M26 Couplings | McMaster-Carr

With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks.

Plugs with Hex Drive

Metric and BSPP Male Threads with Gasket

For Use With:
NPTF: Hydraulic Fluid, Oil, Steam, Water
BSPP and Metric: Hydraulic Fluid, Oil, Water
Specifications Met:
NPTF: ASTM A479
Metric: DIN 7631, ISO 9974
BSPP: ISO 1179, ISO 8434-6

			316 Stainless Steel
Thread Size	Drive Size	Max. Pressure		Each
Metric Male
M26 × 1.5 mm	12 mm	5,800 psi @ 72° F	00000000	000000

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Plugs with copper washer form a tight seal to prevent leaks. Also known as a crush washer, the washer compresses and deforms to fill gaps when tightened. Because it loses its shape when compressed, it’s not reusable. Made of copper, the washer resists rust. These plugs meet either DIN 908, DIN 909, or DIN 910, international standards for pipe plug dimensions.

Plugs with Hex Drive

BSPP and Metric Male Threads with Washer

For Use With:
NPT, BSPP, and Metric: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water
Pressure Class:
NPT: 150
Specifications Met:
BSPP and Metric: DIN 908
Pipe Nipples and Pipe:
NPT: Use Schedule 40 steel

Metric Male with Copper Washer
Thread Size	Drive Size	Max. Pressure	Max. Steam Pressure	Material		Each
M26 × 1.5 mm	12 mm	Not Rated	Not Rated	Steel	000000000	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 zinc-plated steel, which have better corrosion resistance than plain steel fittings. BSPP and metric male threads have either a gasket, or a gasket and washer, to prevent leaks.

Straight Adapters, Female × Male

BSPP and Metric
Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

NPT Female × Metric Male
Pipe Size (A)	Thread Size (A)	Dash Size (A)	Pipe Size (B)	Thread Size (B)	Dash Size (B)	Max. Pressure	Material	For Use With	Specifications Met		Each
3/4	__	12	__	M26 × 1.5 mm	__	3,000 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Oil, Water	ASME B1.20.3, DIN 7631, ISO 6149, ISO 9974	00000000	000000
Metric Female × NPT Male
__	M26 × 1.5 mm	__	3/4	__	12	3,500 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Oil, Water	ASME B1.20.3, DIN 7631, ISO 6149, ISO 9974	00000000	00000

Plugs with Hex Drive

BSPP and Metric
Male Threads
with Gasket

For Use With:
NPTF and UN/UNF (SAE Straight): Air, Hydraulic Fluid, Water
Metric, BSPP and BSPT: Air, Hydraulic Fluid, Oil, Water
Specifications Met: See table

Metric Male
Thread Size	Drive Size	Max. Pressure	Material	Specifications Met		Each
M26 × 1.5 mm	14 mm	5,600 psi @ 72° F	Zinc Plated Steel	DIN 7631, ISO 9974	00000000	000000

Plugs with External Hex Drive

BSPP and Metric
Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

Metric Male
Thread Size	Plug Construction	Max. Pressure	Material	For Use With	Specifications Met		Each
M26 × 1.5 mm	Solid	5,600 psi @ 72° F	Zinc Plated Steel	Air, Hydraulic Fluid, Oil, Water	DIN 7631, ISO 6149, ISO 9974	00000000	000000

Replacement Washers

Temperature Range: -20° to 230° F

For Metric Male
For Thread Size	Gasket Material	Thickness		Each
M26	Buna-N Rubber	2.5mm	00000000	00000

High-Pressure Plated Brass Threaded Pipe Fittings

The plating on these brass fittings creates a shiny finish and provides extra protection in corrosive environments. Fittings have the strength to handle high-pressure applications.

Nickel-plated brass fittings provide better corrosion resistance than unplated brass fittings.

Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through a wall or panel to create an inlet or outlet.

Through-Wall Straight Adapters

For Use With: Air, Natural Gas, Oil, Water

				Nickel-Plated Brass
Pipe Size	Thread Size	For Max. Wall Thick.	Max. Pressure		Each
BSPP Female × Metric Male
3/8	M26 × 1.5 mm	0.591"	1,080 psi @ 72° F	00000000	000000

Low-Pressure Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.

DIN 3852 fittings meet DIN standards for mating surface outer diameter. They have a Buna-N rubber gasket that resists grease, hydraulic oil, and motor oil—plus mild chemicals and water. The gasket stays in a groove undercut in the mating face, which prevents it from dropping out and from extruding when fittings are tightened. Black anodized and powder-coated fittings have a decorative matte black finish.

The contact surface on fittings with a flange extends beyond the external hex drive.

Plugs with External Hex Drive and Flange

BSPP and Metric
Male Threads
with Gasket

For Use With: Air, Oil, Water
Specifications Met: DIN 3852
Pipe Nipples and Pipe: Use aluminum

						Black Anodized Aluminum Alloy
Pipe Size	Thread Size	Thread Pitch, mm	Drive Size	Plug Construction	Max. Pressure		Each
Metric Male
3/4	M26	1.5	27 mm	Solid	Not Rated	00000000	000000

Metric Lead Screws and Nuts

Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, size, pitch, and number of thread starts. Class 7e and 7H components are compatible.

932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.

Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

Flange Nuts—Right-Hand Threaded

Flange nuts move objects along the length of a lead screw. They have a wide machinable flange for custom mounting.

				Flange
Thread Size	Thread Pitch, mm	Ht., mm	Dia., mm	Dia., mm	Thick., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness		Each
932 Bearing Bronze
M26	5	46	38	62	14	1	1:1	5	7H	Not Rated	000000000	0000000

Hex Nuts—Right-Hand Threaded

Hex nuts fasten and position lead screw components.

Carbon Steel
Thread Size	Thread Pitch, mm	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Fastener Strength Grade/Class	Hardness		Each
M26	5	25.4	41.3	1	1:1	5	7H	Grade 2	Not Rated	000000000	000000