ASTM A182 Pipe Plugs | McMaster-Carr

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304/304L Stainless Steel

316 Stainless Steel

316/316L Stainless Steel

Maximum Pressure @ Temperature

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Fitting Material

304 Stainless Steel

304/304L Stainless Steel

316 Stainless Steel

316/316L Stainless Steel

RoHS

Compliant

Not Compliant

Export Control Classification Number (ECCN)

2A992

2B999

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

Yes

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174 Products

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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

131 products

Plug

Insert into a pipe end to seal it

43 products

Fitting Type

Flange

Create an access point in your line for routine maintenance

65 products

Performance

Precision

The tightest tolerances of our threaded fittings

1 product

High-Pressure Stainless Steel Threaded Pipe Fittings

These fittings handle high-pressure flow up to 3,000 psi. Made of stainless steel, they have excellent corrosion resistance.

Caps

Female

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

				304 Stainless Steel				316 Stainless Steel
	Pipe Size	Dash Size	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Female



		1/8	02	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K581	000000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K681	000000


		1/4	04	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K582	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K682	00000
		3/8	06	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K583	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K683	00000
		1/2	08	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K584	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K684	00000
		3/4	12	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K585	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K685	00000
		1	16	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K586	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K686	00000
		1 1/4	20	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K587	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K687	00000
		1 1/2	24	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K588	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K688	000000
		2	32	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K589	000000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K689	000000
		2 1/2	40	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K181	000000	—	—	———	0
		3	48	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	45525K182	000000	—	—	———	0

External-Hex-Drive Plugs

Male

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

						304 Stainless Steel				316 Stainless Steel
	Pipe Size	Dash Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Male



		1/8	02	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K331	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K721	00000


		1/4	04	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K332	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K722	0000
		3/8	06	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K333	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K723	00000
		1/2	08	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K334	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K724	00000
		3/4	12	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K335	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K725	00000
		1	16	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K336	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K726	00000
		1 1/4	20	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K337	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K727	00000
		1 1/2	24	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K338	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K728	00000
		2	32	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K339	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K729	000000
		2 1/2	40	Solid	3000	Hex	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K184	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K221	000000
		3	48	Solid	3000	Hex	3,000 psi @ 72° F	300 psi @ 350° F	4464K189	000000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K222	000000

External-Square-Drive Plugs

Male

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

						304 Stainless Steel				316 Stainless Steel
	Pipe Size	Dash Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Male



		1/8	02	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K321	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K711	00000


		1/4	04	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K322	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K712	0000
		3/8	06	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K323	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K713	00000
		1/2	08	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K324	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K714	00000
		3/4	12	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K325	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K715	00000
		1	16	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K326	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K716	00000
		1 1/4	20	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K327	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K717	00000
		1 1/2	24	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K328	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K718	00000
		2	32	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K329	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K719	000000
		2 1/2	40	Solid	3000	Square	—	—	———	0	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K211	000000
		3	48	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K182	000000	—	—	———	0

Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings

Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines.

Hex-Drive Plugs

Male

				316 Stainless Steel
	Pipe Size	Dash Size	Lg., mm	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Male



		1/2	08	15.5	7,700 psi @ 72° F	7,700 psi @ 300° F	48805K938	000000

Medium-Pressure Stainless Steel Threaded Pipe Fittings

A step up in strength from our low-pressure pipe fittings, these handle up to 1,000 psi. They’re made of stainless steel for excellent corrosion resistance.

Caps

Female

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

			304 Stainless Steel				316 Stainless Steel
	Pipe Size	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Female



		1/8	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K84	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K451	00000


		1/4	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K85	0000	1,000 psi @ 72° F	650 psi @ 350° F	4452K452	0000
		3/8	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K86	0000	1,000 psi @ 72° F	650 psi @ 350° F	4452K453	0000
		1/2	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K87	0000	1,000 psi @ 72° F	650 psi @ 350° F	4452K454	00000
		3/4	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K88	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K455	00000
		1	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K89	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K456	00000
		1 1/4	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K91	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K457	00000
		1 1/2	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K92	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K458	00000
		2	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K93	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K459	00000
		2 1/2	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K164	00000	1,000 psi @ 72° F	650 psi @ 350° F	4452K634	000000
		3	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K165	000000	1,000 psi @ 72° F	650 psi @ 350° F	4452K635	000000


		4	1000	1,000 psi @ 72° F	650 psi @ 350° F	4464K166	000000	—	—	———	0

High-Pressure Stainless Steel Socket-Connect Pipe Fittings

Forged for excellent strength, these heavy duty fittings stand up to high-pressure applications. Slide pipe into the socket and weld for a permanent connection. Socket-connect fittings don’t require perfect alignment, so they’re easier to join than butt-weld fittings. Fittings are made of stainless steel for excellent corrosion resistance.

Caps

Female

304/304L Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

316/316L Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

				304/304L Stainless Steel				316/316L Stainless Steel
	Pipe Size	Dash Size	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
Socket Connect



		1/8	02	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K461	000000	—	—	———	0


		1/4	04	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K462	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K222	000000
		3/8	06	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K463	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K223	00000
		1/2	08	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K464	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K224	00000
		3/4	12	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K465	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K225	00000
		1	16	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K466	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K226	00000
		1 1/2	24	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K468	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K228	00000
		2	32	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K469	00000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K229	000000
		3	48	3000	2,500 psi @ 72° F	1,900 psi @ 350° F	44965K47	000000	3,000 psi @ 72° F	1,900 psi @ 350° F	45515K23	000000

Extreme-Pressure Stainless Steel Socket-Connect Pipe Fittings

The strongest socket-connect fittings we offer handle extreme-pressure applications. Also known as Pressure Class 6000, these fittings are made of forged stainless steel, which has excellent corrosion resistance. Slide pipe into the socket and weld for a permanent connection. Socket-connect fittings don’t require perfect alignment, so they’re easier to join than butt-weld fittings.

Caps

Socket Connect

304/304L Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

				304/304L Stainless Steel				316/316L Stainless Steel
	Pipe Size	Pressure Class	Pipe Schedule	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
Socket Connect



		1/2	6000	160	7,700 psi @ 72° F	6,500 psi @ 220° F	2064K33	000000	—	—	———	0


		3/4	6000	160	7,100 psi @ 72° F	5,900 psi @ 220° F	2064K34	00000	7,100 psi @ 72° F	5,900 psi @ 220° F	2077K34	000000
		1	6000	160	6,400 psi @ 72° F	5,300 psi @ 220° F	2064K35	00000	6,400 psi @ 72° F	5,300 psi @ 220° F	2077K35	000000
		2	6000	160	4,700 psi @ 72° F	3,900 psi @ 220° F	2064K37	000000	—	—	———	0

High-Pressure Stainless Steel Unthreaded Pipe Flanges

These heavy duty forged flanges create an access point in a high-pressure pipeline. Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (not included). Flanges are made of stainless steel for excellent corrosion resistance.

Forged Blind Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

304/304L Stainless Steel—Flanges hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

316/316L Stainless Steel—Flanges are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel flanges, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

						Bolt Hole						304/304L Stainless Steel		316/316L Stainless Steel
	Pipe Size	Dash Size	Flanged Connection Surface	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each		Each
Flanged



		1/2	08	Raised	3 3/4"	1/2"	0.62"	4	2 5/8"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N91	000000	1503N51	000000


		1/2	08	Raised	3 3/4"	1/2"	0.625"	4	2 5/8"	300	600 psi @ 72° F	300 psi @ 360° F	4448T275	00000	4452T285	00000
		3/4	12	Raised	4 5/8"	5/8"	0.75"	4	3 1/4"	300	600 psi @ 72° F	300 psi @ 360° F	4448T276	00000	4452T286	00000
		3/4	12	Raised	4 5/8"	5/8"	0.75"	4	3 1/4"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N92	00000	———	0
		1	16	Raised	4 7/8"	5/8"	0.75"	4	3 1/2"	300	600 psi @ 72° F	300 psi @ 360° F	4448T277	00000	4452T287	00000
		1	16	Raised	4 7/8"	5/8"	0.75"	4	3 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N93	00000	1503N53	000000
		1 1/4	20	Raised	5 1/4"	5/8"	0.75"	4	3 7/8"	300	600 psi @ 72° F	300 psi @ 360° F	4448T278	00000	4452T288	000000
		1 1/4	20	Raised	5 1/4"	5/8"	0.75"	4	3 7/8"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N94	000000	———	0
		1 1/2	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	300	600 psi @ 72° F	300 psi @ 360° F	4448T279	000000	4452T289	000000
		1 1/2	24	Raised	6 1/8"	3/4"	0.875"	4	4 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N95	000000	1503N55	000000
		2	32	Raised	6 1/2"	5/8"	0.75"	8	5"	300	600 psi @ 72° F	300 psi @ 360° F	4448T281	000000	4452T291	000000


		2	32	Raised	6 1/2"	5/8"	0.75"	8	5"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N96	000000	1503N56	000000
		2 1/2	40	Raised	7 1/2"	3/4"	0.875"	8	5 7/8"	300	600 psi @ 72° F	300 psi @ 360° F	4448T282	000000	4452T292	000000
		2 1/2	40	Raised	7 1/2"	3/4"	0.88"	8	5 7/8"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N97	000000	1503N57	000000
		3	48	Raised	8 1/4"	3/4"	0.875"	8	6 5/8"	300	600 psi @ 72° F	300 psi @ 360° F	4448T283	000000	4452T293	000000
		3	48	Raised	8 1/4"	3/4"	0.88"	8	6 5/8"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N98	000000	1503N58	000000
		4	64	Raised	10"	3/4"	0.875"	8	7 7/8"	300	600 psi @ 72° F	300 psi @ 360° F	4448T284	000000	4452T294	000000
		4	64	Raised	10 3/4"	7/8"	1"	8	8 1/2"	600	1,200 psi @ 72° F	840 psi @ 400° F	1538N99	000000	1503N59	000000
		6	96	Raised	12 1/2"	3/4"	0.875"	12	10 5/8"	300	600 psi @ 72° F	300 psi @ 360° F	4448T285	000000	4452T295	000000
		8	—	Raised	15"	7/8"	1"	12	13"	300	600 psi @ 72° F	300 psi @ 360° F	4448T48	000000	4452T116	000000
		10	—	Raised	17 1/2"	1"	1.12"	16	15 1/4"	300	600 psi @ 72° F	300 psi @ 360° F	4448T49	000000	———	0

Low-Pressure Stainless Steel Unthreaded Pipe Flanges

Create an access point in a low-pressure pipeline. Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (not included). Flanges are stainless steel for excellent corrosion resistance.

Forged Blind Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

304/304L Stainless Steel—Flanges hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

					Bolt Hole					304/304L Stainless Steel		316/316L Stainless Steel
	Pipe Size	Flanged Connection Surface	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Max. Pressure @ Temp.		Each		Each
Flanged



		1/2	Raised	3 1/2"	1/2"	5/8"	4	2 3/8"	150	230 psi @ 72° F	44685K162	000000	44695K152	000000


		3/4	Raised	3 7/8"	1/2"	5/8"	4	2 3/4"	150	230 psi @ 72° F	44685K163	00000	44695K153	00000
		1	Raised	4 1/4"	1/2"	5/8"	4	3 1/8"	150	230 psi @ 72° F	44685K164	00000	44695K154	00000
		1 1/4	Raised	4 5/8"	1/2"	5/8"	4	3 1/2"	150	230 psi @ 72° F	44685K165	00000	44695K155	00000
		1 1/2	Raised	5"	1/2"	5/8"	4	3 7/8"	150	230 psi @ 72° F	44685K166	00000	44695K156	00000
		2	Raised	6"	5/8"	3/4"	4	4 3/4"	150	230 psi @ 72° F	44685K167	00000	44695K157	000000
		2 1/2	Raised	7"	5/8"	3/4"	4	5 1/2"	150	230 psi @ 72° F	44685K168	000000	44695K158	000000
		3	Raised	7 1/2"	5/8"	3/4"	4	6"	150	230 psi @ 72° F	44685K169	000000	44695K159	000000
		4	Raised	9"	5/8"	3/4"	8	7 1/2"	150	230 psi @ 72° F	44685K171	000000	44695K161	000000
		6	Raised	11"	3/4"	7/8"	8	9 1/2"	150	230 psi @ 72° F	44685K172	000000	44695K162	000000
		8	Raised	13 1/2"	3/4"	7/8"	8	11 3/4"	150	230 psi @ 72° F	44685K177	000000	44695K167	000000


		10	Raised	16"	7/8"	1"	12	14 1/4"	150	230 psi @ 72° F	44685K328	000000	44695K257	000000
		12	Raised	19"	7/8"	1"	12	17"	150	230 psi @ 72° F	44685K329	000000	44695K258	000000