M20 Reducers | McMaster-Carr

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28 Products

How to Measure Threaded Pipe Size

How to Install Helical Inserts

About Helical Insert Length

How to Install Key-Locking Inserts

Low-Profile Hex Manifolds

When you’re short on vertical space, these manifolds are a good fit—they have outlets on the side instead of on top, so they have a lower profile than rectangular manifolds. Use them to distribute air, water, or hydraulic fluid to five locations from a single supply source. Manifolds have mounting holes, so you can mount from the top.

Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.

316 stainless steel manifolds have excellent corrosion resistance and can handle fuel, gasoline, coolant and other harsh substances.

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

Anodized Aluminum—Metric Inlets × Metric Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure: 1,000 psi @ 72° F
Maximum Vacuum: 27 in. of Hg @ 72° F

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Wd., mm	Ht., mm	Outlet Spacing	Color		Each
5	M20	1.5	M18	1.5	50	31	Standard	Black	00000000	0000000
5	M22	1.5	M20	1.5	50	38	Standard	Black	00000000	000000

316 Stainless Steel—Metric Inlets × Metric Outlets

For Use With: Air, Water, Hydraulic Fluid, Alcohol, Coolant, Cutting Oil, Deionized Water, Diesel Fuel, Fuel Oil, Gasoline, Mineral Oil, Nitrogen
Temperature Range: -100° to 500° F
Maximum Pressure: 3,500 psi @ 72° F
Maximum Vacuum: 27 in. of Hg @ 72° F

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Wd., mm	Ht., mm	Outlet Spacing		Each
5	M20	1.5	M18	1.5	50	31	Standard	00000000	0000000
5	M22	1.5	M20	1.5	50	38	Standard	00000000	000000

Black-Phosphate Steel Easy-to-Install Thread-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Also known as E-Z Lok, these inserts use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. Installation requires a drill bit and a standard tap. Then set the insert with a bolt and two nuts, or use an installation bit.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

To drive slotted inserts, you can use a slotted screwdriver instead of using an installation bit or a bolt and two nuts.

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

Metric

Installation Bit

Inserts
			For Tap									Installation Bits
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Drive Style	Pkg. Qty.		Pkg.		Each
Black-Phosphate Steel with Thick Wall
M20	2.5	Coarse	M36	4	30mm	33 mm	33mm	Slotted	1	000000000	000000	000000000	000000

Stainless Steel Helical Inserts

Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

Inserts that meet DIN 8140 adhere to international standards for dimensions.

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

Metric

Inserts										Through-Hole Taps		Closed-End Hole Taps		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Specifications Met	Pkg. Qty.		Pkg.		Each		Each		Each
18-8 Stainless Steel—Right-Hand Threaded
M20	2.5	Coarse	20	13/16"	13/16"	DIN 8140, SAE MA3279-124	1	000000000	00000	000000000	0000000	000000000	0000000	000000000	0000000
M20	2.5	Coarse	30	13/16"	13/16"	DIN 8140, SAE MA3279-174	1	000000000	0000	000000000	000000	000000000	000000	000000000	000000
M20	1.5	Extra Fine	30	13/16"	13/16"	SAE MA3279-172	1	000000000	0000	000000000	000000	000000000	000000	000000000	000000

Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening. Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

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

Metric

Inserts										Through-Hole Taps		Closed-End Hole Taps		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Specifications Met	Pkg. Qty.		Pkg.		Each		Each		Each
18-8 Stainless Steel
M20	2.5	Coarse	20	13/16"	13/16"	SAE MA3329-124	1	000000000	00000	000000000	0000000	000000000	0000000	000000000	0000000
M20	2.5	Coarse	30	13/16"	13/16"	SAE MA3329-174	1	000000000	0000	000000000	000000	000000000	000000	000000000	000000

Helical Inserts with Installation Tools

Shown with Five Inserts and Drill Bit

Inserts come with a through-hole tap and installation tool. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw.

Metric

18-8 Stainless Steel—Right-Hand Threaded
Thread Size	Thread Pitch, mm	Thread Spacing	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	No. of Inserts Included	Includes		Each
M20	2.5	Coarse	30	13/16"	13/16"	4	Drill Bit, Through-Hole Tap, Installation Tool	000000000	0000000

18-8 Stainless Steel Key-Locking Inserts

Made of stainless steel, these inserts have good corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

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

Metric

Inserts
			For Tap							Each		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		1-9	10-Up		Each
18-8 Stainless Steel with Thick Wall
M20	1.5	Extra Fine	M30	2	30mm	28 mm	28mm	4	000000000	000000	000000	000000000	000000
M20	2.5	Coarse	M30	2	30mm	28 mm	28mm	4	000000000	00000	00000	000000000	00000

Black-Phosphate Steel Key-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole with stripped threads.

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

Metric

Inserts
			For Tap							Each		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		1-9	10-Up		Each
Black-Phosphate Steel with Thick Wall
M20	1.5	Extra Fine	M30	2	30mm	28 mm	28mm	4	000000000	000000	000000	000000000	000000
M20	2.5	Coarse	M30	2	30mm	28 mm	28mm	4	000000000	00000	00000	000000000	00000

Key-Locking Inserts with Installation Tool

Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. These inserts are used to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.

18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.

Black-phosphate steel inserts are mildly corrosion resistant.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

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

Metric

			For Tap
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys	No. of Inserts Included		Each
18-8 Stainless Steel with Thick Wall
M20	1.5	Extra Fine	M30	2	30mm	28 mm	28mm	4	3	000000000	0000000
M20	2.5	Coarse	M30	2	30mm	28 mm	28mm	4	3	000000000	000000
Black-Phosphate Steel with Thick Wall
M20	1.5	Extra Fine	M30	2	30mm	28 mm	28mm	4	3	000000000	00000
M20	2.5	Coarse	M30	2	30mm	28 mm	28mm	4	3	000000000	00000

Tapping Inserts for Soft Metal

Also known as Tap-Lok inserts, these inserts cut their own threads in soft metals such as aluminum, so there’s no need to tap the hole. Their cutting teeth lock them into your material, so they won’t budge when you install or remove a screw. Thread the insert onto a bolt with two nuts before driving it into a drilled hole with a wrench. For repeated installation, use an installation tool with a ratchet wrench or insert the installation tool into a drill press. These inserts have a zinc plating, so they resist corrosion in wet environments.

Inserts with thick walls are used to add threads to large holes. They’re often used to replace threads that have been drilled out.

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

Metric

Zinc-Plated Steel with Thick Wall
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.		Each
M20	2.5	28.2	63/64"	63/64"	000000000	000000