M2.2 Fasteners | McMaster-Carr

Our most corrosion-resistant button head Torx screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With a deep six-lobe opening, the Torx drive prevents your driver from slipping and stripping the drive. Also known as star drives, they withstand more torque than slotted, Phillips, and hex drives.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they don't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M2.2 × 0.45 mm

				5	3.8	1.1	Fully Threaded	100,000	100	90910A930	000000


				6	3.8	1.1	Fully Threaded	100,000	100	90910A931	00000
				8	3.8	1.1	Fully Threaded	100,000	100	90910A932	00000

Stainless Steel Button Head Hex-Drive Screws

These button head screws won't corrode from moisture and chemicals, but they aren't as strong as alloy steel screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they don't hold up to the harsh chemicals that 316 stainless steel can.

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M2.2 × 0.45 mm

				6	3.8	1.4	Fully Threaded	Not Rated	50	92095A117	000000

Tapered Heat-Set Threaded Inserts For Plastic

Tapered at one end, these inserts are easier to align in a hole during installation than straight inserts. Use a drill bit to create a straight hole, then taper the top half. Once installed, heat the insert with a soldering tip to melt the surrounding plastic.

Brass—Conductive and nonmagnetic, these inserts are useful for electrical applications. They resist moisture but aren't as strong as steel inserts.

	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	For Hole Taper Angle	Specs. Met	Pkg. Qty.		Pkg.
Brass



	M2.2 x 0.45 mm	2.92	3	3	8°	ASTM B16	25	94180A101	00000


	M2.2 x 0.45 mm	4.78	2.7	2.7	8°	ASTM B16	25	94180A102	00000

Spring-Loaded Helical Threaded Insert Prong Break-Off Tools

Cleanly snap prongs off installed helical inserts with just one hand. Because they work faster than standard prong break-off tools, these are a good choice when you have many prongs to remove. Press your tool into an insert to trigger the spring-loaded punch and snap off the prong.

For Standard-Length Inserts—Use these tools for inserts that are 1 to 2 times as long as the diameter.

For Long Inserts—Use these tools for inserts that are 2 _1/2 to 3 times as long as the diameter.

	Mfr.		Each
For Standard-Length Inserts



	2-56, 3-48, 3-56, M2, M2.2	—	92955A311	000000


	M2.2, M2.5	Heli-Coil	92955A204	000000


	For Long Inserts



			2-56, M2, M2.2	—	92955A411	00000

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		Prong Break-Off Tools
	Thread Size	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	Specs. Met	Pkg. Qty.		Pkg.		Each		Each		Each		Each
Pronged







				18-8 Stainless Steel

				M2.2 x 0.45 mm	3.3	2.35	2.35	SAE MA3329-150	1	90296A382	00000	91709A190	000000	91709A210	0000000	90261A186	000000	92955A204	0000000

Helical Threaded Insert Installation Tools

Straight Handle

Install your pronged helical inserts into tapped holes. Screw an insert onto these tools and drive them a quarter to half-turn below the material’s surface.

	Handle Style	For Use With		Each
Metric Thread



	M2.2 × 0.45 mm	Straight	Helical Inserts, Screw-Locking Helical Inserts	90261A186	000000

Stainless Steel Hex-Drive Precision Shoulder Screws

Our go-to choice for assemblies that require smooth, accurate movement. These screws are engineered for tight tolerances, with shoulder diameters twice as precise as those on standard-fit screws. They're made of stainless steel, so they won't rust, though they're not as strong as their alloy steel counterparts.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

				Head, mm				Certificate			Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Type	Form		1-4	5-Up
18-8 Stainless Steel







				3 mm Diameter Shoulder (-0.025 mm to 0 mm Tolerance)

				5	M2.2 × 0.45 mm	4	5	2	2	70,000	—	—	90278A722	000000	00000


				6	M2.2 × 0.45 mm	4	5	2	2	70,000	—	—	90278A723	00000	0000
				8	M2.2 × 0.45 mm	4	5	2	2	70,000	Material Certificate	Digital	90278A724	00000	00000

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		Prong Break-Off Tools
	Thread Size	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	Specs. Met	Pkg. Qty.		Pkg.		Each		Each		Each		Each
Pronged







				18-8 Stainless Steel

				M2.2 x 0.45 mm	2.2	2.35	2.35	SAE MA3279-100	5	91732A760	00000	91709A190	000000	91709A210	0000000	90261A186	000000	92955A204	0000000


				M2.2 x 0.45 mm	3.3	2.35	2.35	SAE MA3279-150	5	91732A761	00000	91709A190	00000	91709A210	000000	90261A186	00000	92955A204	000000
				M2.2 x 0.45 mm	4.4	2.35	2.35	SAE MA3279-200	5	91732A762	00000	91709A190	00000	91709A210	000000	90261A186	00000	92955A204	000000

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



	2-56, 2-64, M2.2	90254A290	000000