Nickel Helicoils | McMaster-Carr

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81 Products

About Threaded Inserts

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

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.

Nickel—More resistant to acids and salt water than stainless steel inserts.

	Inserts							Through-Hole Taps		Closed-End Hole Taps		Installation Tools		Prong Break-Off Tools
	Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each		Each		Each		Each
Pronged







				Nickel

				2-56	0.129"	41 Ga.	0.096"	1	94264A305	00000	91709A098	000000	91709A401	000000	90261A140	000000	92955A101	0000000


				6-32	0.138"	25 Ga.	0.150"	1	94264A420	0000	91709A102	00000	91709A416	00000	90261A152	000000	92955A105	00000
				10-24	0.190"	5 Ga.	0.206"	1	94264A430	0000	91709A104	00000	91709A428	00000	90261A154	000000	92955A109	00000
				10-24	0.380"	5 Ga.	0.206"	1	94264A432	0000	91709A104	00000	91709A428	00000	90261A154	000000	92955A109	00000
				10-32	0.285"	13/64"	0.203"	1	94264A477	0000	91709A151	00000	91709A431	00000	90261A161	000000	92955A109	00000
				1/4"-20	0.250"	H	0.266"	1	94264A441	0000	91709A105	00000	91709A437	00000	90261A155	000000	92955A111	00000
				1/4"-20	0.375"	H	0.266"	1	94264A445	0000	91709A105	00000	91709A437	00000	90261A155	000000	92955A111	00000
				5/16"-18	0.312"	Q	0.332"	1	94264A451	0000	91709A106	00000	91709A443	00000	90261A156	000000	92955A113	000000
				5/16"-18	0.469"	Q	0.332"	1	94264A454	0000	91709A106	00000	91709A443	00000	90261A156	000000	92955A113	000000
				5/16"-18	0.625"	Q	0.332"	1	94264A457	00000	91709A106	00000	91709A443	00000	90261A156	000000	92955A113	000000
				3/8"-16	0.375"	X	0.397"	1	94264A462	0000	91709A107	00000	91709A449	00000	90261A157	000000	92955A115	000000


				3/8"-16	0.562"	X	0.397"	1	94264A466	0000	91709A107	00000	91709A449	00000	90261A157	000000	92955A115	000000
				3/8"-16	0.750"	X	0.397"	1	94264A469	00000	91709A107	00000	91709A449	00000	90261A157	000000	92955A115	000000
				M3 x 0.5 mm	3 mm	3.2 mm	3.2 mm	1	94264A129	0000	91709A355	00000	91709A524	00000	90261A188	000000	92955A155	000000
				M3 x 0.5 mm	6 mm	3.2 mm	3.2 mm	1	94264A136	0000	91709A355	00000	91709A524	00000	90261A188	000000	92955A155	000000
				M4 x 0.7 mm	4 mm	4.25 mm	4.25 mm	1	94264A140	0000	91709A359	00000	91709A527	00000	90261A190	000000	92955A160	000000
				M4 x 0.7 mm	6 mm	4.25 mm	4.25 mm	1	94264A143	0000	91709A359	00000	91709A527	00000	90261A190	000000	92955A160	000000
				M4 x 0.7 mm	8 mm	4.25 mm	4.25 mm	1	94264A147	0000	91709A359	00000	91709A527	00000	90261A190	000000	92955A160	000000
				M5 x 0.8 mm	7.5 mm	5.3 mm	5.3 mm	1	94264A155	0000	91709A201	00000	91709A530	00000	90261A191	000000	92955A129	00000
				M5 x 0.8 mm	10 mm	5.3 mm	5.3 mm	1	94264A158	0000	91709A201	00000	91709A530	00000	90261A191	000000	92955A129	00000
				M6 x 1 mm	9 mm	6.3 mm	6.3 mm	1	94264A164	0000	91709A202	00000	91709A533	00000	90261A192	000000	92955A131	00000


				M6 x 1 mm	12 mm	6.3 mm	6.3 mm	1	94264A168	0000	91709A202	00000	91709A533	00000	90261A192	000000	92955A131	00000
				M8 x 1.25 mm	8 mm	8.4 mm	8.4 mm	1	94264A172	0000	91709A204	00000	91709A542	00000	90261A194	000000	92955A133	000000
				M8 x 1.25 mm	12 mm	8.4 mm	8.4 mm	1	94264A176	0000	91709A204	00000	91709A542	00000	90261A194	000000	92955A133	000000
				M8 x 1.25 mm	16 mm	8.4 mm	8.4 mm	1	94264A183	00000	91709A204	00000	91709A542	00000	90261A194	000000	92955A133	000000
				M10 x 1.5 mm	10 mm	10.5 mm	10.5 mm	1	94264A110	00000	91709A205	00000	91709A548	00000	90261A195	000000	92955A135	000000
				M10 x 1.5 mm	15 mm	10.5 mm	10.5 mm	1	94264A114	0000	91709A205	00000	91709A548	00000	90261A195	000000	92955A135	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


	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	00000
	10-24, 10-32, 12-24, 12-28, 1/4"-20, 1/4"-28, 1/4"-32, 1/4"-80, 5/16"-18, 5/16"-24, 5/16"-32, 3/8"-16, 3/8"-24, M5, M6, M7, M8, M10	90254A320	00000