Key locking thread insert--Stainless Steel Key Insert Key locking thread insert
Key locking thread insert
◆ Particularly suitable for applications requiring high-strength internal threads, which can effectively resist vibration and pulling;
◆ Relative to the ordinary stainless steel wire thread insert, it can make the strength of the threaded hole more effectively enhanced;
◆Key locking thread insert are available in carbon steel and stainless steel, with both metric and imperial sizes;
◆ Simple to use, easy to install and operate.

Key locking thraed insert Product Classification
According to the shape and structure of the Key locking thread insert, the key locking thread insert be divided into two types: normal type and locking type.
The locking effect of the key lock thread insert is excellent and its key pin can fix it on the installed object. It is especially suitable for high-intensity vibration environment and can effectively resist earthquakes

On the basis of the none-locking type key loking insert, alocking slot is designed for the self-locking keylockinginsert, which makes its performance more superior.

Key locking Thread Insert Parameters
Product name |
Key locking thread insert |
Material |
SUS303/Carbon steel |
Surface color |
None / Black anodised (carbon steel) |
Thread type |
Metric,Inc UNC, UNF |
Heavy duty |
M4~M24/8#-32UNC~3/4”-10UNC |
Light weight |
M2~M12/2#-56UNC~1/2”-13UNC |
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 |
Inch 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) |
10-24 |
5/16-18 |
7.9 |
6.4 |
5/16-18 |
9.4 |
5.50 |
4.00 |
10-32 |
5/16-18 |
7.9 |
6.4 |
5/16-18 |
9.4 |
5.50 |
4 |
1/4-20 |
3/8-16 |
9.4 |
7.8 |
3/8-16 |
10.9 |
7.10 |
4.8 |
1/4-28 |
3/8-16 |
9.4 |
7.8 |
3/8-16 |
10.9 |
7.10 |
4.8 |
5/16-18 |
7/16-14 |
10.9 |
9.1 |
7/16-14 |
12.4 |
8.70 |
4.8 |
5/16-24 |
7/16-14 |
10.9 |
9.1 |
7/16-14 |
12.4 |
8.70 |
4.8 |
3/8-16 |
1/2-13 |
12.7 |
11.5 |
1/2-13 |
14.2 |
10.30 |
4.8 |
3/8-24 |
1/2-13 |
12.7 |
11.5 |
1/2-13 |
14.2 |
10.30 |
4.8 |
7/16-14 |
9/16-12 |
14.2 |
13.1 |
9/16-12 |
15.7 |
11.90 |
4.8 |
7/16-20 |
9/16-12 |
14.2 |
13.1 |
9/16-12 |
15.7 |
11.90 |
4.8 |
1/2-13 |
5/8-11 |
15.7 |
14.7 |
5/8-11 |
17.2 |
13.50 |
4.8 |
1/2-20 |
5/8-11 |
15.7 |
14.7 |
5/8-11 |
17.2 |
13.50 |
4.8 |
Inch 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) |
8-32 |
5/16-18 |
7.9 |
6.4 |
5/16-18 |
9.4 |
5.50 |
4.00 |
10-24 |
3/8-16 |
7.9 |
6.4 |
3/8-16 |
9.4 |
7.10 |
4.8 |
10-32 |
3/8-16 |
7.9 |
6.4 |
3/8-16 |
9.4 |
7.10 |
4.8 |
1/4-20 |
7116-14 |
9.4 |
9.1 |
7/16-14 |
10.9 |
8.70 |
4.8 |
1/4-28 |
7/16-14 |
9.4 |
9.1 |
7/16-14 |
10.9 |
8.70 |
4.8 |
5/16-18 |
1/2-13 |
10.9 |
11.5 |
1/2-13 |
12.4 |
10.30 |
4.8 |
5/16-24 |
1/2-13 |
10.9 |
11.5 |
1/2-13 |
12.4 |
10.30 |
4.8 |
3/8-16 |
9/16-12 |
12.7 |
13.1 |
9/16-12 |
14.2 |
11.90 |
4.8 |
3/8-24 |
9/16-12 |
12.7 |
13.1 |
9/16-12 |
14.2 |
11.90 |
4.8 |
7/16-14 |
5/8-11 |
15.7 |
14.7 |
5/8-11 |
17.2 |
13.50 |
4.8 |
7/16-20 |
5/8-11 |
15.7 |
14.7 |
5/8-11 |
17.2 |
13.50 |
4.8 |
1/2-13 |
3/4-16 |
15.7 |
17.8 |
3/4-16 |
17.2 |
16.6 |
4.8 |
1/2-20 |
3/4-16 |
15.7 |
17.8 |
3/4-16 |
17.2 |
16.6 |
4.8 |
9/16-12 |
3/4-16 |
20.6 |
17.8 |
3/4-16 |
22.1 |
16.6 |
4.8 |
9/16-18 |
3/4-16 |
20.6 |
17.8 |
3/4-16 |
22.1 |
16.6 |
4.8 |
5/8-11 |
718-14 |
22.0 |
21.0 |
7/8-14 |
23.5 |
19.8 |
4.8 |
5/8-18 |
7/8-14 |
22.0 |
21.0 |
7/8-14 |
23.5 |
19.8 |
4.8 |
Product Installation Steps
1. Drilling - the base piece for drilling, the depth of its drilling must be greater than the depth of the Key locking thread insert, the selected drilling bit must be matched with the Key locking thread insert, the hole can not be drilled crooked.
2.Tapping - tapping screw holes, the length of the tapping must be longer than the length of the Key locking thread insert, if it is a through hole should be fully tapped. The accuracy of the screw hole screw teeth can be used threaded low-hole plug gauge for screw hole detection.
3. Screw in - the Key locking thread insert into the installation of the key locking thread insert into the tapped screw holes, and require the key locking thread insert must be slightly below the surface of the product fittings.
4.Pressed in - the use of tools to the key locking thread insert pin key pressed into the screw hole.

Application of key locking thread insert
The most basic function of the Key Locking Threaded Inserts is to repair and strengthen the internal thread, which can quickly and effectively repair the damaged thread. When applied to low strength materials, it can greatly enhance the strength of the threaded hole.

Part of the application industry display
