NPT Push-In Plugs | McMaster-Carr

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Tapered-Thread Pipe Fittings

Unthreaded Pipe Fittings

Performance

Flange Diameter

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Compliant

REACH

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Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

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Hardness

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Flange Standard

107 Products

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



	0.236" to 0.302"	1/8	5/16"-24	3/8"	150	Red	7/16"	100	4491K11	00000


	0.33" to 0.396"	3/8	—	3/8"	150	Red	17/32"	100	4491K41	0000
	0.419" to 0.485"	1/4	1/2"-20	3/8"	150	Red	5/8"	100	4491K141	0000
	0.471" to 0.547"	3/8	9/16"-18	7/16"	150	Red	11/16"	100	4491K146	0000
	0.58" to 0.667"	1/2	—	1/2"	150	Red	13/16"	100	4491K138	0000
	3/4" to 0.848"	3/4	7/8"-14	9/16"	150	Red	1"	100	4491K16	0000
	0.915" to 1.04"	3/4	1 1/16"-12	11/16"	150	Red	1 5/32"	100	4491K47	0000
	0.964" to 1.09"	1	—	3/4"	150	Red	1 1/4"	100	4491K14	0000
	1.312" to 1.465"	1 1/4	—	7/8"	150	Red	1 5/8"	100	4491K137	00000
	1.513" to 1.6"	1 1/4	1 5/8"-12	1/2"	150	Red	1 3/4"	100	4491K71	00000
	1.56" to 1.682"	1 1/2	—	3/4"	150	Red	1 7/8"	50	4491K144	00000


	1.975" to 2.132"	2	—	1"	150	Red	2 1/4"	50	4491K26	00000
	2.395" to 2.602"	2 1/2	—	1 1/32"	150	Red	2 13/16"	50	4491K139	00000
	2.975" to 3.103"	3	—	3/4"	150	Red	3 11/32"	25	4491K101	00000
	3.47" to 3.6"	3 1/2	—	3/4"	150	Red	3 7/8"	10	4491K94	0000
	4.02" to 4.14"	4	—	3/4"	150	Red	4 17/32"	10	4491K95	0000
	4.99" to 5.2"	5	—	1"	150	Red	5 5/8"	10	4491K96	00000
	7.97" to 8.14"	8	—	1"	150	Red	8 3/8"	5	4491K97	00000

Metal Round Caps

Tougher than plastic and rubber caps for best protection from impact and wear. These caps cover pipe ends to prevent damage and keep out dust and debris during shipping and storage.

Steel—The strongest caps, but moisture can cause them to rust.

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

18-8 Stainless Steel—Our most corrosion-resistant caps for parts exposed to moisture and the outdoors.

					Steel		Aluminum		18-8 Stainless Steel
For OD	For Pipe Size	Inside Ht.	Flexibility	Max. Temp.		Each		Each		Each
35/64"	1/4	7/16"	Rigid	Not Rated	9275K111	00000	9275K112	00000	9275K113	00000
43/64"	3/8	9/16"	Rigid	Not Rated	9275K121	0000	9275K122	0000	9275K123	0000
27/32"	1/2	7/16"	Rigid	Not Rated	9275K131	0000	9275K132	0000	9275K133	0000
1 3/64"	3/4	5/8"	Rigid	Not Rated	9275K151	0000	9275K152	0000	9275K153	0000
1 5/16"	1	11/16"	Rigid	Not Rated	9275K171	0000	9275K172	0000	9275K173	0000
1 21/32"	1 1/4	13/16"	Rigid	Not Rated	9275K191	0000	9275K192	0000	9275K193	0000
1 29/32"	1 1/2	15/16"	Rigid	Not Rated	9275K64	0000	9275K31	0000	9275K283	0000
2 3/8"	2	1 1/16"	Rigid	Not Rated	9275K65	0000	9275K32	0000	9275K293	0000
2 7/8"	2 1/2	1 3/8"	Rigid	Not Rated	9275K66	0000	9275K33	0000	9275K383	00000
3 1/2"	3	1 3/8"	Rigid	Not Rated	9275K67	0000	9275K34	00000	9275K393	00000
4"	3 1/2	1 1/2"	Rigid	Not Rated	9275K68	0000	9275K35	00000	9275K443	00000
4 1/2"	4	1 7/8"	Rigid	Not Rated	9275K69	0000	9275K36	00000	———	0
5 9/16"	5	1 7/8"	Rigid	Not Rated	9275K271	00000	9275K272	00000	———	0
6 5/8"	6	1 7/8"	Rigid	Not Rated	9275K71	00000	9275K37	00000	9275K463	00000

Adhesive-Back Caps for Pipe Flanges

Stick these caps onto the raised face of flanges to prevent nicks and scratches during shipping and storage. They stay in place until you peel them off and leave no residue behind.

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

	Max. Temp., ° F	Color	Adhesive Type	Pkg. Qty.		Pkg.
Polyethylene







	For ANSI Flanges

	1/2	1 3/8"	Rigid	160	Black	Rubber	20	3445T11	000000


	3/4	1 11/16"	Rigid	160	Black	Rubber	15	3445T12	00000
	1	2"	Rigid	160	Black	Rubber	15	3445T13	00000
	1 1/4	2 1/2"	Rigid	160	Black	Rubber	10	3445T14	00000
	1 1/2	2 7/8"	Rigid	160	Black	Rubber	10	3445T15	00000
	2	3 5/8"	Rigid	160	Black	Rubber	10	3445T16	00000
	2 1/2	4 1/8"	Rigid	160	Black	Rubber	6	3445T17	00000
	3	5"	Rigid	160	Black	Rubber	4	3445T18	00000
	3 1/2	5 1/2"	Rigid	160	Black	Rubber	4	3445T19	00000
	4	6 3/16"	Rigid	160	Black	Rubber	3	3445T21	00000
	5	7 5/16"	Rigid	160	Black	Rubber	3	3445T22	00000


	6	8 1/2"	Rigid	160	Black	Rubber	1	3445T23	00000
	8	10 5/8"	Rigid	160	Black	Rubber	1	3445T24	00000
	10	12 3/4"	Rigid	160	Black	Rubber	1	3445T25	00000
	12	15"	Rigid	160	Black	Rubber	1	3445T26	00000
	14	16 1/4"	Rigid	160	Black	Rubber	1	3445T27	00000
	16	18 1/2"	Rigid	160	Black	Rubber	1	3445T28	00000
	18	21"	Rigid	160	Black	Rubber	1	3445T29	00000
	20	23"	Rigid	160	Black	Rubber	1	3445T31	00000

Snap-On Caps for Pipe Flanges

Cap Installed

on ANSI Flange

For ANSI Flanges

For SAE Flanges

Align the tabs with the bolt holes and snap on for a perfect fit. These caps protect flange threads from damage, or mask them during painting and coating.

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

	Max. Temp., ° F	Color	For Bolt Hole Ctr.-to-Ctr.	Pkg. Qty.		Pkg.
Polyethylene







	For ANSI Flanges

	1/2	150	Rigid	175	Red	2 3/8"	10	4262N11	00000


	3/4	150	Rigid	175	Red	2 3/4"	10	4262N12	0000
	1	150	Rigid	175	Red	3 1/8"	10	4262N13	00000
	1 1/2	150	Rigid	175	Red	3 7/8"	10	4262N14	00000
	2	150	Rigid	175	Red	4 3/4"	10	4262N15	00000
	2 1/2	150	Rigid	175	Red	5 1/2"	1	4262N16	0000
	3	150	Rigid	175	Red	6"	1	4262N17	0000
	4	150	Rigid	175	Red	7 1/2"	1	4262N18	0000
	6	150	Rigid	175	Blue	9 5/8"	1	4262N311	0000




			For SAE Flanges

			1/2	3000	Rigid	175	Blue	0.69", 1 1/2"	10	7962N11	0000


			1/2	6000	Rigid	175	Red	0.72", 1.59"	10	7962N17	0000
			3/4	3000	Rigid	175	Blue	0.88", 1.88"	10	7962N12	00000
			3/4	6000	Rigid	175	Red	0.94", 2"	10	7962N18	0000
			1	3000	Rigid	175	Blue	1.03", 2.06"	10	7962N13	00000
			1	6000	Rigid	175	Red	1.09", 2 1/4"	10	7962N19	00000
			1 1/4	3000	Rigid	175	Blue	1.19", 2.31"	10	7962N14	00000
			1 1/4	6000	Rigid	175	Red	1 1/4", 2.63"	10	7962N21	00000
			1 1/2	3000	Rigid	175	Blue	1.41", 2 3/4"	10	7962N15	00000
			1 1/2	6000	Rigid	175	Red	1.44", 3.13"	10	7962N22	00000
			2	3000	Rigid	175	Blue	1.69", 3.06"	10	7962N16	00000


			2	6000	Rigid	175	Red	1 3/4", 3.81"	10	7962N23	00000

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



	0.487" to 0.568"	1/4	9/16"-18	15/32"	Flexible	150	Red	100	4491K44	00000


	1.249" to 1.402"	1	—	7/8"	Flexible	150	Red	100	4491K24	00000
	1.568" to 1.688"	1 1/4	—	3/4"	Flexible	150	Red	100	4491K34	00000
	1.781" to 1.938"	1 1/2	—	1"	Flexible	150	Red	50	4491K35	0000
	3.41" to 3.54"	3	—	3/4"	Flexible	150	Red	10	4491K112	0000
	3.94" to 4.07"	3 1/2	—	3/4"	Flexible	150	Red	25	4491K127	00000
	6.53" to 6.63"	6	—	1 1/2"	Flexible	150	Red	10	4491K114	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.

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



	3/16" to 1/4"	7/16"	150	Blue	3/4"	100	57935K21	000000


	2 29/64" to 2 1/2"	1/2"	150	Blue	3 1/16"	10	57935K28	0000