Shoulder Plugs | McMaster-Carr

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Maximum Pressure @ Temperature

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Compliant with Exemptions

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

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Hollow

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Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

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105 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 Iron and Steel Threaded Pipe Fittings

The strongest steel fittings we offer, these can withstand extreme-pressure applications.

Note: The maximum pressure listed for Class 6000 fittings is for conditions where there are no sudden changes in pressure or velocity. Please refer to ASME B16.11 to determine the specific maximum operating pressure for your application.

External-Hex-Drive Plugs with Gasket

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

Zinc-Plated Steel—Zinc-plated steel fittings have better corrosion resistance than plain steel fittings.

	Thread Size	Dash Size	Construction	Body Shape	Material	Max. Pressure @ Temp.	Gasket Material		Each
BSPP Male
Male


	1/8	—	02	Hollow	Hex	Zinc-Plated Steel	3,500 psi @ 72° F	Buna-N	4936K176	00000


	1/8	—	02	Hollow	Hex	Zinc-Plated Steel	5,000 psi @ 72° F	Buna-N	4936K883	0000
	1/4	—	04	Hollow	Hex	Zinc-Plated Steel	3,500 psi @ 72° F	Buna-N	4936K177	0000
	3/8	—	06	Hollow	Hex	Zinc-Plated Steel	3,500 psi @ 72° F	Buna-N	4936K178	0000
	1/2	—	08	Hollow	Hex	Zinc-Plated Steel	3,500 psi @ 72° F	Buna-N	4936K179	0000
	5/8	—	—	Hollow	Hex	Zinc-Plated Steel	3,500 psi @ 72° F	Buna-N	4936K181	0000
	3/4	—	12	Hollow	Hex	Zinc-Plated Steel	3,000 psi @ 72° F	Buna-N	4936K182	0000
	1	—	16	Hollow	Hex	Zinc-Plated Steel	3,000 psi @ 72° F	Buna-N	4936K449	00000


	UN/UNF (SAE Straight) Male
	Male


			—	5/16"-24	02	Hollow	Hex	Zinc-Plated Steel	7,500 psi @ 72° F	Buna-N	50925K336	0000


			—	3/8"-24	03	Hollow	Hex	Zinc-Plated Steel	7,500 psi @ 72° F	Buna-N	50925K337	0000
			—	7/16"-20	04	Hollow	Hex	Zinc-Plated Steel	7,500 psi @ 72° F	Buna-N	50925K411	0000
			—	1/2"-20	05	Hollow	Hex	Zinc-Plated Steel	6,000 psi @ 72° F	Buna-N	50925K413	0000
			—	9/16"-18	06	Hollow	Hex	Zinc-Plated Steel	6,000 psi @ 72° F	Buna-N	50925K415	0000
			—	3/4"-16	08	Hollow	Hex	Zinc-Plated Steel	6,000 psi @ 72° F	Buna-N	50925K417	0000
			—	7/8"-14	10	Hollow	Hex	Zinc-Plated Steel	6,000 psi @ 72° F	Buna-N	50925K419	0000
			—	1 1/16"-12	12	Hollow	Hex	Zinc-Plated Steel	6,000 psi @ 72° F	Buna-N	50925K422	0000
			—	1 3/16"-12	14	Hollow	Hex	Zinc-Plated Steel	5,500 psi @ 72° F	Buna-N	50925K424	00000
			—	1 5/16"-12	16	Hollow	Hex	Zinc-Plated Steel	5,500 psi @ 72° F	Buna-N	50925K425	0000


			Metric Male
			Male


					—	M10 × 1 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K675	0000


					—	M12 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K889	0000
					—	M14 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K891	0000
					—	M16 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K892	0000
					—	M18 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K893	0000
					—	M20 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K894	00000
					—	M22 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K895	00000
					—	M24 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K896	00000
					—	M26 × 1.5 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K897	00000
					—	M30 × 2 mm	—	Solid	Hex	Zinc-Plated Steel	5,600 psi @ 72° F	Buna-N	4936K898	00000

Replacement Washers

	For Thread Size	ID, mm	OD, mm	Thk., mm		Each
For BSPP Male



	1/8	—	8.56	15.88	2	4936K661	00000


	1/4	—	11.45	20.57	2.03	4936K662	0000
	3/8	—	14.96	23.8	2	4936K633	0000
	1/2	—	18.64	28.58	2.5	4936K634	0000
	5/8	—	20.6	31.75	2.5	4936K635	0000
	3/4	—	24.13	34.93	2.5	4936K636	0000
	1	—	30.3	42.8	3.2	4936K663	0000


	For Metric Male



			—	M10	8.56	15.88	2	4936K647	0000


			—	M12	9.73	18	1.5	4936K648	0000
			—	M14	11.38	21	1.5	4936K649	0000
			—	M16	13.41	24	1.5	4936K651	0000
			—	M18	14.76	26	1.5	4936K652	0000
			—	M20	16.76	28	1.5	4936K653	0000
			—	M22	18.74	30	2	4936K654	0000
			—	M24	20.11	32	2	4936K655	0000
			—	M26	24.13	34.93	2.5	4936K656	0000
			—	M30	25.7	39	2	4936K658	0000

High-Pressure Brass and Bronze Threaded Pipe Fittings

High pressures are no problem for these heavy-duty fittings. They are brass for good corrosion resistance.

Slotted-Drive Plugs with Gasket

Male

	Construction	Body Shape	Material	Max. Pressure @ Temp.	Gasket Material		Each
Metric Male



	M5 × 0.8 mm	Hollow	Hex	Brass	1,000 psi @ 72° F	Nylon	50785K824	00000

External-Hex-Drive Plugs with Gasket

Male

	Construction	Body Shape	Material	Max. Pressure @ Temp.	Gasket Material		Each
BSPP Male



	1/8	Solid	Hex	Brass	1,000 psi @ 72° F	Nylon	50785K812	00000


	1/4	Hollow	Hex	Brass	1,000 psi @ 72° F	Nylon	50785K813	0000
	3/8	Hollow	Hex	Brass	1,000 psi @ 72° F	Nylon	50785K823	00000
	1/2	Hollow	Hex	Brass	1,000 psi @ 72° F	Nylon	50785K826	00000

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.

External-Hex-Drive Plugs with Gasket

Male

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

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

							316 Stainless Steel
	Pipe Size	Thread Size	Dash Size	Construction	Body Shape	Gasket Material	Max. Pressure @ Temp.		Each
BSPP Male



		1/8	—	02	Hollow	Hex	Buna-N	5,000 psi @ 72° F	4822T297	000000


		1/4	—	04	Hollow	Hex	Buna-N	5,000 psi @ 72° F	4822T298	00000
		3/8	—	06	Hollow	Hex	Buna-N	5,000 psi @ 72° F	4822T299	00000
		1/2	—	08	Hollow	Hex	Buna-N	4,500 psi @ 72° F	4822T301	00000
		3/4	—	12	Hollow	Hex	Buna-N	3,600 psi @ 72° F	4822T302	00000


		UN/UNF (SAE Straight) Male



				—	3/8"-24	03	Hollow	Hex	Fluoroelastomer	9,000 psi @ 72° F	51205K286	00000


				—	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

Replacement Washers

	ID, mm	OD, mm	Thk., mm		Each
For BSPP Male



	1/8	8.56	15.88	2	4822T401	00000


	1/4	11.45	20.57	2.03	4822T402	0000
	3/8	14.96	23.8	2	4822T403	0000
	1/2	18.64	28.58	2.5	4822T404	0000
	3/4	24.13	34.93	2.5	4822T406	0000

High-Pressure Stainless Steel Threaded Pipe Fittings

Use these heavy duty fittings in high-pressure flow applications.

External-Hex-Drive Plugs

Male

				316 Stainless Steel
	Thread Size	Construction	Body Shape	Max. Pressure @ Temp.		Each
Metric Male



		M3 × 0.5 mm	Solid	Hex	3,000 psi @ 72° F	6525N194	000000


		M5 × 0.8 mm	Solid	Hex	3,000 psi @ 72° F	6525N195	00000
		M6 × 1 mm	Solid	Hex	3,000 psi @ 72° F	6525N196	00000
		M8 × 1.25 mm	Solid	Hex	3,000 psi @ 72° F	6525N197	00000
		M10 × 1.25 mm	Solid	Hex	3,000 psi @ 72° F	6525N198	00000

External-Hex-Drive Plugs with Gasket

Male

						316 Stainless Steel
	Pipe Size	Dash Size	Construction	Body Shape	Gasket Material	Max. Pressure @ Temp.		Each
BSPP Male



		1	16	Hollow	Hex	Buna-N	2,900 psi @ 72° F	4822T303	000000


		1 1/4	20	Hollow	Hex	Buna-N	2,300 psi @ 72° F	4822T304	000000
		1 1/2	24	Hollow	Hex	Buna-N	1,800 psi @ 72° F	4822T305	000000
		2	32	Hollow	Hex	Buna-N	1,200 psi @ 72° F	4822T306	000000

Replacement Washers

	ID, mm	OD, mm	Thk., mm		Each
For BSPP Male



	1	30.3	42.8	3.2	4822T407	000000


	1 1/4	38.96	52.38	3.2	4822T408	00000
	1 1/2	44.86	58.6	3.2	4822T409	00000
	2	56.67	73.03	3.2	4822T411	00000

High-Pressure Iron and Steel Threaded Pipe Fittings

These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.

Note: The maximum pressure listed for Class 3000 fittings is for conditions where there are no sudden changes in pressure or velocity. Please refer to ASME B16.11 to determine the specific maximum operating pressure for your application.

External-Hex-Drive Plugs with Gasket

Male

Zinc-Plated Steel—Zinc-plated steel fittings have better corrosion resistance than plain steel fittings.

	Dash Size	Construction	Body Shape	Material	Max. Pressure @ Temp.	Gasket Material		Each
BSPP Male



	1 1/4	20	Hollow	Hex	Zinc-Plated Steel	2,500 psi @ 72° F	Buna-N	4936K884	000000


	1 1/2	24	Hollow	Hex	Zinc-Plated Steel	2,000 psi @ 72° F	Buna-N	4936K885	00000
	2	32	Hollow	Hex	Zinc-Plated Steel	2,000 psi @ 72° F	Buna-N	4936K886	00000
	2 1/2	40	Hollow	Hex	Zinc-Plated Steel	1,200 psi @ 72° F	Buna-N	4936K887	000000

Replacement Washers

	ID, mm	OD, mm	Thk., mm		Each
For BSPP Male



	1 1/4	38.96	52.38	3.2	4936K664	00000


	1 1/2	44.86	58.6	3.2	4936K639	0000
	2	56.67	73.03	3.2	4936K641	0000
	2 1/2	72.2	90.17	3.38	4936K642	00000

Non-Hardening Thread Sealants

Applicator-Top Can

Often used in high-vibration applications that could cause standard thread sealants to fail, these never fully harden and remain pliable enough to self-heal and stop leaks before they start. Formulated without PTFE, these sealants are less slippery and less likely to result in overtightenting than sealants that have PTFE, making them good for plastic pipe where overtightening could lead to cracks and breaks. They have low locking strength, so they can be adjusted without tools.

NSF/ANSI 61—To adhere to safety standards for drinking water systems, use sealants that meet NSF/ANSI 61.

	Container		Max. Pressure, psi		Temp., ° F
	Size, fl. oz.	Type	For Fluids	For Gases	Min.	Max.	For Max. Thread Dia.	Consistency	Food Industry Std.	Color		Each
Low Locking Strength



		8	Applicator-Top Can	6,000	3,000	-100	600	2"	Paste	NSF/ANSI 61	Blue	4586K9	000000

Miniature Medium-Pressure Stainless Steel Threaded Pipe Fittings

When space is at a premium choose these compact fittings. Though small in size, they have the strength to handle medium-pressure applications. Fittings are stainless steel for very good corrosion resistance.

External-Hex-Drive Plugs with Gasket

Image of Product. Front orientation. Pipe and Fittings. Miniature Medium-Pressure Stainless Steel Threaded Pipe Fittings, External-Hex-Drive Plugs with Gasket, Male, Threaded Fitting Connection, Hex Body.

Threaded Fitting

Connection, Male,

Hex Body

303 Stainless Steel—Fittings have very good corrosion resistance.

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

					303 Stainless Steel				316 Stainless Steel
	Pipe Size	Construction	Body Shape	Gasket Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
BSPP Male



		1/16	Solid	Hex	Fluoroelastomer	500 psi @ 72° F	100 psi @ 350° F	2684K301	000000	500 psi @ 72° F	100 psi @ 350° F	8767N109	000000


		1/8	Solid	Hex	Fluoroelastomer	500 psi @ 72° F	100 psi @ 350° F	2684K302	00000	500 psi @ 72° F	100 psi @ 350° F	8767N111	00000
		1/4	Hollow	Hex	Fluoroelastomer	—	—	———	0	500 psi @ 72° F	100 psi @ 350° F	8767N122	00000
		1/4	Solid	Hex	Fluoroelastomer	500 psi @ 72° F	100 psi @ 350° F	2684K303	00000	—	—	———	0

Plastic Pipe Fittings for Oil

Made of corrosion-resistant plastic, these fittings won’t deteriorate when used in oil applications. They also have high strength and impact resistance.

To prevent leaks in threaded connections, apply a sealant to the male threads. Threaded connections can be taken apart as needed for maintenance and repair. For metal threads, use PTFE tape. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.

Warning: Never use plastic pipe fittings, flanges, and pipe with compressed air or gas.

External-Hex-Drive Plugs

Male

	Material	Color	Max. Pressure @ Temp.	Pkg. Qty.		Pkg.
Metric Male



	M8 × 1 mm	Polyethylene	Yellow	Not Rated	10	4956N23	00000


	M10 × 1.5 mm	Polyethylene	Yellow	Not Rated	10	4956N25	0000
	M12 × 1.5 mm	Polyethylene	Yellow	Not Rated	10	4956N27	0000
	M16 × 1.5 mm	Polyethylene	Yellow	Not Rated	10	4956N29	0000
	M20 × 1.5 mm	Polyethylene	Yellow	Not Rated	10	4956N32	0000
	M22 × 1.5 mm	Polyethylene	Yellow	Not Rated	10	4956N33	0000
	M30 × 1.5 mm	Polyethylene	Yellow	Not Rated	5	4956N38	0000
	M32 × 1.5 mm	Polyethylene	Yellow	Not Rated	5	4956N41	00000

Thread Sealant

Applicator-Top Can

Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local VOC (Volatile Organic Compounds) regulations.

Container
Size, fl. oz.	Type	Temp. Range, ° F		Each
8	Applicator-Top Can	-100 to 600	4586K9	000000

Nuts

	Thread Direction	Material	Color	Max. Pressure @ Temp.		Each
Metric Thread



	M20 × 1.5 mm	Right Hand	Nylon	Blue	200 psi @ 72° F	3736K112	00000