ASTM A234 Pipe Caps | McMaster-Carr

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About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Fitting Type

Cap

Cover a pipe end to seal it

58 products

Plug

Insert into a pipe end to seal it

10 products

Threading

Threaded

Screw onto pipe and fittings with compatible threads and genders

10 products

Unthreaded

Weld pipe and fittings together or join with sealant

58 products

Low-Pressure Iron and Steel Butt-Weld Pipe Fittings

Achieve maximum flow in medium-pressure lines. These fittings have beveled ends that, when flush to pipe, form a trough to create strong, smooth welds. They’re also known as Schedule 40 fittings. Made of steel, they perform best in noncorrosive environments.

Caps

Butt Weld

	Construction	OD	Pipe Schedule	Material	Color		Each
Butt Weld



	1/2	Seamless	27/32"	40	Enamel-Coated Steel	Green	43425K116	000000


	3/4	Seamless	1 3/64"	40	Enamel-Coated Steel	Green	43425K126	00000
	1	Seamless	1 5/16"	40	Enamel-Coated Steel	Green	43425K136	00000
	1 1/4	Seamless	1 21/32"	40	Enamel-Coated Steel	Green	43425K146	00000
	1 1/2	Seamless	1 29/32"	40	Enamel-Coated Steel	Green	43425K156	00000
	2	Seamless	2 3/8"	40	Enamel-Coated Steel	Green	43425K166	00000
	2 1/2	Seamless	2 7/8"	40	Enamel-Coated Steel	Green	43425K176	00000
	3	Seamless	3 1/2"	40	Enamel-Coated Steel	Green	43425K186	00000
	4	Seamless	4 1/2"	40	Enamel-Coated Steel	Green	43425K216	00000
	6	Seamless	6 5/8"	40	Enamel-Coated Steel	Green	43425K236	00000
	8	Seamless	8 5/8"	40	Enamel-Coated Steel	Green	43425K246	000000


	10	Seamless	10 3/4"	40	Enamel-Coated Steel	Green	43425K256	000000

180° Bend Connectors

Image of Product. Front orientation. Pipe Traps. Low-Pressure Iron and Steel Butt-Weld Pipe Fittings.

180° bend connectors are also known as U-bends.

	Construction	Pipe Schedule	Material	Color	Shape		Each
Butt Weld



	3/4	Seamless	40	Enamel-Coated Steel	Green	180° Bend	43425K123	0000000


	1	Seamless	40	Steel	—	180° Bend	43425K133	000000
	1 1/4	Seamless	40	Steel	—	180° Bend	43425K143	000000
	1 1/2	Seamless	40	Steel	—	180° Bend	43425K153	000000
	2	Seamless	40	Steel	—	180° Bend	43425K163	000000
	2 1/2	Seamless	40	Steel	—	180° Bend	43425K173	000000
	3	Seamless	40	Steel	—	180° Bend	43425K183	000000
	4	Seamless	40	Steel	—	180° Bend	43425K213	000000
	6	Seamless	40	Steel	—	180° Bend	43425K233	000000

Stub-End Straight Adapters

Straight Adapter

Stub-end straight adapters are used with flanges. Slide a flange onto the stub end and weld the stub end to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily, which creates an access point for frequent cleaning and inspecting.

Pipe Size	Flange OD	Construction	Pipe Schedule	Finished Material		Each
1/2	1 3/8"	Seamless	40	Steel	43425K115	000000
3/4	1 11/16"	Seamless	40	Steel	43425K125	00000
1	2"	Seamless	40	Steel	43425K135	00000
1 1/4	2 1/2"	Seamless	40	Steel	43425K145	000000
1 1/2	2 7/8"	Seamless	40	Steel	43425K155	000000
2	3 5/8"	Seamless	40	Steel	43425K165	000000
2 1/2	4 1/8"	Seamless	40	Steel	43425K175	000000
3	5"	Seamless	40	Steel	43425K185	000000
4	6 3/16"	Seamless	40	Steel	43425K215	000000
6	8 1/2"	Seamless	40	Steel	43425K235	000000
8	10 5/8"	Seamless	40	Steel	43425K245	000000

High-Pressure Iron and Steel Butt-Weld Pipe Fittings

These fittings have thick walls for strength and butt-weld connections for maximum flow. When flush to pipe, the beveled ends form a trough to create strong, smooth welds. Fittings are made of steel and best for noncorrosive environments.

Caps

Butt Weld

	Construction	OD	Pipe Schedule	Material		Each
Butt Weld



	1/2	Seamless	27/32"	80	Steel	4981T43	000000


	3/4	Seamless	1 3/64"	80	Steel	4981T44	00000
	1	Seamless	1 5/16"	80	Steel	4981T45	00000
	1 1/4	Seamless	1 21/32"	80	Steel	4981T46	00000
	1 1/2	Seamless	1 29/32"	80	Steel	4981T47	00000
	2	Seamless	2 3/8"	80	Steel	4981T48	00000
	2 1/2	Seamless	2 7/8"	80	Steel	4981T49	00000
	3	Seamless	3 1/2"	80	Steel	4981T63	00000
	4	Seamless	4 1/2"	80	Steel	4981T64	00000
	6	Seamless	6 5/8"	80	Steel	4981T65	000000

180° Bend Connectors

Image of Product. Front orientation. Pipe Traps. High-Pressure Iron and Steel Butt-Weld Pipe Fittings.

180° bend connectors are also known as U-bends.

	Construction	Pipe Schedule	Material	Shape		Each
Butt Weld



	1 1/2	Seamless	80	Steel	180° Bend	4981T85	0000000


	2	Seamless	80	Steel	180° Bend	4981T86	000000
	2 1/2	Seamless	80	Steel	180° Bend	4981T87	000000
	3	Seamless	80	Steel	180° Bend	4981T88	000000
	4	Seamless	80	Steel	180° Bend	4981T89	000000
	6	Seamless	80	Steel	180° Bend	4981T67	000000

Stub-End Straight Adapters

Straight Adapter

Pipe Size	Flange OD	Construction	Pipe Schedule	Finished Material		Each
1/2	1 3/8"	Seamless	80	Steel	4981T211	000000
3/4	1 1/16"	Seamless	80	Steel	4981T221	00000
1	2"	Seamless	80	Steel	4981T231	00000
1 1/4	2 1/2"	Seamless	80	Steel	4981T241	000000
1 1/2	2 7/8"	Seamless	80	Steel	4981T251	000000
2	3 5/8"	Seamless	80	Steel	4981T261	000000
2 1/2	4 1/8"	Seamless	80	Steel	4981T271	000000
3	5"	Seamless	80	Steel	4981T281	000000
4	6 3/16"	Seamless	80	Steel	4981T291	000000
6	8 1/2"	Seamless	80	Steel	4981T321	000000

Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

Stronger than our low-pressure galvanized fittings, these resist rust in wet and outdoor environments.

Plugs

Male

Plugs are also known as bull plugs; the center is hollow, which allows fluid to put pressure on the threads for a tight seal.

	Construction	Pipe Schedule	Body Shape	Material		Each
NPT Male



	1/8	Hollow	80	Round	Galvanized Steel	1109T11	000000


	1/4	Hollow	80	Round	Galvanized Steel	1109T12	00000
	3/8	Hollow	80	Round	Galvanized Steel	1109T13	00000
	1 1/4	Hollow	80	Round	Galvanized Steel	1109T17	00000
	1 1/2	Hollow	80	Round	Galvanized Steel	1109T18	00000
	2	Hollow	80	Round	Galvanized Steel	1109T19	000000
	4	Hollow	80	Round	Galvanized Steel	1109T22	000000

External-Hex-Drive Plugs

Male

Plugs are also known as bull plugs; the center is hollow, which allows fluid to put pressure on the threads for a tight seal.

	Construction	Pipe Schedule	Body Shape	Material		Each
NPT Male



	1/2	Hollow	80	Hex	Galvanized Steel	1109T14	000000


	3/4	Hollow	80	Hex	Galvanized Steel	1109T15	00000
	1	Hollow	80	Hex	Galvanized Steel	1109T16	00000