3.417"	Black	Stranded	Aluminum, Copper	Nylon Plastic	Nickel-Plated Brass	450V AC	221°	0000000	000000
8	26-18	2.83"	Black	Stranded	Aluminum, Copper	Nylon Plastic	Nickel-Plated Brass	130V DC 130V AC	185°	0000000	00000