M3.5 Helicoils | McMaster-Carr

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Helical Inserts

Screw-Locking Helical Inserts

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107 Products

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.

Narrow Profile—The tip of these tools has a narrower angle than standard removal tools to reduce the chance it will dig into your material’s surface when you strike the tool.

	Mfr.		Each
Standard Profile



	2-56, 3-48, 3-56, 4-40, 4-48, 5-40, 6-32, 6-40, 8-32, 8-36, M2, M2.2, M2.5, M3, M3.5, M4	—	90254A111	000000


	4-40, 4-48, 5-40, 6-32, 6-40, 8-32, 8-36, 10-24, 10-32, 12-24, 1/4"-20, 1/4"-28, 3/8"-16, M3, M3.5, M4, M5, M6, M7, M8, M9, M10	—	90254A112	00000


	Narrow Profile



			3-48, 3-56, 4-40, 4-48, 5-40, 5-44, 6-32, 6-40, 8-32, 8-36, 8-40, M2.5, M3, M3.5, M4	Heli-Coil	90254A310	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



	6-32, 6-40, 6-48, M3.5	—	92955A314	000000


	M3, M3.5	Heli-Coil	92955A155	000000


	For Long Inserts



			6-32, 6-40, M3.5	—	92955A414	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

				M3.5 x 0.6 mm	3.5	3.7	3.7	DIN 8140, SAE MA3279-103	5	91732A774	00000	91709A195	000000	91709A220	0000000	90261A189	0000000	92955A155	0000000


				M3.5 x 0.6 mm	5.3	3.7	3.7	DIN 8140, SAE MA3279-153	10	91732A775	0000	91709A195	00000	91709A220	000000	90261A189	000000	92955A155	000000
				M3.5 x 0.6 mm	7	3.7	3.7	DIN 8140, SAE MA3279-203	5	91732A778	0000	91709A195	00000	91709A220	000000	90261A189	000000	92955A155	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



	3-48, 3-56, 4-40, 4-48, 5-40, 5-44, 6-32, 6-40, 8-32, 8-36, 8-40, M2.5, M3, M3.5, M4	90254A310	000000

Helical Insert Taps

Match the size of helical inserts so they fit tightly when installed in the hole.

High-Speed Steel—These taps resist heat and wear to stay sharp.

Plug Chamfer—Our go-to chamfer type. With a longer taper than a bottoming chamfer, they are easier to turn but won't thread as close the bottom of a hole.

Bottoming Chamfer—Cut all the way to the bottom of blind holes with taps that have the shortest taper. Since these require the most force to turn, they’re often used to finish holes started by taper- or plug-chamfer taps.

						Drill Bit			Plug Chamfer		Bottoming Chamfer
	For Insert Size	Thread Lg.	Overall Lg.	For Insert Thread Type	No. of Flutes	Size, mm	Decimal Size Equiv.	Shank Type		Each		Each
High-Speed Steel







				Uncoated

				M3.5	3/4"	2 1/8"	Metric	3	3.7	0.1456"	Square	91709A195	000000	91709A220	0000000

Easy-Start Helical Threaded Insert Installation Tools

These tools compress the diameter of your insert so it fits easily into a tapped hole. They’re the best choice for preventing misaligned or damaged threads—just make sure you have space to turn the crank. Screw or slide an insert onto your tool and drive it between a quarter-turn and half-turn below the surface. Also known as prewinders.

Threaded Insert Installation Tools with Depth Stop


Crank Handle	Threaded Drive

Ensure consistent installation across multiple inserts. Set your desired installation depth, and the stop will prevent you from driving your insert any further.

Threaded Drive Helical Insert Tool—These tools align each coil of your insert perfectly with the thread pitch of your tapped hole for easy installation.

	Mfr.	Handle Style	Helical Insert Tool Drive Type	For Use With		Each
Metric Thread



	M3.5 × 0.6 mm	—	Crank	Threaded	Helical Inserts, Screw-Locking Helical Inserts	1338N54	000000


	M3.5 × 0.6 mm	Heli-Coil	Crank	Threaded	Helical Inserts, Screw-Locking Helical Inserts	90261A189	000000

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

				M3.5 x 0.6 mm	5.3	3.7	3.7	DIN 8140, SAE MA3329-153	1	90296A372	00000	91709A195	000000	91709A220	0000000	90261A189	0000000	92955A155	0000000

Air-Powered Helical Threaded Insert Installation Tools

Install standard and prongless helical inserts in high-volume production and assembly. Powered by compressed air, these tools deliver more force than electric tools. Use them to install a wide range of insert sizes. Press the lever to install the insert, then release to reverse out. These tools require a nosepiece and nosepiece adapter (both sold separately).

					Air Inlet
Threaded Insert Tool Cycle Time, sec.	Max. Speed @ 90 psi, rpm	Overall Lg.	Wt., lb.	Average Air Consumption @ Pressure	Pipe Size	Thread Type	Gender		Each
5	1,500	5 3/4"	0.9	14.4 ft³/min @ 90 psi	1/4	NPT	Female	8868N11	000000000

Accessories and Replacements for Threaded Insert Installation Tools

Easy-Start Nosepiece Adapters

Required to attach an easy-start nosepiece to the tool.

For Thread Size		Each
2-56, 4-40, 6-32, 6-40, 8-32, 8-36, 10-24, 10-32, 1/4"-20, 1/4"-28, M2.5, M3, M3.5, M4, M5, M6, M7	8868N12	0000000
5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, M8, M10, M12	8868N13	000000

For Thread Size		Each
2-56, 4-40, M2.5, M3	8868N14	0000000

Easy-Start Nosepieces

Image of Product. Front orientation. Threaded Insert Installation Tool Nosepieces. Air-Powered Helical Threaded Insert Installation Tools.

Compress the insert’s diameter and align each coil with the thread pitch to easily install the insert straight into a tapped hole. They work with loose and strip-feed inserts. Also known as prewinders.

		For Pronged Helical Inserts			For Prongless Helical Inserts
For Thread Size	For Use With	Max. Air Pressure, psi		Each	Max. Air Pressure, psi		Each
2-56	Helical Inserts, Screw-Locking Helical Inserts	20	8868N35	0000000	15	8868N15	0000000
4-40	Helical Inserts, Screw-Locking Helical Inserts	20	8868N36	000000	20	8868N16	000000
6-32	Helical Inserts, Screw-Locking Helical Inserts	30	8868N37	000000	30	8868N17	000000
8-32	Helical Inserts, Screw-Locking Helical Inserts	40	8868N38	000000	30	8868N18	000000
10-24	Helical Inserts, Screw-Locking Helical Inserts	40	8868N39	000000	40	8868N19	000000
10-32	Helical Inserts, Screw-Locking Helical Inserts	40	8868N45	000000	30	8868N24	000000
1/4"-20	Helical Inserts, Screw-Locking Helical Inserts	45	8868N41	000000	45	8868N21	000000
1/4"-28	Helical Inserts, Screw-Locking Helical Inserts	45	8868N46	000000	45	8868N25	000000
5/16"-18	Helical Inserts, Screw-Locking Helical Inserts	50	8868N42	000000	50	8868N22	000000
5/16"-24	Helical Inserts, Screw-Locking Helical Inserts	50	8868N47	000000	50	8868N26	000000
3/8"-16	Helical Inserts, Screw-Locking Helical Inserts	60	8868N43	000000	60	8868N23	000000
3/8"-24	Helical Inserts, Screw-Locking Helical Inserts	60	8868N48	000000	60	8868N27	000000
7/16"-20	Helical Inserts, Screw-Locking Helical Inserts	50	8868N49	000000	—	———	0
1/2"-13	Helical Inserts, Screw-Locking Helical Inserts	80	8868N44	000000	—	———	0
1/2"-20	Helical Inserts, Screw-Locking Helical Inserts	80	8868N51	000000	—	———	0
M2.5 × 0.45 mm	Helical Inserts, Screw-Locking Helical Inserts	20	8868N52	000000	15	8868N28	000000
M3 × 0.5 mm	Helical Inserts, Screw-Locking Helical Inserts	30	8868N53	000000	20	8868N29	000000
M4 × 0.7 mm	Helical Inserts, Screw-Locking Helical Inserts	40	8868N54	000000	30	8868N31	000000
M5 × 0.8 mm	Helical Inserts, Screw-Locking Helical Inserts	40	8868N55	000000	30	8868N32	000000
M6 × 1 mm	Helical Inserts, Screw-Locking Helical Inserts	45	8868N56	000000	40	8868N33	000000
M8 × 1 mm	Helical Inserts, Screw-Locking Helical Inserts	50	8868N58	000000	—	———	0
M8 × 1.25 mm	Helical Inserts, Screw-Locking Helical Inserts	50	8868N57	000000	50	8868N34	000000
M10 × 1.5 mm	Helical Inserts, Screw-Locking Helical Inserts	50	8868N59	000000	—	———	0
M12 × 1.75 mm	Helical Inserts, Screw-Locking Helical Inserts	60	8868N61	000000	—	———	0

Replacement Tips

Replacement installation tool tips for nosepieces include one installation tip, two pins, and two springs.

		Each
For Prongless Helical Inserts



	2-56	91049A702	000000


	4-40	91049A705	00000
	6-32	91049A708	00000
	8-32	91049A711	00000
	10-24	91049A714	00000
	10-32	91049A914	00000
	1/4"-20	91049A720	00000
	1/4"-28	91049A209	00000
	5/16"-18	91049A207	00000
	5/16"-24	91049A210	00000
	3/8"-16	91049A208	00000


	3/8"-24	91049A211	00000
	M2.5 × 0.45 mm	91049A750	00000
	M3 × 0.5 mm	91049A752	00000
	M4 × 0.7 mm	91049A754	00000
	M5 × 0.8 mm	91049A756	00000
	M6 × 1 mm	91049A758	00000
	M8 × 1.25 mm	91049A204	00000

Helical Threaded Insert Installation and Prong Break-Off Tools

L-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



6-32, 6-40, M3.5 × 0.6 mm	L-Handle	92450A173	000000

Punch-Style Helical Threaded Insert Prong Break-Off Tools

Break the prong off of installed helical inserts. Place these tools inside the insert and hit the back with a hammer. Once removed, thread in your fastener.

For Thread Size	Handle Style	For Use With		Each
6-32, 6-40, M3.5	Straight	Helical Inserts, Screw-Locking Helical Inserts	1231N13	00000

Cordless Helical Threaded Insert Installation Tools


	Shown with the Handle Folded

Install standard and prongless helical inserts in tight spaces or where no power is available. Hold down the button to drive inserts more quickly than manual tools—the tool then automatically reverses out of the hole. Attach a nosepiece that matches your insert’s thread size.

Folding Handle—Reach over obstructions and access awkward angles.

Installation Tools													Replacement Batteries		Replacement Chargers
Threaded Insert Tool Cycle Time, sec.	No-Load Rotational Speed, rpm	Torque, in·lbf	Voltage, V DC	Handle Style	Handle Range of Motion	Overall Lg.	Wt., oz.	Motor Type	Batteries Included	Battery Charger Included		Each		Each		Each
8	220 to 450	1 to 34.5	3.6	Folding	65°	10 1/2"	16.4	Brushed	Yes	Yes	8887N11	0000000	8887N12	000000	8887N13	0000000

Accessories and Replacements for Threaded Insert Installation Tools

Nosepieces

	For Use With		Each
For Pronged Helical Inserts



	2-56	Helical Inserts, Screw-Locking Helical Inserts	8887N19	000000


	4-40	Helical Inserts, Screw-Locking Helical Inserts	8887N39	00000
	6-32	Helical Inserts, Screw-Locking Helical Inserts	8887N21	00000
	8-32	Helical Inserts, Screw-Locking Helical Inserts	8887N22	00000
	10-24	Helical Inserts, Screw-Locking Helical Inserts	8887N23	00000
	10-32	Helical Inserts, Screw-Locking Helical Inserts	8887N25	00000
	1/4"-20	Helical Inserts, Screw-Locking Helical Inserts	8887N24	00000
	M2.5 × 0.45 mm	Helical Inserts, Screw-Locking Helical Inserts	8887N14	00000
	M3 × 0.5 mm	Helical Inserts, Screw-Locking Helical Inserts	8887N15	00000
	M4 × 0.7 mm	Helical Inserts, Screw-Locking Helical Inserts	8887N16	00000
	M5 × 0.8 mm	Helical Inserts, Screw-Locking Helical Inserts	8887N17	00000


	M6 × 1 mm	Helical Inserts, Screw-Locking Helical Inserts	8887N18	00000


	For Prongless Helical Inserts



			2-56	Helical Inserts, Screw-Locking Helical Inserts	8887N26	000000


			4-40	Helical Inserts, Screw-Locking Helical Inserts	8887N27	000000
			6-32	Helical Inserts, Screw-Locking Helical Inserts	8887N28	000000
			8-32	Helical Inserts, Screw-Locking Helical Inserts	8887N29	000000
			10-24	Helical Inserts, Screw-Locking Helical Inserts	8887N31	000000
			10-32	Helical Inserts	8887N32	000000
			1/4"-20	Helical Inserts, Screw-Locking Helical Inserts	8887N33	000000
			M2.5 × 0.45 mm	Helical Inserts	8887N34	000000
			M3 × 0.5 mm	Helical Inserts	8887N35	000000
			M4 × 0.7 mm	Helical Inserts	8887N36	000000
			M5 × 0.8 mm	Helical Inserts	8887N37	000000


			M6 × 1 mm	Helical Inserts	8887N38	000000

Replacement Tips

Replacement installation tool tips for nosepieces include one installation tip, two pins, and two springs.

		Each
For Prongless Helical Inserts



	2-56	91049A702	000000


	4-40	91049A705	00000
	6-32	91049A708	00000
	8-32	91049A711	00000
	10-24	91049A714	00000
	10-32	91049A914	00000
	1/4"-20	91049A720	00000
	1/4"-28	91049A209	00000
	M2.5 × 0.45 mm	91049A750	00000
	M3 × 0.5 mm	91049A752	00000
	M4 × 0.7 mm	91049A754	00000


	M5 × 0.8 mm	91049A756	00000
	M6 × 1 mm	91049A758	00000