1-64 Bushings | McMaster-Carr

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15 Products

How to Install Helical Inserts

About Helical Insert Length

Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

For technical drawings and 3-D models, click on a part number.

Inch

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
18-8 Stainless Steel—Right-Hand Threaded
1-64	0.073"	No. 46	0.081"	10	000000000	000000	000000000	000000	000000000	000000	000000000	0000000	000000000	0000000
1-64	0.11"	No. 46	0.081"	10	000000000	00000	000000000	00000	000000000	00000	000000000	000000	000000000	000000
1-64	0.146"	No. 46	0.081"	10	000000000	00000	000000000	00000	000000000	00000	000000000	000000	000000000	000000

Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening. Also known as Heli-Coil inserts, these inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

For technical drawings and 3-D models, click on a part number.

Inch

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
18-8 Stainless Steel
1-64	0.073"	No. 46	0.081"	5	000000000	000000	000000000	000000	000000000	000000	000000000	0000000	000000000	0000000
1-64	0.11"	No. 46	0.081"	5	000000000	0000	000000000	00000	000000000	00000	000000000	000000	000000000	000000

Helical Insert Assortments with Installation Tools

Assortments include various sizes of helical inserts and a tap, a drill bit, and an installation tool for each thread size. Also known as Heli-Coil inserts, the inserts have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw.

Inch
Includes	No. of Inserts Included	Thread Spacing	Drill Bit Size	For Max. Hole Dia.		Each
18-8 Stainless Steel
1-64 Thread × 0.11" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 2-56 Thread × 0.129" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 3-48 Thread × 0.148" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 4-40 Thread × 0.168" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 6-32 Thread × 0.207" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 8-32 Thread × 0.246" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) Drill Bits Through-Hole Taps Installation Tools	288	Coarse	5/64" 3/32" No. 36 No. 31 No. 26 No. 17	5/64" 3/32" 0.1065" 0.12" 0.147" 0.173"	000000000	0000000

Stainless Steel Helical Inserts without Prong

Without a prong to break off and retrieve, these inserts are often used where debris could cause damage. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert. Installation requires a drill bit, a helical insert tap, and an installation tool.

Add an extraction tool to remove these inserts.

For technical drawings and 3-D models, click on a part number.

Inch

Inserts							Through-Hole Taps		Closed-End Hole Taps		Installation Tools		Extraction Tools
Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each		Each		Each		Each
18-8 Stainless Steel
1-64	0.073"	No. 46	0.081"	5	000000000	00000	000000000	000000	000000000	000000	000000000	0000000	000000000	0000000
1-64	0.11"	No. 46	0.081"	5	000000000	0000	000000000	00000	000000000	00000	000000000	000000	000000000	000000
1-64	0.146"	No. 46	0.081"	5	000000000	0000	000000000	00000	000000000	00000	000000000	000000	000000000	000000