5/8 Pipe Size Fittings | McMaster-Carr

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	Pipe Size Pipe Size	Show

5/8

	Pipe Size Pipe Size	Hide

1/16
1/8
1/4
3/8
1/2
5/8
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12

	Thread Type Thread Type

BSPP

BSPT

Metric

	Connection Type Connection Type


Pipe	Tube

	Material Material

Plastic

Stainless Steel

Steel

	Type Type


Adapter	Locknut

Plug

	Connection Style Connection Style

Threaded

Push to Connect

	Gender Gender

Female

Male

	For Use With For Use With

	Shape Shape

	Straight
	Cap/Plug

	For Tube Material For Tube Material

Nylon Plastic

Polyethylene Plastic

	Push-to-Connect Type Push-to-Connect Type

	Standard

	For Pipe Material For Pipe Material

304/304L Stainless Steel

304 Stainless Steel

	Specifications Met Specifications Met

DIN

ISO

NSF/ANSI

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	System of Measurement System of Measurement

Metric

	Body Shape Body Shape

	Hex

	For Tube OD For Tube OD

10mm

	Maximum Temperature Maximum Temperature

100° to 249° F

	Minimum Temperature Minimum Temperature

Greater than 0° F

Not Rated

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Length Length

	Maximum Pressure Maximum Pressure

10 Products

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line. 304 stainless steel fittings have very good corrosion resistance.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Locknuts that meet DIN 431 comply with international standards for pipe fitting locknut dimensions.

NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

For technical drawings and 3-D models, click on a part number.

Locknuts

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class:
NPSL: 150
Fabrication:
NPSL: Heat Treated
Specifications Met:
NPSL: ANSI/MSS SP-114, ASTM A351
BSPP: DIN 431
Pipe Nipples and Pipe:
NPSL: Use Schedule 40 stainless steel
Flanges:
NPSL: Use Class 150 stainless steel

			304 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each
BSPP Female
5/8	Not Rated	Not Rated	00000000	00000

Compact Extreme-Pressure Steel Threaded Pipe Fittings

These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized steel, which has fair corrosion resistance. BSPP and metric male threads have either a gasket, or a gasket and washer, to prevent leaks.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, Male

BSPP, Metric, and UN/UNF
(SAE Straight) Male
Threads with Gasket and Washer

For Use With: See table
Specifications Met: See table

BSPP Male × Metric Male
Pipe Size (A)	Thread Size (B)	Max. Pressure	For Use With	Specifications Met		Each
5/8	M22 × 1.5 mm	4,000 psi @ 72° F	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 1179, ISO 6149, ISO 8434-6, ISO 9974	00000000	000000
5/8	M26 × 1.5 mm	4,000 psi @ 72° F	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 1179, ISO 6149, ISO 8434-6, ISO 9974	00000000	00000

Plugs with External Hex Drive

BSPP and Metric
Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

BSPP Male
Pipe Size	Plug Construction	Max. Pressure	For Use With	Specifications Met		Each
5/8	Hollow	3,500 psi @ 72° F	Air, Hydraulic Fluid, Oil, Water	ISO 1179, ISO 8434-6	00000000	00000
BSPT Male
5/8	Solid	3,500 psi @ 72° F	Air, Hydraulic Fluid, Oil, Water	DIN EN 10226-1, ISO 7-1	00000000	0000

Replacement Washers

Temperature Range: -20° to 230° F

For BSPP Male
For Pipe Size	For Thread Size	Gasket Material	Thickness		Each
5/8	__	Buna-N Rubber	2.5mm	00000000	00000
For Metric Male
__	M22	Buna-N Rubber	2mm	00000000	0000
__	M26	Buna-N Rubber	2.5mm	00000000	0000

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. Apply a non-hardening, plastic-compatible sealant to the male threads to prevent leaks. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded 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 and pipe with compressed air or gas.

For technical drawings and 3-D models, click on a part number.

Plugs with Finger Grip, Male Threaded Pipe

For Use With: Oil
Maximum Temperature: 140° F

BSPP
Pipe Size	Material	Color	Maximum Pressure	Pkg. Qty.		Pkg.
5/8	Polyethylene Plastic	Red	Not Rated	10	0000000	00000

Push-to-Connect Tube Fittings for Drinking Water

Temperature Range: 35° to 150° F
Tubing: See table
Specifications Met: NSF/ANSI 61

Made of moisture-resistant acetal, these fittings won't absorb water and lose strength, even in high-humidity environments. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. All meet NSF/ANSI 61 for use in drinking water systems.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, Tube × Female Threaded Pipe

						For Tube
For Tube OD	Pipe Size	Material	Color	Release Ring Color	Max. Pressure	Material		Each
BSPP Threads
10mm	5/8	Acetal Plastic	Black	Black	150 psi @ 72° F	Nylon Plastic, Polyethylene Plastic	00000000	00000