M30 Reducers | McMaster-Carr

Filter by

System of Measurement

Thread Pitch

Threaded Insert Type

For Tap Thread Size

Material

For Tap Type

Installed Length

Thread Type

End Type

Thread Direction

Drill Bit Size

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

REACH

RoHS

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

For Use In

Key-Locking Insert Wall Type

Thread Spacing

For Material Thickness

Hole Diameter

Profile

Threaded Insert Securing Type

External Thread

Sold As

Individual

Kit

Tensile Strength

100,000 psi or greater

Not Rated

Forward

How can we improve?

20 Products

About Threaded Inserts

Choose the right threaded insert for your application and learn how to install it securely.

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.

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

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







	Black Phosphate-Coated Steel

	M20 x 1.5 mm	M30 x 2 mm	30	28	28	4	3	90245A331	000000


	M20 x 2.5 mm	M30 x 2 mm	30	28	28	4	3	90245A326	00000




			18-8 Stainless Steel

			M20 x 1.5 mm	M30 x 2 mm	30	28	28	4	3	93715A485	000000


			M20 x 2.5 mm	M30 x 2 mm	30	28	28	4	3	93715A480	000000

Helical Threaded Inserts

Pronged

Restore, reinforce, or create threads in metal. The tough coils on these inserts expand once installed to anchor in a tapped hole. Also known as Heli-Coil inserts, they're often used in engine heads and machinery housings where strong connections are critical. Unlike threadlocking inserts, you can remove and reuse them without them losing their strength.

Installation requires a drill bit, a helical insert tap, and an installation tool.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

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

	Inserts								Through-Hole Taps		Closed-End Hole Taps		Installation Tools		Inserts with Installation Tools
	Thread Size	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Specs. Met	Pkg. Qty.		Pkg.		Each		Each		Each	No. of Inserts Included		Each
Pronged







				18-8 Stainless Steel

				M30 x 3.5 mm	45	1 7/32"	1.219"	SAE MA3279-183	1	92450A145	00000	92450A345	0000000	91709A350	0000000	92450A543	000000	5	91732A972	0000000

Extraction Tools

Remove installed helical inserts.

For Pronged Helical Inserts—Place the tip into pronged inserts and lightly strike the tool’s head. Then, turn the tool counterclockwise with pressure to extract the insert.

		Each
For Pronged Helical Inserts



	1 1/8"-7, 1 1/8"-12, 1 1/4"-7, 1 1/4"-8, 1 1/4"-12, 1 3/8"-6, 1 3/8"-12, 1 1/2"-6, 1 1/2"-8, 1 1/2"-12, M27, M30, M36, M39	90254A360	0000000

Key-Locking Threaded Insert Installation Tools


Style A	Style D

Thread inserts and drive down their keys with a single tool. These tools are compatible with Keensert inserts.

Threaded Insert Installation Tools

Style A

	For Tap Thread Size	Style	Features		Each
For Thick-Wall Inserts



	M20	M30	A	Slotted End	6721N91	000000

Threaded Insert Installation Tools with Spring

Style D

The tradespersons’ choice for installing Mil. Spec. inserts. A spring holds the sleeve under tension, so wobbles and jostles don’t interfere with a clean, professional install.

	For Tap Thread Size	Style	Features		Each
For Thick-Wall Inserts



	M20	M30	D	Sleeve, Slotted End	93904A796	000000

Helical Threaded Insert Installation and Prong Break-Off Tools

T-Handle

Install helical inserts and break off prongs with one tool and a hammer strike. These tools have a slot that grips your insert’s prong for turning both left- and right-hand threads. Slide an insert onto these tools and drive them a quarter-turn to half-turn below the material’s surface. Then, strike the end of the tool with a hammer to break off the prong. These tools work with pronged helical inserts.

	Handle Style		Each
Metric Thread



	M30 × 3.5 mm	T-Handle	92450A543	000000

Helical Threaded Inserts with Installation Tools

Installation Tool and

Through-Hole Tap

Quickly restore stripped threads—these inserts come with through-hole taps and installation tools. The tough coils on these inserts expand once installed to anchor in a tapped hole.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

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

	For Max. Hole Dia.	No. of Inserts Included	Includes		Each
Pronged







	18-8 Stainless Steel

	M30 x 3.5 mm	45	1 1/4"	1.250"	5	Installation Tool Through-Hole Tap	91732A972	0000000

Key-Locking Threaded Insert Drivers

Place the tip of these tools into a key-locking insert after you've threaded it into a hole with your fingers. Then, strike these tools with a hammer to drive the keys into the material and secure the insert. They’re compatible with Keensert inserts.

Choose the tool that matches your insert’s thread size and tap thread size.

		Each
Metric Thread







	For Thick-Wall Inserts

	M20	M30	Straight	94010A355	000000

Key-Locking Threaded Insert Blank Drivers

Hand thread an insert blank into a tapped hole before placing the tip of these tools on the insert. Strike the tool with a hammer to drive the keys into your material.

	Handle Style		Each
Metric Thread



	M30	Straight	93741A320	0000000

Finish-Your-Own Key-Locking Threaded Inserts for Soft Metal

Tap the thread size you need into the solid body of these inserts. They’re a great choice when you need a custom combination of internal thread size and external diameter. Use them to repair or add new threads in soft metal, such as aluminum. They can also plug threaded holes without the hassle of welding. Keys on the inserts drive into material to prevent slipping and rotating in the hole.

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.

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

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

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







				Black Phosphate-Coated Steel

				M30 x 2 mm	30	20	28	28	4	93774A320	000000	93741A320	0000000

Screw-Locking Helical Threaded Inserts

Pronged

The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration. Use these inserts to create or repair threads in pumps and other machinery that shakes and rattles. Also known as Heli-Coil inserts.

Installation requires a drill bit, a helical insert tap, and an installation tool.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

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

	Inserts								Through-Hole Taps		Closed-End Hole Taps		Installation Tools
	Thread Size	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Specs. Met	Pkg. Qty.		Pkg.		Each		Each		Each
Pronged







				18-8 Stainless Steel

				M30 x 3.5 mm	45	1 7/32"	1.219"	DIN 8140	1	90296A436	000000	92450A345	0000000	91709A350	0000000	92450A543	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.

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

				M20 x 1.5 mm	M30 x 2 mm	30	28	28	4	90245A205	000000	000000	94010A355	000000	3	90245A331	000000


				M20 x 2.5 mm	M30 x 2 mm	30	28	28	4	90245A201	00000	00000	94010A355	00000	3	90245A326	00000




						18-8 Stainless Steel

						M20 x 1.5 mm	M30 x 2 mm	30	28	28	4	93715A675	00000	00000	94010A355	00000	3	93715A485	000000


						M20 x 2.5 mm	M30 x 2 mm	30	28	28	4	93715A670	00000	00000	94010A355	00000	3	93715A480	000000