High-Strength Key Locking Thread Inserts
Key Locking Threaded Inserts
Key locking threaded insert is a special fastener with threads inside and outside, and 4 or 2 latch keys on the outer thread. The key locking threaded insert is inserted into the bottom hole after tapping, and then the bolt is pressed in to achieve a strong fastening effect.
Key Benefits (Icon + Bullet Points)
🔒 100% Rotation Proof: Key-locking tab bites into base material
🚀 Extreme Load Capacity: 300% higher shear strength vs. standard inserts
3-Minute Installation: No special tools beyond standard STI kits
📈 Zero Maintenance: Eliminates thread re-tapping costs
Structure of Key locking thread insert
1.2 to 4 fixed keys
2. The sheath material is C1215 steel and is treated with phosphate rust prevention
3. The fixed key is made of 302 stainless seel
4. Easy to install and disassemble
5. The toolbox contains a complete set of products
Installation Workflow (5-Step Visual)
1. Drill: Oversized hole per chart (e.g., M6 → 6.7mm)
2. Tap: Standard STI tap (included in kit)
3. Insert: Screw in until 1.5 threads exposed
4. Lock: Drive key into slot with punch tool
5. Break Tang: Remove with pliers
⚠️ Critical: Key must align perpendicular to load direction
Key locking Thread Insert Parameters
|
Product name |
Key locking thread insert |
|
Model Number |
M10 * 1.5 - 14mm |
|
Surface color |
None / Black anodised (carbon steel) |
|
Tolerances |
±.010 inch unless specified otherwise |
|
Internal Threads |
Per SAE AS8879 |
|
Dimensions |
All dimensions below are in inches |
|
Keys |
Inserts with an internal thread size of 5/16 and larger are furnished with 4 locking keys. Smaller sizes have 2 locking keys. |
|
Material Identification Mark |
None |
|
Lubrication |
Dry Film Lube on Self-locking Inserts only |
|
Performance |
MIL-I-45914A(MS51830＆NAS1394) |
|
Metric size -Thin wall key locking thread insert |
|||||||
|
Internal Thread
|
External Thread |
Length (mm) |
Tap Drill (mm) |
Thread Tap (mm) |
Tap Depth (mm) |
Removal Dril (mm) |
Removal Depth (mm) |
|
M5×0.8 |
M8×1.25 |
8.0 |
6.9 |
M8×1.25 |
9.5 |
5.50 |
4.00 |
|
M6×1.0 |
M10×1.25 |
10.0 |
8.8 |
M10×1.25 |
11.5 |
7.50 |
4.75 |
|
M8×1.25 |
M12×1.25 |
12.0 |
10.8 |
M12×1.25 |
13.5 |
9.50 |
4.75 |
|
M8×1.0 |
M12×1.25 |
12.0 |
10.8 |
M12×1.25 |
13.5 |
9.50 |
4.75 |
|
M10×1.5 |
M14×1.5 |
14.0 |
12.8 |
M14×1.5 |
15.5 |
11.50 |
4.75 |
|
M10×1.25 |
M14×1.5 |
14.0 |
12.8 |
M14×1.5 |
15.5 |
11.50 |
4.75 |
|
M12×1.75 |
M16×1.5 |
16.0 |
14.75 |
M16×1.5 |
17.5 |
13.50 |
4.75 |
|
M12×1.25 |
M16×1.5 |
16.0 |
14.75 |
M16×1.5 |
17.5 |
13.50 |
4.75 |
|
Metric size -Heavy duty key locking thread insert |
|||||||
|
Internal Thread
|
External Thread |
Length (mm) |
Tap Drill (mm) |
Thread Tap (mm) |
Tap Depth (mm) |
Removal Dril (mm) |
Removal Depth (mm) |
|
M4×0.7 |
M8×1.25 |
8.0 |
6.9 |
M8×1.25 |
9.5 |
5.50 |
4.00 |
|
M5×0.8 |
M10×1.25 |
10.0 |
8.8 |
M10×1.25 |
12.5 |
7.50 |
4.75 |
|
M6×1.0 |
M12×1.25 |
12.0 |
10.8 |
M12×1.25 |
14.5 |
9.50 |
4.75 |
|
M8×1.25 |
M14×1.5 |
14.0 |
12.8 |
M14×1.5 |
16.5 |
11.50 |
4.75 |
|
M8×1.0 |
M14×1.5 |
14.0 |
12.8 |
M14×1.5 |
16.5 |
11.50 |
4.75 |
|
M10×1.5 |
M16×1.5 |
16.0 |
14.75 |
M16×1.5 |
18.5 |
13.50 |
4.75 |
|
M10×1.25 |
M16×1.5 |
16.0 |
14.75 |
M16×1.5 |
18.5 |
13.50 |
4.75 |
|
M12×1.75 |
M18×1.5 |
18.0 |
16.75 |
M18×1.5 |
20.5 |
15.50 |
4.75 |
|
M12×1.25 |
M18×1.5 |
18.0 |
16.75 |
M18×1.5 |
20.5 |
15.50 |
4.75 |
|
M14×2.0 |
M20×1.5 |
20.0 |
18.75 |
M20×1.5 |
22.5 |
17.50 |
4.75 |
|
M14×1.5 |
M20×1.5 |
20.0 |
18.75 |
M20×1.5 |
22.5 |
17.50 |
4.75 |
|
M16×2.0 |
M22×1.5 |
22.0 |
20.5 |
M22×1.5 |
24.5 |
17.75 |
6.35 |
|
M16×1.5 |
M22×1.5 |
22.0 |
20.5 |
M22×1.5 |
24.5 |
17.75 |
6.35 |
|
M18×1.5 |
M24×1.5 |
24.0 |
22.5 |
M24×1.5 |
26.5 |
19.75 |
6.35 |
|
M20×2.5 |
M30×2.0 |
30.0 |
28.0 |
M30×2.0 |
34.5 |
25.75 |
6.35 |
|
M20×1.5 |
M30×2.0 |
30.0 |
28.0 |
M30×2.0 |
34.5 |
25.75 |
6.35 |
|
M22×1.5 |
M32×2.0 |
32.0 |
30.0 |
M32×2.0 |
36.5 |
27.75 |
6.35 |
|
M24×3.0 |
M33×2.0 |
33.0 |
31.0 |
M33×2.0 |
37.5 |
28.75 |
6.35 |
|
M24×2.0 |
M33×2.0 |
33.0 |
31.0 |
M33×2.0 |
37.5 |
28.75 |
6.35 |