M33 Adapters | McMaster-Carr

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15 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 Stainless Steel Threaded Pipe Fittings

With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines.

Straight Adapters with Gasket

Female x 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.

	Thread Size					316 Stainless Steel
	(A)	(B)	Dash Size (A)	Body Shape	Gasket Material	Max. Pressure @ Temp.		Each
UN/UNF (SAE Straight) Female × Metric Male



		1 5/16"-12	M33 × 2 mm	16	Hex	Buna-N	3,000 psi @ 72° F	51205K788	0000000

Hex-Drive Plugs with Gasket

Male

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

			316 Stainless Steel
	Thread Size	Gasket Material	Max. Pressure @ Temp.		Each
Metric Male



		M33 × 2 mm	Fluoroelastomer	5,800 psi @ 72° F	4822T286	000000

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.

Through-Wall Straight Adapters

Female x Male

Through-wall fittings are also known as bulkhead couplings; they mount through your wall or tank to create an inlet or outlet. When installing, the gasket should be on the inside of the wall.

Nickel-Plated Brass—Nickel-plated brass pipe provides better corrosion resistance than unplated brass.

	Thread Size (B)	For Max. Wall Thk.	Body Shape	Material	Max. Pressure @ Temp.		Each
BSPP Female × Metric Male



	3/4	M33 × 1.5 mm	0.886"	Hex	Nickel-Plated Brass	1,230 psi @ 72° F	9151K267	000000

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.

Straight Adapters with Gasket

Female × Male

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

	Thread Size (B)	Dash Size (A)	Body Shape	Material	Max. Pressure @ Temp.	Gasket Material		Each
NPT Female × Metric Male



	1	M33 × 2 mm	16	Hex	Zinc-Plated Steel	2,500 psi @ 72° F	Buna-N	4936K454	000000

Replacement Washers

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



	M33	28.7	42	2	4936K659	00000

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.

Flanged External-Hex-Drive Plugs with Gasket

Male

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

Anodized Aluminum—Anodized and powder-coated fittings have a decorative matte black finish.

DIN 3852—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.

	Thread Size	Flange OD, mm	Construction	Body Shape	Material	Color	Max. Pressure @ Temp.	Gasket Material	Specs. Met		Each
Metric Male



	1	M33 × 1.5 mm	40	Solid	Hex	Aluminum	—	Not Rated	Buna-N	DIN 3852	7919N115	000000


	1	M33 × 1.5 mm	40	Solid	Hex	Anodized Aluminum	Black	Not Rated	Buna-N	DIN 3852	7919N129	00000

180° Bend Connectors

Image of Product. Front orientation. Pipe Traps. Low-Pressure Aluminum Threaded Pipe Fittings.

180° bend connectors are also known as U-bends.

	Material	Max. Pressure @ Temp.	Shape		Each
NPT Female



	1	356 Aluminum	150 psi @ 72° F	180° Bend	44705K482	000000

Key-Locking Threaded Inserts for Soft Metal

Add strong threads in soft metal, such as aluminum. The keys on these inserts drive into holes to hold more securely than thread-locking or helical inserts. They prevent slipping and rotating, so they’re stable enough for use in vehicle or aerospace parts that experience heavy vibration. These inserts are comparable to Keensert inserts.

To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.

Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.

Black Phosphate-Coated Steel—These inserts resist occasional moisture.

18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.

	Inserts									Installation Tools		Inserts with Installation Tools
								Each
	Thread Size	For Tap Thread Size	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	No. of Locking Keys		1-9	10-Up		Each	No. of Inserts Included		Each
Standard Wall







				Black Phosphate-Coated Steel

				M24 x 2 mm	M33 x 2 mm	33	31	31	4	90245A217	000000	000000	94010A365	000000	—	———	0


				M24 x 3 mm	M33 x 2 mm	33	31	31	4	90245A213	00000	00000	94010A365	00000	2	90245A341	0000000




						18-8 Stainless Steel

						M24 x 3 mm	M33 x 2 mm	33	31	31	4	93715A685	00000	00000	94010A365	00000	—	———	0

Key-Locking Threaded Inserts with Installation Tools

Paired with the right tool for installation, these inserts create strong threads in soft metal, such as aluminum. They have keys that drive into material to prevent inserts from slipping and rotating in the hole.

Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.

Black Phosphate-Coated Steel—These inserts resist occasional moisture.

	Drill Bit Size, mm	For Max. Hole Dia., mm	No. of Locking Keys	No. of Inserts Included		Each
Standard Wall







	Black Phosphate-Coated Steel

	M24 x 3 mm	M33 x 2 mm	33	31	31	4	2	90245A341	0000000

Screw-Locking Seize-Resistant Key-Locking Threaded Inserts for Soft Metal

Create the tightest hold in aluminum and other soft metal without screws sticking. The lubricant on these inserts eases installation, and the irregularly shaped threads won’t let screws back out from vibration. Inserts have keys that drive into material to prevent them from slipping or rotating in the hole.

Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.

Dry-Film-Lubricated Cadmium-Plated Steel—The plating creates a barrier against rust.

	Inserts								Installation Tools
	Thread Size	For Tap Thread Size	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	No. of Locking Keys		Each		Each
Standard Wall







				Dry-Film-Lubricated Cadmium-Plated Steel

				M24 x 3 mm	M33 x 2 mm	33	31	31	4	97255A338	0000000	93904A798	000000