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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.
| Includes | No. of Inserts Included | Thread Spacing  | Drill Bit Size | For Max. Hole Dia. | Each | |
Inch | ||||||
|---|---|---|---|---|---|---|
18-8 Stainless Steel | ||||||
| Prong Break-Off Tool 4-40 Thread × 0.112" Installed Lg. (12 Each) 4-40 Thread × 0.168" Installed Lg. (12 Each) 4-40 Thread × 0.224" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | No. 31 | 0.12" | 000000000 | 0000000 |
| Prong Break-Off Tool 5-40 Thread × 1/8" Installed Lg. (12 Each) 5-40 Thread × 0.188" Installed Lg. (12 Each) 5-40 Thread × 1/4" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | No. 29 | 0.136" | 000000000 | 000000 |
| Prong Break-Off Tool 6-32 Thread × 0.138" Installed Lg. (12 Each) 6-32 Thread × 0.207" Installed Lg. (12 Each) 6-32 Thread × 0.276" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | No. 25 | 0.1495" | 000000000 | 000000 |
| Prong Break-Off Tool 6-40 Thread × 0.138" Installed Lg. (12 Each) 6-40 Thread × 0.207" Installed Lg. (12 Each) 6-40 Thread × 0.276" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Fine | No. 25 | 0.1495" | 000000000 | 000000 |
| Prong Break-Off Tool 8-32 Thread × 0.164" Installed Lg. (12 Each) 8-32 Thread × 0.246" Installed Lg. (12 Each) 8-32 Thread × 0.328" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | 11/64" | 11/64" | 000000000 | 00000 |
| Prong Break-Off Tool 8-36 Thread × 0.164" Installed Lg. (12 Each) 8-36 Thread × 0.246" Installed Lg. (12 Each) 8-36 Thread × 0.328" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Fine | No. 17 | 0.173" | 000000000 | 000000 |
| Prong Break-Off Tool 10-24 Thread × 0.19" Installed Lg. (12 Each) 10-24 Thread × 0.285" Installed Lg. (12 Each) 10-24 Thread × 0.38" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | 13/64" | 13/64" | 000000000 | 00000 |
| Prong Break-Off Tool 10-32 Thread × 0.19" Installed Lg. (12 Each) 10-32 Thread × 0.285" Installed Lg. (12 Each) 10-32 Thread × 0.38" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Fine | 13/64" | 13/64" | 000000000 | 00000 |
| Prong Break-Off Tool 12-24 Thread × 0.216" Installed Lg. (12 Each) 12-24 Thread × 0.328" Installed Lg. (12 Each) 12-24 Thread × 0.432" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | 15/64" | 15/64" | 000000000 | 00000 |
| Prong Break-Off Tool 1/4"-20 Thread × 1/4" Installed Lg. (12 Each) 1/4"-20 Thread × 3/8" Installed Lg. (12 Each) 1/4"-20 Thread × 1/2" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | 17/64" | 17/64" | 000000000 | 00000 |
| Prong Break-Off Tool 1/4"-28 Thread × 1/4" Installed Lg. (12 Each) 1/4"-28 Thread × 3/8" Installed Lg. (12 Each) 1/4"-28 Thread × 1/2" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Fine | 17/64" | 17/64" | 000000000 | 00000 |
| Prong Break-Off Tool 5/16"-18 Thread × 0.312" Installed Lg. (12 Each) 5/16"-18 Thread × 0.469" Installed Lg. (12 Each) 5/16"-18 Thread × 5/8" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | 21/64" | 21/64" | 000000000 | 00000 |
| Prong Break-Off Tool 5/16"-24 Thread × 0.312" Installed Lg. (12 Each) 5/16"-24 Thread × 0.469" Installed Lg. (12 Each) 5/16"-24 Thread × 5/8" Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Fine | 21/64" | 21/64" | 000000000 | 00000 |
| Prong Break-Off Tool 3/8"-16 Thread × 3/8" Installed Lg. (6 Each) 3/8"-16 Thread × 0.562" Installed Lg. (6 Each) 3/8"-16 Thread × 3/4" Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 25/64" | 25/64" | 000000000 | 00000 |
| Prong Break-Off Tool 3/8"-24 Thread × 3/8" Installed Lg. (6 Each) 3/8"-24 Thread × 0.562" Installed Lg. (6 Each) 3/8"-24 Thread × 3/4" Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Fine | 25/64" | 25/64" | 000000000 | 00000 |
| Prong Break-Off Tool 7/16"-14 Thread × 0.438" Installed Lg. (6 Each) 7/16"-14 Thread × 0.656" Installed Lg. (6 Each) 7/16"-14 Thread × 7/8" Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 29/64" | 29/64" | 000000000 | 000000 |
| Prong Break-Off Tool 7/16"-20 Thread × 0.438" Installed Lg. (6 Each) 7/16"-20 Thread × 0.656" Installed Lg. (6 Each) 7/16"-20 Thread × 7/8" Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Fine | 29/64" | 29/64" | 000000000 | 000000 |
| Prong Break-Off Tool 1/2"-13 Thread × 1/2" Installed Lg. (6 Each) 1/2"-13 Thread × 3/4" Installed Lg. (6 Each) 1/2"-13 Thread × 1" Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 17/32" | 17/32" | 000000000 | 000000 |
| Prong Break-Off Tool 1/2"-20 Thread × 1/2" Installed Lg. (6 Each) 1/2"-20 Thread × 3/4" Installed Lg. (6 Each) 1/2"-20 Thread × 1" Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Fine | 33/64" | 33/64" | 000000000 | 000000 |
| 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 | 000000 |
| 10-32 Thread × 0.285" Installed Lg. (12 Each) 1/4"-28 Thread × 3/8" Installed Lg. (12 Each) 5/16"-24 Thread × 0.469" Installed Lg. (12 Each) 3/8"-24 Thread × 0.562" Installed Lg. (12 Each) 7/16"-20 Thread × 0.656" Installed Lg. (6 Each) 1/2"-20 Thread × 3/4" Installed Lg. (6 Each) Drill Bits Through-Hole Taps Installation Tools | 60 | Fine | 13/64" 17/64" 21/64" 25/64" 29/64" 33/64" | 13/64" 17/64" 21/64" 25/64" 29/64" 33/64" | 000000000 | 000000 |
| 1/4"-20 Thread × 3/8" Installed Lg. (12 Each) 5/16"-18 Thread × 0.469" Installed Lg. (12 Each) 3/8"-16 Thread × 0.562" Installed Lg. (12 Each) 7/16"-14 Thread × 0.656" Installed Lg. (6 Each) 1/2"-13 Thread × 3/4" Installed Lg. (6 Each) 5/8"-11 Thread × 15/16" Installed Lg. (6 Each) Drill Bits Through-Hole Taps Installation Tools | 54 | Coarse | 17/64" 21/64" 25/64" 29/64" 17/32" 21/32" | 17/64" 21/64" 25/64" 29/64" 17/32" 21/32" | 000000000 | 000000 |
Metric | ||||||
18-8 Stainless Steel | ||||||
| Prong Break-Off Tool M4×0.7 mm Thread × 4 mm Installed Lg. (6 Each) M4×0.7 mm Thread × 6 mm Installed Lg. (6 Each) M4×0.7 mm Thread × 8 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 11/64" | 11/64" | 000000000 | 00000 |
| Prong Break-Off Tool M5×0.8 mm Thread × 5 mm Installed Lg. (6 Each) M5×0.8 mm Thread × 7.5 mm Installed Lg. (6 Each) M5×0.8 mm Thread × 10 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 13/64" | 13/64" | 000000000 | 00000 |
| Prong Break-Off Tool M6×1 mm Thread × 6 mm Installed Lg. (6 Each) M6×1 mm Thread × 9 mm Installed Lg. (6 Each) M6×1 mm Thread × 12 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 1/4" | 1/4" | 000000000 | 00000 |
| Prong Break-Off Tool M10×1 mm Thread × 10 mm Installed Lg. (6 Each) M10×1 mm Thread × 15 mm Installed Lg. (6 Each) M10×1 mm Thread × 20 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Fine | 13/32" | 13/32" | 000000000 | 000000 |
| Prong Break-Off Tool M10×1.5 mm Thread × 10 mm Installed Lg. (6 Each) M10×1.5 mm Thread × 15 mm Installed Lg. (6 Each) M10×1.5 mm Thread × 20 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 13/32" | 13/32" | 000000000 | 00000 |
| Prong Break-Off Tool M12×1.25 mm Thread × 12 mm Installed Lg. (6 Each) M12×1.25 mm Thread × 18 mm Installed Lg. (6 Each) M12×1.25 mm Thread × 24 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Extra Fine | 31/64" | 31/64" | 000000000 | 000000 |
| Prong Break-Off Tool M12×1.75 mm Thread × 12 mm Installed Lg. (6 Each) M12×1.75 mm Thread × 18 mm Installed Lg. (6 Each) M12×1.75 mm Thread × 24 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 31/64" | 31/64" | 000000000 | 00000 |
| M3×0.5 mm Thread × 3 mm Installed Lg. (12 Each) M3×0.5 mm Thread × 4.5 mm Installed Lg. (12 Each) M3×0.5 mm Thread × 6 mm Installed Lg. (12 Each) Drill Bit Through-Hole Tap Installation Tool | 36 | Coarse | 1/8" | 1/8" | 000000000 | 000000 |
| M5×0.8 mm Thread × 7.5 mm Installed Lg. (12 Each) M6×1 mm Thread × 9 mm Installed Lg. (12 Each) M8×1.25 mm Thread × 12 mm Installed Lg. (12 Each) M10×1.5 mm Thread × 15 mm Installed Lg. (12 Each) Drill Bits Through-Hole Taps Installation Tools | 48 | Coarse | 13/64" 1/4" 21/64" 13/32" | 13/64" 1/4" 21/64" 13/32" | 000000000 | 000000 |
| M7×1 mm Thread × 7 mm Installed Lg. (6 Each) M7×1 mm Thread × 10.5 mm Installed Lg. (6 Each) M7×1 mm Thread × 14 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 9/32" | 9/32" | 000000000 | 00000 |
| M8×1.25 mm Thread × 8 mm Installed Lg. (6 Each) M8×1.25 mm Thread × 12 mm Installed Lg. (6 Each) M8×1.25 mm Thread × 16 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 21/64" | 21/64" | 000000000 | 00000 |
Helical Inserts with Installation Tools
Shown with Five Inserts and Drill Bit
Inserts come with a through-hole tap and installation tool. Also known as Heli-Coil inserts, they 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
| Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||
|---|---|---|---|---|---|---|---|
| 4-40 | 0.224" | No. 31 | 0.12" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 6-32 | 0.138" | No. 26 | 0.1495" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 6-32 | 0.276" | No. 26 | 0.1495" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 8-32 | 0.164" | No. 17 | 11/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 8-32 | 0.328" | No. 17 | 11/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 10-24 | 0.38" | 13/64" | 13/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 10-32 | 0.19" | No. 7 | 13/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 10-32 | 0.38" | No. 7 | 13/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 1/4"-20 | 1/4" | H | 17/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 1/4"-20 | 1/2" | H | 17/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 5/16"-18 | 0.312" | Q | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 5/16"-18 | 5/8" | Q | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 3/8"-16 | 3/8" | X | 25/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 3/8"-16 | 3/4" | X | 25/64" | 5 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 1/2"-13 | 1/2" | 33/64" | 17/32" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1/2"-13 | 1" | 33/64" | 17/32" | 5 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
Metric
| Thread Size | Thread Pitch, mm | Thread Spacing | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | Coarse | 3 | 3.15 mm | 1/8" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
| M3 | 0.5 | Coarse | 6 | 3.15 mm | 1/8" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| M4 | 0.7 | Coarse | 4 | 4.2 mm | 11/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M4 | 0.7 | Coarse | 8 | 4.2 mm | 11/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M5 | 0.8 | Coarse | 5 | 5.2 mm | 13/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M5 | 0.8 | Coarse | 10 | 5.2 mm | 13/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M6 | 1 | Coarse | 6 | 6.25 mm | 1/4" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M6 | 1 | Coarse | 12 | 6.25 mm | 1/4" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M8 | 1.25 | Coarse | 8 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 16 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
Spark Plug Thread Repair Kits
Kits include helical inserts, a tap, and an installation tool. Also known as Heli-Coil inserts, they 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.
| Includes | No. of Inserts Included | Each | |
18-8 Stainless Steel | |||
|---|---|---|---|
| M14×1.25 mm Thread × 3/8" Insert Reach (6 Each) M14×1.25 mm Thread × 7/16" Insert Reach (6 Each) M14×1.25 mm Thread × 0.472" Insert Reach (6 Each) M14×1.25 mm Thread × 1/2" Insert Reach (6 Each) M14×1.25 mm Thread × 3/4" Insert Reach (6 Each) Through-Hole Tap Installation Tool | 30 | 000000000 | 0000000 |
| M18×1.5 mm Thread × 1/2" Insert Reach (24 Each) Through-Hole Tap Installation Tool | 24 | 000000000 | 000000 |
Spark Plug Thread Repair Kits for Gasket-Seat and Taper-Seat Ports
These kits have short-, normal-, and long-reach inserts, an installation tool, and a tap.
| Includes | No. of Inserts Included | Each | |
18-8 Stainless Steel | |||
|---|---|---|---|
| M14×1.25 mm Thread × Short Insert Reach (1 Each) M14×1.25 mm Thread × Normal Insert Reach (1 Each) M14×1.25 mm Thread × Long Insert Reach (1 Each) Through-Hole Tap Installation Tool | 3 | 000000000 | 000000 |
| M14×1.25 mm Thread × Short Insert Reach (6 Each) M14×1.25 mm Thread × Normal Insert Reach (6 Each) M14×1.25 mm Thread × Long Insert Reach (6 Each) Through-Hole Tap Installation Tool | 18 | 000000000 | 000000 |