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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. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | |||||||||||||||
| 2-56 | 0.086" | No. 41 | 0.096" | MS21209C0210, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
| 2-56 | 0.129" | No. 41 | 0.096" | MS21209C0215, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 2-56 | 0.172" | No. 41 | 0.096" | MS21209C0220, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 2-56 | 0.215" | No. 41 | 0.096" | MS21209C0225, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 3-48 | 0.099" | 7/64" | 7/64" | MS21209C0310, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3-48 | 0.148" | 7/64" | 7/64" | MS21209C0315, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3-56 | 0.099" | No. 36 | 0.1065" | MS21209F0310, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3-56 | 0.148" | No. 36 | 0.1065" | MS21209F0315, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.112" | No. 31 | 0.12" | MS21209C0410, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.168" | No. 31 | 0.12" | MS21209C0415, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.224" | No. 31 | 0.12" | MS21209C0420, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.28" | No. 31 | 0.12" | MS21209C0425, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.336" | No. 31 | 0.12" | MS21209C0430, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-48 | 0.112" | No. 31 | 0.12" | MS21209F0410, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-48 | 0.168" | No. 31 | 0.12" | MS21209F0415, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5-40 | 1/8" | No. 29 | 0.136" | MS21209C0510, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5-40 | 0.188" | No. 29 | 0.136" | MS21209C0515, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5-40 | 1/4" | No. 29 | 0.136" | MS21209C0520, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 6-32 | 0.138" | No. 25 | 0.1495" | MS21209C0610, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-32 | 0.207" | No. 25 | 0.1495" | MS21209C0615, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-32 | 0.276" | No. 25 | 0.1495" | MS21209C0620, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-32 | 0.345" | No. 25 | 0.1495" | MS21209C0625, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-32 | 0.414" | No. 25 | 0.1495" | MS21209C0630, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-40 | 0.138" | No. 25 | 0.1495" | MS21209F0610, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-40 | 0.207" | No. 25 | 0.1495" | MS21209F0615, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-40 | 0.276" | No. 25 | 0.1495" | MS21209F0620, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-32 | 0.164" | No. 16 | 0.177" | MS21209C0810, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-32 | 0.246" | No. 16 | 0.177" | MS21209C0815, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-32 | 0.328" | No. 16 | 0.177" | MS21209C0820, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-32 | 0.41" | No. 16 | 0.177" | MS21209C0825, NASM21209 | 1 | 000000000 | 000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-32 | 0.492" | No. 16 | 0.177" | MS21209C0830, NASM21209 | 1 | 000000000 | 000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-36 | 0.164" | No. 16 | 0.177" | MS21209F0810, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-36 | 0.246" | No. 16 | 0.177" | MS21209F0815, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 8-36 | 0.328" | No. 16 | 0.177" | MS21209F0820, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 10-24 | 0.19" | No. 5 | 0.2055" | MS21209C1-10, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-24 | 0.285" | No. 5 | 0.2055" | MS21209C1-15, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-24 | 0.38" | No. 5 | 0.2055" | MS21209C1-20, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-24 | 0.475" | No. 5 | 0.2055" | MS21209C1-25, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.285" | 13/64" | 13/64" | MS21209F1-15, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.38" | 13/64" | 13/64" | MS21209F1-20, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.475" | 13/64" | 13/64" | MS21209F1-25, NASM21209 | 1 | 000000000 | 000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.57" | 13/64" | 13/64" | MS21209F1-30, NASM21209 | 1 | 000000000 | 000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 12-24 | 0.216" | No. 1 | 0.228" | MS21209C2-10, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 12-24 | 0.324" | No. 1 | 0.228" | MS21209C2-15, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 1/4" | H | 0.266" | MS21209C4-10, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 3/8" | H | 0.266" | MS21209C4-15, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 1/2" | H | 0.266" | MS21209C4-20, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 5/8" | H | 0.266" | MS21209C4-25, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 3/4" | H | 0.266" | MS21209C4-30, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-28 | 1/4" | 6.7 mm | 6.7mm | MS21209F4-10, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-28 | 3/8" | 6.7 mm | 6.7mm | MS21209F4-15, NASM21209 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-28 | 1/2" | 6.7 mm | 6.7mm | MS21209F4-20, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-28 | 5/8" | 6.7 mm | 6.7mm | MS21209F4-25, NASM21209 | 1 | 000000000 | 000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-18 | 0.312" | Q | 0.332" | MS21209C5-10, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-18 | 0.469" | Q | 0.332" | MS21209C5-15, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-18 | 5/8" | Q | 0.332" | MS21209C5-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-24 | 0.312" | 21/64" | 21/64" | MS21209F5-10, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-24 | 0.469" | 21/64" | 21/64" | MS21209F5-15, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-24 | 5/8" | 21/64" | 21/64" | MS21209F5-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-24 | 0.781" | 21/64" | 21/64" | MS21209F5-25, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-16 | 3/8" | X | 0.397" | MS21209C6-10, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-16 | 0.562" | X | 0.397" | MS21209C6-15, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-16 | 3/4" | X | 0.397" | MS21209C6-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-24 | 3/8" | 25/64" | 25/64" | MS21209F6-10, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-24 | 0.562" | 25/64" | 25/64" | MS21209F6-15, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-24 | 3/4" | 25/64" | 25/64" | MS21209F6-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 3/8"-24 | 0.938" | 25/64" | 25/64" | MS21209F6-25, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 7/16"-14 | 0.438" | 29/64" | 29/64" | MS21209C7-10, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 7/16"-14 | 0.656" | 29/64" | 29/64" | MS21209C7-15, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 7/16"-14 | 7/8" | 29/64" | 29/64" | MS21209C7-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 7/16"-20 | 0.438" | 29/64" | 29/64" | MS21209F7-10, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 7/16"-20 | 0.656" | 29/64" | 29/64" | MS21209F7-15, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 7/16"-20 | 7/8" | 29/64" | 29/64" | MS21209F7-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-13 | 1/2" | 17/32" | 17/32" | MS21209C8-10, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-13 | 3/4" | 17/32" | 17/32" | MS21209C8-15, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-13 | 1" | 17/32" | 17/32" | MS21209C8-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-13 | 1 1/4" | 17/32" | 17/32" | MS21209C8-25, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-20 | 1/2" | 33/64" | 33/64" | MS21209F8-10, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-20 | 3/4" | 33/64" | 33/64" | MS21209F8-15, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-20 | 1" | 33/64" | 33/64" | MS21209F8-20, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/2"-20 | 1 1/4" | 33/64" | 33/64" | MS21209F8-25, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 9/16"-12 | 0.562" | 19/32" | 19/32" | MS21209C9-10, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 9/16"-12 | 0.844" | 19/32" | 19/32" | MS21209C9-15, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 9/16"-18 | 0.562" | 37/64" | 37/64" | MS21209F9-10, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 9/16"-18 | 0.844" | 37/64" | 37/64" | MS21209F9-15, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 5/8"-11 | 5/8" | 21/32" | 21/32" | MS21209C1010, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 5/8"-11 | 0.938" | 21/32" | 21/32" | MS21209C1015, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 5/8"-11 | 1 1/4" | 21/32" | 21/32" | MS21209C1020, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 5/8"-18 | 5/8" | 41/64" | 41/64" | MS21209F1010, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 5/8"-18 | 0.938" | 41/64" | 41/64" | MS21209F1015, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 3/4"-10 | 3/4" | 25/32" | 25/32" | MS21209C1210, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 3/4"-10 | 1 1/8" | 25/32" | 25/32" | MS21209C1215, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 3/4"-10 | 1 1/2" | 25/32" | 25/32" | MS21209C1220, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 3/4"-16 | 3/4" | 49/64" | 49/64" | MS21209F1210, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 3/4"-16 | 1 1/8" | 49/64" | 49/64" | MS21209F1215, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 7/8"-9 | 7/8" | 29/32" | 29/32" | MS21209C1410, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 7/8"-14 | 7/8" | 57/64" | 57/64" | MS21209F1410, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 7/8"-14 | 1.312" | 57/64" | 57/64" | MS21209F1415, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 1"-8 | 1" | 1 1/32" | 1 1/32" | MS21209C1610, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 1"-8 | 1 1/2" | 1 1/32" | 1 1/32" | MS21209C1615, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 1"-12 | 1" | 1 1/32" | 1 1/32" | MS21209F1610, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 1 1/4"-7 | 1 7/8" | 1 19/64" | 1 19/64" | MS21209C2015, NASM21209 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
Lubricated Stainless Steel Screw-Locking Helical Inserts
A dry film keeps the screw from sticking or binding in these inserts during installation, yet a distorted thread grips the screw to resist loosening. 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.
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. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | |||||||||||||||
| 2-56 | 0.086" | No. 41 | 0.096" | MS21209C0210L, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
| 2-56 | 0.129" | No. 41 | 0.096" | MS21209C0215L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 2-56 | 0.172" | No. 41 | 0.096" | MS21209C0220L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 4-40 | 0.112" | No. 31 | 0.12" | MS21209C0410L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.168" | No. 31 | 0.12" | MS21209C0415L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 4-40 | 0.224" | No. 31 | 0.12" | MS21209C0420L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 6-32 | 0.138" | No. 25 | 0.1495" | MS21209C0610L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-32 | 0.207" | No. 25 | 0.1495" | MS21209C0615L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 6-32 | 0.276" | No. 25 | 0.1495" | MS21209C0620L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
| 10-24 | 0.285" | No. 5 | 0.2055" | MS21209C1-15L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.19" | 13/64" | 13/64" | MS21209F1-10L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.285" | 13/64" | 13/64" | MS21209F1-15L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 10-32 | 0.38" | 13/64" | 13/64" | MS21209F1-20L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 3/8" | H | 0.266" | MS21209C4-15L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 1/4"-20 | 1/2" | H | 0.266" | MS21209C4-20L, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-18 | 0.469" | Q | 0.332" | MS21209C5-15L, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| 5/16"-18 | 5/8" | Q | 0.332" | MS21209C5-20L, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |