M24 Couplings | McMaster-Carr

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14 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.

About Nuts, Materials, and Finishes

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) Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

BSPP Male × Metric Male
Pipe Size (A)	Dash Size (A)	Thread Size (B)	Max. Pressure	For Use With	Specifications Met		Each
3/4	12	M24 × 1.5 mm	3,500 psi @ 72° F	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 1179, ISO 6149, ISO 8434-6, ISO 9974	00000000	000000

Replacement Washers

Temperature Range: -20° to 230° F

For BSPP Male
For Pipe Size	For Thread Size	Gasket Material	Thickness		Each
3/4	__	Buna-N Rubber	2.5mm	00000000	00000
For Metric Male
__	M24	Buna-N Rubber	2mm	00000000	0000

Plastic Barbed Tube Fittings for Air and Water

Fittings have barbs that grip onto tubing.

Nylon fittings have excellent impact and abrasion resistance.

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

90° Elbow Adapters, Tube × Male Threaded Pipe

Temperature Range: See table
Tubing: Semi-Clear: Use with firm or soft (Durometer 45A-80A) polyurethane rubber or PVC plastic
Opaque: Use with firm or soft (Durometer 40A-80A) polyurethane rubber or PVC plastic

Metric Threads
For Tube ID	Thread Size	Material	Color	Clarity	Max. Pressure	Temp. Range, °F	Pkg. Qty.		Pkg.
19mm	M24 × 2 mm	Nylon Plastic	Gray	Opaque	145 psi @ 72° F	-40° to 190°	10	00000000	000000

Metric Low-Strength Steel Coupling Nuts

Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.

Zinc-plated steel coupling nuts resist corrosion in wet environments.

Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Zinc-Plated Steel
M24	3	72	36	DIN 6334	000000000	000000	000000
Black-Oxide Steel
M24	3	64	38	__	000000000	00000	00000

Metric Medium-Strength Steel Coupling Nuts—Class 8

Often referred to as extension nuts, use these to connect and extend threaded rods. They're comparable in strength to Class 8.8 bolts.

Zinc-plated steel coupling nuts resist corrosion in wet environments.

Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Zinc-Plated Steel—Class 8
M24	3	72	36	DIN 6334	000000000	000000	000000
Black-Oxide Steel—Class 8
M24	3	72	36	DIN 6334	000000000	00000	00000

Metric High-Strength Steel Coupling Nuts—Class 10

Often referred to as extension nuts, use these to connect and extend threaded rods. Made from Class 10 steel, they're about 25% stronger than medium-strength steel coupling nuts and comparable in strength to Class 10.9 bolts.

Steel nuts are best for dry environments, since moisture will cause them to rust. They are ready for painting or welding.

Zinc-plated steel nuts are corrosion resistant in wet environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Steel—Class 10
M24	3	72	36	DIN 6334	000000000	000000	000000
Zinc-Plated Steel—Class 10
M24	3	72	36	DIN 6334	000000000	00000	00000

Metric 18-8 Stainless Steel Coupling Nuts

Stainless Steel

Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
18-8 Stainless Steel
M24	3	72	36	DIN 6334	000000000	000000	000000

Metric Super-Corrosion-Resistant 316 Stainless Steel Coupling Nuts

Made from 316 stainless steel, these coupling have excellent resistance to chemicals and salt water. Also known as extension nuts, use them to connect and extend threaded rods. They may be mildly magnetic.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
316 Stainless Steel
M24	3	72	36	DIN 6334	000000000	000000	000000

Brass Coupling Nuts

These coupling nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. Also known as extension nuts, use them to connect and extend threaded rods.

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

Metric

				Each
Thread Size	Lg., mm	Wd., mm		1-9	10-Up
Brass
M24	72	36	000000000	000000	000000

Stainless Steel Extra-Long Coupling Nuts

These coupling nuts have good chemical resistance. Also known as sleeve nuts, they're at least twice the length of standard coupling nuts to provide more room to connect and extend long lengths of threaded rods.

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

Metric

Thread							Each
Size	Pitch, mm	Lg., mm	Wd., mm	Threading	Min. Thread Lg., mm		1-9	10-Up
18-8 Stainless Steel
M24	3	144	41	Partially Threaded	24	000000000	0000000	0000000