ASTM A479 Pipe Plugs | McMaster-Carr

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Fluoroelastomer

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316 Stainless Steel

316/316L Stainless Steel

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316/316L Stainless Steel

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REACH

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

Yes

Export Control Classification Number (ECCN)

2B999

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51 Products

About Pipe and Fittings

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

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines.

Hex-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

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.

			316 Stainless Steel
	Pipe Size	Dash Size	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPTF Male



		1/8	02	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K176	000000


		1/4	04	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K177	00000
		3/8	06	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K178	00000
		1/2	08	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K179	00000
		3/4	12	6,600 psi @ 72° F	6,600 psi @ 300° F	51205K181	00000
		1	16	5,300 psi @ 72° F	5,300 psi @ 300° F	51205K208	00000

External-Hex-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

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



		1/8	02	Solid	Hex	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K392	000000


		1/4	04	Hollow	Hex	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K391	00000
		3/8	06	Hollow	Hex	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K393	00000
		1/2	08	Hollow	Hex	7,200 psi @ 72° F	7,200 psi @ 300° F	51205K395	00000
		3/4	12	Hollow	Hex	6,600 psi @ 72° F	6,600 psi @ 300° F	51205K396	00000
		1	16	Hollow	Hex	5,400 psi @ 72° F	5,400 psi @ 300° F	51205K425	00000

External-Hex-Drive Plugs with Gasket

Male

UN/UNF (SAE Straight) Thread—Also known as O-ring boss threads.

Fluoroelastomer—These gaskets resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol.

						316 Stainless Steel
	Thread Size	Dash Size	Construction	Body Shape	Gasket Material	Max. Pressure @ Temp.		Each
UN/UNF (SAE Straight) Male



		3/8"-24	03	Hollow	Hex	Fluoroelastomer	9,000 psi @ 72° F	51205K286	000000


		7/16"-20	04	Hollow	Hex	Fluoroelastomer	9,000 psi @ 72° F	51205K287	00000
		1/2"-20	05	Hollow	Hex	Fluoroelastomer	7,200 psi @ 72° F	51205K288	00000
		9/16"-18	06	Hollow	Hex	Fluoroelastomer	7,200 psi @ 72° F	51205K289	00000
		3/4"-16	08	Hollow	Hex	Fluoroelastomer	7,200 psi @ 72° F	51205K291	00000
		7/8"-14	10	Hollow	Hex	Fluoroelastomer	7,200 psi @ 72° F	51205K292	00000
		1 1/16"-12	12	Hollow	Hex	Fluoroelastomer	7,200 psi @ 72° F	51205K293	00000
		1 5/16"-12	16	Hollow	Hex	Fluoroelastomer	6,600 psi @ 72° F	51205K294	000000

Locknuts

					303 Stainless Steel
	Pipe Size	Dash Size	Gasket Material	Max. Pressure @ Temp.		Each
NPT Female



		1/8	02	PTFE	10,000 psi @ 72° F	5530K37	000000


		1/4	04	PTFE	10,000 psi @ 72° F	5530K38	00000
		3/8	06	PTFE	10,000 psi @ 72° F	5530K39	00000
		1/2	08	PTFE	10,000 psi @ 72° F	5530K44	00000
		3/4	12	PTFE	5,000 psi @ 72° F	5530K45	000000
		1	16	PTFE	5,000 psi @ 72° F	5530K46	000000

Premium Low-Pressure Stainless Steel Threaded Pipe Fittings

Unlike other stainless steel fittings, these are cast in the U.S. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except plugs adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems. These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Hex-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

			316 Stainless Steel
	Pipe Size	Pressure Class	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPTF Male



		1/4	150	270 psi @ 72° F	150 psi @ 350° F	5288N45	00000


		3/8	150	270 psi @ 72° F	150 psi @ 350° F	5288N46	0000
		1/2	150	270 psi @ 72° F	150 psi @ 350° F	5288N47	0000
		3/4	150	270 psi @ 72° F	150 psi @ 350° F	5288N48	00000
		1	150	270 psi @ 72° F	150 psi @ 350° F	5288N49	00000
		1 1/4	150	270 psi @ 72° F	150 psi @ 350° F	5288N51	00000
		1 1/2	150	270 psi @ 72° F	150 psi @ 350° F	5288N52	00000
		2	150	270 psi @ 72° F	150 psi @ 350° F	5288N53	00000

External-Hex-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

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



		1/4	Solid	150	Hex	270 psi @ 72° F	150 psi @ 350° F	5288N36	00000


		3/8	Solid	150	Hex	270 psi @ 72° F	150 psi @ 350° F	5288N37	0000

External-Square-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

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



		1/4	Solid	150	Square	270 psi @ 72° F	150 psi @ 350° F	5288N27	00000


		3/8	Solid	150	Square	270 psi @ 72° F	150 psi @ 350° F	5288N28	0000

Premium Medium-Pressure Stainless Steel Threaded Pipe Fittings

Unlike other stainless steel fittings, these are cast in the U.S. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 1000 medium-pressure stainless steel fittings. These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

External-Hex-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

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



		1/2	Solid	1000	Hex	1,000 psi @ 72° F	650 psi @ 350° F	5288N38	000000


		3/4	Solid	1000	Hex	1,000 psi @ 72° F	650 psi @ 350° F	5288N39	00000
		1	Solid	1000	Hex	1,000 psi @ 72° F	650 psi @ 350° F	5288N41	00000
		1 1/4	Solid	1000	Hex	1,000 psi @ 72° F	650 psi @ 350° F	5288N42	00000
		1 1/2	Solid	1000	Hex	1,000 psi @ 72° F	650 psi @ 350° F	5288N43	00000
		2	Solid	1000	Hex	1,000 psi @ 72° F	650 psi @ 350° F	5288N44	00000

External-Square-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

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



		1/2	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N29	000000


		3/4	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N31	00000
		1	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N32	00000
		1 1/4	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N33	00000
		1 1/2	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N34	00000
		2	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N35	00000

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	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Male



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