1 1/16"-12 Inserts | McMaster-Carr

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12 Products

Screw-In Plugs for Pipe and Tubing

Threaded for the most secure fit on female pipe and fittings. These plugs protect from damage during shipping and storage. They also keep dust, paint, and coatings from blocking holes and threads.

For Straight-Thread Fittings

Image of Product. Front orientation. Contains Annotated. Protective Plugs. Screw In, For Round Holes, For Pipe, For Round Shapes, For Straight-Thread Fittings, Polyethylene.

Polyethylene

Aluminum

Polyethylene—A balance of wear and chemical resistance for use in a variety of environments. These plugs withstand scratches and scrapes as well as mild acids, solvents, and chemical cleaners.

Aluminum—Withstand the highest temperatures of all our pipe and tubing plugs. They’re more wear resistant than plastic but won’t hold up as well to chemicals.

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



		1 1/16"-12	UN	—	5/8"	160	Red	50	1277K76	000000


		Aluminum



				1 1/16"-12	UN	3/4"	15/32"	650	—	25	3438T25	00000

For 37° Flared Tube

Polyethylene

Image of Product. Front orientation. Contains Annotated. Protective Plugs. Screw In, For Round Holes, For Pipe, For Round Shapes, For 37° Flared Tube, Aluminum.

Aluminum

Polyethylene—A balance of wear and chemical resistance for use in a variety of environments. These plugs withstand scratches and scrapes as well as mild acids, solvents, and chemical cleaners.

Aluminum—Withstand the highest temperatures of all our pipe and tubing plugs. They’re more wear resistant than plastic but won’t hold up as well to chemicals.

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



		1 1/16"-12	UNS	3/4"	7/8"	150	Red	100	1277K42	000000


		Aluminum



				1 1/16"-12	UN	3/4"	21/32"	650	—	25	3438T41	00000

Pull-Tab-Release Hollow Plugs

Lift and pull the tabs with your fingers for easier removal than other plugs. With a tapered profile, these fit a range of diameters. Use to mask holes from coatings or protect threads during shipping.

Polyethylene—Convenient and economical. Instead of cleaning and reusing, just toss and grab a new plug.

	For Thread Size	Ht.	Max. Temp., ° F	Color	Ring Dia.	Pkg. Qty.		Pkg.
Polyethylene



	61/64" to 1 3/64"	1 1/16"-12	1/2"	150	Blue	1 3/8"	100	57935K27	000000

Hollow Plugs

With a hollow construction, these plugs compress for snug fit. Push into threaded and unthreaded holes to mask parts during coating and finishing. When you’re done, grab and pull the flanged edge to remove.

Vinyl Plastic—Durable to resist ripping or shredding, even with repeated use. They also hold up to oils, mild acids, and solvents.

	For Pipe Size	For Thread Size	Ht.	Max. Temp., ° F	Color	Flange Dia.	Pkg. Qty.		Pkg.
Vinyl Plastic



	1.04"	3/4	1 1/16"-12	11/16"	180	Red	1 5/16"	100	9343K19	000000

Hollow Tapered Plugs

A hollow construction makes these plugs extra flexible, so they compress for easy installation and a snug fit. The tapered profile fits a range of hole diameters. If you flip the plug over, it can be used as a cap.

Polyethylene—Convenient and economical. Instead of cleaning and reusing, just toss and grab a new plug.

	For Pipe Size	For Thread Size	Ht.	Max. Temp., ° F	Color	Flange Dia.	Pkg. Qty.		Pkg.
Polyethylene



	0.915" to 1.04"	3/4	1 1/16"-12	11/16"	150	Red	1 5/32"	100	4491K47	00000

Squeeze-Release Caps

The quickest caps to remove, these release instantly with a pinch of your fingers. They are commonly used to protect threads during shipping and storage or mask against paint and coatings.

Vinyl Plastic—A good all-around choice, these durable caps won’t rip or shred, even with repeated use. They also hold up to oils, mild acids, and solvents. Caps are flexible and conform to parts for a tight fit.

	For Thread Size	Inside Ht.	Flexibility	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Vinyl Plastic



	0.893"	1 1/16"-12	5/8"	Flexible	180	Red	100	9343K59	000000

Tapered Caps

Don't worry about having the exact size you need on hand. These caps are shaped to fit a range of ODs—just keep pushing on until they're snug. Because they make less contact with the parts they cover, they’re easier to remove than straight caps. In a pinch, you can flip tapered caps over and use them as plugs.

Polyethylene—Convenient and economical, these flexible caps are one and done. Instead of cleaning and reusing, just toss and grab a new cap.

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



	0.933" to 1.083"	3/4	1 1/16"-12	3/4"	Flexible	150	Red	100	4491K56	00000

Tear-Tab Caps

Once you snap these caps onto threaded fittings, they stay securely in place until you rip off the tab. A groove inside the cap locks onto the end thread, so dust and coatings can't get inside the fitting.

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	Color	Pkg. Qty.		Pkg.
Polyethylene



	1.053"	1 1/16"-12	27/32"	Rigid	150	Clear	10	6833K47	00000

Screw-On Caps


Polyethylene	Aluminum

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.

Aluminum—Use aluminum caps instead of steel to prevent corrosion from spreading to aluminum pipe and tubing.

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





				For Straight-Thread Fittings

				1 1/16"-12	UN	1 1/16"	3/4"	Rigid	150	Red	—	100	1277K32	000000


				Aluminum





								For Straight-Thread Fittings

								1 1/16"-12	UN	1 1/16"	49/64"	Rigid	650	—	MIL-C-5501/3	25	3522T19	00000