Made of Nitronic 60 stainless steel, these inserts prevent the screw from binding or sticking without any coating or lubricant that could contaminate particle-free environments. 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. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.
Inserts that meet DIN 8140 adhere to international standards for dimensions.
| Screw Thread d | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | (M7) | M8 | M8 | M10 | M10 | M10 | M12 | M12 | M12 | ||
| P | Coarse thread pitch | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1 | 1.25 | - | 1.5 | - | - | 1.75 | - | - | |
| Fine thread pitch | - | - | - | - | - | - | - | - | - | 1 | - | 1 | 1.25 | - | 1 | 1.25 | ||
| L ③ | Nominal Size （min） | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 7 | 8 | 8 | 10 | 10 | 10 | 12 | 12 | 12 | |
| Nominal Size （max） | 5 | 6.25 | 7.5 | 8.75 | 10 | 12.5 | 15 | 17.5 | 20 | 20 | 25 | 25 | 20 | 30 | 24 | 24 | ||
| n ② | Number of turns （min.） | 2.9 | 3.5 | 3.9 | 3.7 | 3.7 | 4.3 | 4.2 | 5.3 | 4.7 | 6.1 | 5 | 7.6 | 6 | 5.2 | 9.3 | 7.4 | |
| Number of turns （max.） | 8.9 | 10.5 | 11.1 | 11.2 | 10.9 | 12.3 | 12.3 | 14.3 | 13.5 | 16.5 | 14.2 | 20.7 | 13.1 | 14.7 | 19.5 | 15.9 | ||
| d1 | Large diameter (min) | 2.6 | 3.3 | 3.8 | 4.55 | 5.15 | 6.35 | 7.6 | 8.65 | 9.85 | 9.85 | 12.1 | 12.1 | 12.1 | 14.4 | 14.4 | 14.4 | |
| large diameter (max) | 2.8 | 3.5 | 4 | 4.75 | 5.35 | 6.6 | 7.85 | 8.9 | 10.1 | 10.1 | 12.5 | 12.5 | 12.5 | 14.8 | 14.8 | 14.8 | ||
| Screw Thread d | M12 | (M14) | (M14) ① | (M14) | M16 | M16 | (M18) | (M18) ① | (M18) | (M18) | M20 | M20 | M20 | (M22) | (M22) | (M22) | ||
| P | Coarse thread pitch | - | 2 | - | - | 2 | - | 2.5 | - | - | - | 2.5 | - | - | 2.5 | - | - | |
| Fine thread pitch | 1.5 | - | 1.25 | 1.5 | - | 1.5 | - | 1.5 | 1.5 | 2 | - | 1.5 | 2 | - | 1.5 | 2 | ||
| L ③ | Nominal Size （min） | 12 | 14 | 14.4 | 14 | 16 | 16 | 18 | - | 18 | 18 | 20 | 20 | 20 | 22 | 22 | 22 | |
| Nominal Size （max） | 30 | 35 | 16.4 | 35 | 40 | 40 | 45 | 12 | 45 | 45 | 40 | 40 | 40 | 44 | 33 | 44 | ||
| n ② | Number of turns （min.） | 6.2 | 5.6 | 9.4 | 7.4 | 6.5 | 8.7 | 5.6 | - | 9.5 | 7.1 | 6.3 | 10.7 | 8 | 6.9 | 11.7 | 8.7 | |
| Number of turns （max.） | 15.7 | 15.2 | 10.6 | 19.9 | 17.5 | 22.9 | 15.5 | 6 | 25.3 | 19.1 | 13.7 | 22.4 | 16.8 | 15 | 18.1 | 18.4 | ||
| d1 | Large diameter (min) | 14.4 | 16.8 | 16.8 | 16.8 | 19 | 19 | 21.5 | 21.5 | 21.5 | 21.5 | 23.7 | 23.7 | 23.7 | 26.3 | 26.3 | 26.3 | |
| large diameter (max) | 14.8 | 17.2 | 17.2 | 17.2 | 19.4 | 19.4 | 22 | 22 | 22 | 22 | 24.2 | 24.2 | 24.2 | 26.8 | 26.8 | 26.8 | ||
| Screw Thread d | M24 | M24 | M24 | (M27) | M30 | M30 | M30 | (M33) | (M33) | M36 | M36 | M36 | (M39) | (M39) | (M39) | |||
| P | Coarse thread pitch | 3 | - | - | 3 | 3.5 | - | - | 3.5 | - | 4 | - | - | 4 | - | - | ||
| Fine thread pitch | - | 1.5 | 2 | - | - | 1.5 | 2 | - | 2 | - | 2 | 3 | - | 2 | 3 | |||
| L ③ | Nominal Size （min） | 24 | 24 | 24 | 27 | 30 | 30 | 30 | 33 | 33 | 36 | 36 | 36 | 39 | 39 | 39 | ||
| Nominal Size （max） | 48 | 36 | 48 | 54 | 60 | 45 | 45 | 66 | 49.5 | 72 | 54 | 54 | 78 | 58.5 | 58.5 | |||
| n ② | Number of turns （min.） | 6.2 | 12.9 | 9.6 | 7.1 | 7 | 16.5 | 12.3 | 7.8 | 13.7 | 7 | 14.1 | 9.9 | 7.7 | 16.3 | 10.8 | ||
| Number of turns （max.） | 14 | 19.8 | 20.2 | 15.4 | 14.9 | 25.3 | 19 | 16.5 | 21.2 | 15.2 | 21.9 | 15.3 | 16.6 | 25 | 16.8 | |||
| d1 | Large diameter (min) | 28.6 | 28.6 | 28.6 | 32.2 | 35.2 | 35.2 | 35.2 | 38.3 | 38.3 | 42.1 | 42.1 | 42.1 | 45.1 | 45.1 | 45.1 | ||
| large diameter (max) | 29.1 | 29.1 | 29.1 | 32.7 | 35.7 | 35.7 | 35.7 | 38.8 | 38.8 | 42.6 | 42.6 | 42.6 | 45.6 | 45.6 | 45.6 | |||