M33 Inserts | McMaster-Carr

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10 Products

About Threaded Inserts

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

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 3 mm	M33 x 2 mm	33	31	31	4	90245A213	000000	000000	94010A365	000000	2	90245A341	0000000


				M24 x 2 mm	M33 x 2 mm	33	31	31	4	90245A217	00000	00000	94010A365	00000	—	———	0




						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 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

	M24	M33	Straight	94010A365	000000

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.

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

	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

Screw-In Plugs for Pipe and Tubing

Threaded for the most secure fit on female pipe and fittings. These plugs protect from damage during shipping and storage. They also keep dust, paint, and coatings from blocking holes and threads.

For Straight-Thread Fittings

Image of Product. Front orientation. Contains Annotated. Protective Plugs. Screw In, For Round Holes, For Pipe, For Round Shapes, For Straight-Thread Fittings, Nylon.

Nylon

Nylon—Durable and wear resistant, these plugs also resist oils, solvents, and mild acids.

	Thread
	Size	Type	Ht., mm	Max. Temp., ° F	Color	Pkg. Qty.		Pkg.
Nylon



		M33 × 2 mm	Metric	13	150	Yellow	10	5481K34	000000

Key-Locking Threaded Insert Installation Tools


Style A	Style C

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



	M24	M33	A	Slotted End	6721N93	000000

Threaded Insert Installation Tools with Spring

Style C

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



	M24	M33	C	Slotted End, Sleeve	93904A798	000000

Helical Threaded Insert Removal Tools

To remove installed helical inserts, place the tip of these tools into the insert and lightly strike the tool’s head. Then, turn the tool counterclockwise with pressure to extract the insert.

		Each
Standard Profile



	1 1/8"-7, 1 1/8"-12, 1 1/4"-7, 1 1/4"-12, 1 3/8"-6, 1 3/8"-12, 1 1/2"-6, 1 1/2"-12, M27, M30, M33, M36, M39	90254A114	000000