Cap and Plug Kits | McMaster-Carr

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23 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.

37° Flared Fittings for Steel Tubing

For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
Tubing: Use with seamless steel
Specifications Met: SAE J514

Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. They require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately. Fittings are zinc-plated steel for fair corrosion resistance.

Plug and Cap Assortments

Temperature Range: -60° to 400° F

Number of Pieces	Includes	Material		Each
62	Plug for 1/4" Tube OD (10 Each) Plug for 3/8" Tube OD (10 Each) Plug for 1/2" Tube OD (4 Each) Plug for 5/8" Tube OD (3 Each) Plug for 3/4" Tube OD (2 Each) Plug for 1" Tube OD (2 Each) Cap for 1/4" Tube OD (10 Each) Cap for 3/8" Tube OD (10 Each) Cap for 1/2" Tube OD (4 Each) Cap for 5/8" Tube OD (3 Each) Cap for 3/4" Tube OD (2 Each) Cap for 1" Tube OD (2 Each) Metal Box	Zinc-Plated Steel	50695K784	000000

Sleeves

Temperature Range: -60° to 400° F

Use these sleeves with a nut and fitting to provide a tight metal-to-metal seal on steel tubing that is flared to 37°. Sleeves are zinc-plated steel for fair corrosion resistance. They are also known as ferrules.

Inch × metric sleeve adapters convert the fitting from inch to metric.

For Tube OD
Inch	Metric, mm	Sleeve Material	Max. Pressure		Each
Inch Sleeves
1/4"	__	Zinc-Plated Steel	4,500 psi @ 72° F	50695K216	00000
3/8"	__	Zinc-Plated Steel	4,000 psi @ 72° F	50695K218	000
1/2"	__	Zinc-Plated Steel	4,000 psi @ 72° F	50695K222	0000
5/8"	__	Zinc-Plated Steel	3,000 psi @ 72° F	50695K628	0000
3/4"	__	Zinc-Plated Steel	3,000 psi @ 72° F	50695K524	0000
1"	__	Zinc-Plated Steel	2,500 psi @ 72° F	50695K526	0000
Inch × Metric Sleeve Adapters
1/4"	6	Zinc-Plated Steel	4,500 psi @ 72° F	50695K111	000
3/8"	10	Zinc-Plated Steel	4,000 psi @ 72° F	50695K113	0000
1/2"	12	Zinc-Plated Steel	4,000 psi @ 72° F	50695K114	0000
5/8"	14	Zinc-Plated Steel	3,000 psi @ 72° F	50695K115	0000
5/8"	16	Zinc-Plated Steel	3,000 psi @ 72° F	50695K117	00000

Nuts

Temperature Range: -60° to 400° F

For Tube OD	Nut Material	Max. Pressure		Each
1/4"	Zinc-Plated Steel	4,500 psi @ 72° F	50695K224	00000
3/8"	Zinc-Plated Steel	4,000 psi @ 72° F	50695K226	0000
1/2"	Zinc-Plated Steel	4,000 psi @ 72° F	50695K228	0000
5/8"	Zinc-Plated Steel	3,000 psi @ 72° F	50695K636	0000
3/4"	Zinc-Plated Steel	3,000 psi @ 72° F	50695K532	0000
1"	Zinc-Plated Steel	2,500 psi @ 72° F	50695K534	0000

30° Flared Fittings for Steel Tubing

Specifications Met: See table

Also known as JIS (Japanese Industrial Standard) fittings, these have a 30° flare on one or both ends. Fittings are zinc-plated steel for fair corrosion resistance.

Plug and Cap Assortments

Temperature Range: -65° to 500° F

Number of Pieces	Includes	Material	Specifications Met		Each
24	Plug for 3/8" Tube OD, 1/4 Pipe (2 Each) Plug for 1/2" Tube OD, 3/8 Pipe (2 Each) Plug for 5/8" Tube OD, 1/2 Pipe (2 Each) Plug for 7/8" Tube OD, 3/4 Pipe (2 Each) Plug for 1-1/8" Tube OD, 1 Pipe (2 Each) Plug for 1-3/8" Tube OD, 1-1/4 Pipe (2 Each) Cap for 3/8" Tube OD, 1/4 Pipe (2 Each) Cap for 1/2" Tube OD, 3/8 Pipe (2 Each) Cap for 5/8" Tube OD, 1/2 Pipe (2 Each) Cap for 7/8" Tube OD, 3/4 Pipe (2 Each) Cap for 1-1/8" Tube OD, 1 Pipe (2 Each) Cap for 1-3/8" Tube OD, 1-1/4 Pipe (2 Each) Metal Box	Zinc-Plated Steel	ISO 228-1, JIS B 0202, JIS B 8363	1774N114	0000000

Compression Fittings for Steel Tubing

For Use With: Inch: Air, Hydraulic Fluid, Water
Metric: Hydraulic Fluid
Tubing: Inch: Use with welded steel
Metric: Use with seamless steel
Specifications Met: Inch: SAE J514
Metric: ISO 8434, DIN 2353

A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless and bite fittings.

Zinc-plated steel fittings have fair corrosion resistance.

ISO 8434 (formerly DIN 2353) fittings meet international standards for tube fitting pressures.

Plug and Cap Assortments

Temperature Range: -20° to 230° F

Number of Pieces	Includes	Material	Max. Pressure		Each
72	Plug for 6 mm OD Tubing (4 each) Plug for 8 mm OD Tubing (4 each) Plug for 10 mm OD Tubing (6 each) Plug for 12 mm OD Tubing (6 each) Plug for 15 mm OD Tubing (6 each) Plug for 18 mm OD Tubing (4 each) Plug for 22 mm OD Tubing (4 each) Plug for 28 mm OD Tubing (2 each) Cap for 6 mm OD Tubing (4 each) Cap for 8 mm OD Tubing (4 each) Cap for 10 mm OD Tubing (6 each) Cap for 12 mm OD Tubing (6 each) Cap for 15 mm OD Tubing (6 each) Cap for 18 mm OD Tubing (4 each) Cap for 22 mm OD Tubing (4 each) Cap for 28 mm OD Tubing (2 each) Metal Box	Zinc-Plated Steel	2,300 psi @ 72° F	5269K606	0000000

O-Ring Face Seal Fittings for Steel Tubing

For Use With: Air, Hydraulic Fluid
Temperature Range: -30° to 250° F, except BSPP fittings are -20° to 230° F
Tubing: Use with seamless steel
Specifications Met: SAE J1453

Plug and Cap Assortments

Cap

Plug

Number of Pieces	Includes	Material	Max. Pressure		Each
62	Plug for 1/4" OD Tubing (10 each) Plug for 3/8" OD Tubing (10 each) Plug for 1/2" OD Tubing (4 each) Plug for 5/8" OD Tubing (3 each) Plug for 3/4" OD Tubing (2 each) Plug for 1" OD Tubing (2 each) Cap for 1/4" OD Tubing (10 each) Cap for 3/8" OD Tubing (10 each) Cap for 1/2" OD Tubing (4 each) Cap for 5/8" OD Tubing (3 each) Cap for 3/4" OD Tubing (2 each) Cap for 1" OD Tubing (2 each) Metal Box	Zinc-Plated Steel	6,000 psi @ 72° F	6407T111	0000000

High-Pressure Steel Threaded Pipe Cap and Plug Assortments

Assortment

Cap

Plug

The heavy duty caps and plugs in these assortments come in various sizes and stand up to high-pressure flow applications. Made of steel, they’re for use in noncorrosive environments. You can take them apart as needed for maintenance and repair because they’re threaded.

Thread Type	Number of Pieces	Plug Construction	Max. Pressure	Includes	Material		Each
NPT	64	Solid	2,000 psi to 5,000 psi	32 Caps in the following pipe sizes: 1/8 (10 ea.) 11/16" Lg. 1/4 (8 ea.) 3/4" Lg. 3/8 (6 ea.) 13/16" Lg. 1/2 (4 ea.) 1" Lg. 3/4 (2 ea.) 1 1/2" Lg. 1 (2 ea.) 1 1/4" Lg. 32 Plugs in the following pipe sizes: 1/8 (10 ea.) 9/16" Lg. 1/4 (8 ea.) 3/4" Lg. 3/8 (6 ea.) 3/4" Lg. 1/2 (4 ea.) 15/16" Lg. 3/4 (2 ea.) 1 1/8" Lg. 1 (2 ea.) 1 3/8" Lg.	Steel	4951N11	0000000
BSPP	48	Solid	2,000 psi to 5,000 psi	24 Caps in the following pipe sizes: 1/8 (4 ea.) 15 mm Lg. 1/4 (4 ea.) 17 mm Lg. 3/8 (4 ea.) 18 mm Lg. 1/2 (4 ea.) 22 mm Lg. 5/8 (2 ea.) 22 mm Lg. 3/4 (4 ea.) 27 mm Lg. 1 (2 ea.) 30 mm Lg. 24 Plugs in the following pipe sizes: 1/8 (4 ea.) 17 mm Lg. 1/4 (4 ea.) 19 mm Lg. 3/8 (4 ea.) 20 mm Lg. 1/2 (4 ea.) 23 mm Lg. 5/8 (2 ea.) 27 mm Lg. 3/4 (4 ea.) 24 mm Lg. 1 (2 ea.) 30 mm Lg.	Steel	4951N12	000000