1 1/4"-18 Inserts | McMaster-Carr

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5 Products

Screw-On Caps

Polyethylene

Thread onto male pipe and fittings for the most secure fit. These caps keep dust, paint, and coatings out of threads and pipe. They also protect from damage during manufacturing, shipping, and storage.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	Thread
	Size	Type	For OD	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Polyethylene







				For Straight-Thread Fittings

				1 1/4"-18	UNEF	1 1/4"	15/32"	Rigid	150	Red	100	1277K125	000000

Conductive Plugs

Shield electrical connectors from interference and static while keeping out dust. These plugs have a surface resistivity of less than 10⁵ ohms/sq. to block stray signals from nearby equipment. They also dissipate static charges much more quickly than antistatic plugs. Use them to protect threaded and unthreaded connectors during shipping and storage.

Polyethylene—Hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Ht.	Head Dia.	Max. Surface Resistivity, ohm/sq.	Max. Temp., ° F	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	1 7/32"	1 1/4"-18	5/8"	1 1/2"	1× 10^5	140	Black	MIL-PRF-81705	25	94075K57	000000

Antistatic Caps

Protect sensitive electronics with caps that prevent static buildup and keep dust out of connections. They have a surface resistivity of less than 10¹² ohms/sq. for packaging and storing components such as semiconductors and resistors. Caps fit threaded and unthreaded electrical connectors.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Inside Ht.	Flexibility	Max. Temp., ° F	Max. Surface Resistivity, ohm/sq.	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	1.231"	1 1/4"-18	9/16"	Rigid	140	1× 10^12	Pink	MIL-PRF-81705	50	94075K38	000000

Antistatic Plugs

Protect sensitive electronics with plugs that prevent static buildup and keep dust out of connections. They have a surface resistivity of less than 10¹² ohms/sq. for packaging and storing components such as semiconductors and resistors. Plugs fit threaded and unthreaded electrical connectors.

Polyethylene—Hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Ht.	Head Dia.	Max. Surface Resistivity, ohm/sq.	Max. Temp., ° F	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	1 5/32"	1 1/4"-18	5/8"	1 7/16"	1× 10^12	140	Pink	MIL-PRF-81705	50	94075K77	000000

Conductive Caps

Shield electrical connectors from interference and static while keeping out dust. These caps have a surface resistivity of less than 10⁵ ohms/sq. to block stray signals and dissipate static charges much more quickly than antistatic caps. They protect threaded and unthreaded connectors during shipping and storage.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

	For Thread Size	Inside Ht.	Flexibility	Max. Temp., ° F	Max. Surface Resistivity, ohm/sq.	Color	Mil. Spec.	Pkg. Qty.		Pkg.
Polyethylene



	1.244"	1 1/4"-18	9/16"	Rigid	140	1× 10^5	Black	MIL-PRF-81705	25	94075K18	000000