Permanent Thread Reinforcement for High-Load and High-Vibration Applications
Key-locking thread inserts are a proven solution for creating strong, wear-resistant internal threads in soft or lightweight base materials. Designed with solid bush construction and mechanical locking keys, these inserts provide exceptional resistance to vibration, rotation, and pull-out, making them ideal for critical engineering applications.
As a professional manufacturer with over 20 years of experience in thread insert production, we supply both standard and custom key-locking inserts to global industrial customers, ensuring consistent quality, dimensional accuracy, and long-term reliability.
Key Product Attributes
- ◆ Solid one-piece threaded insert with locking keys
- ◆ Positive mechanical locking system (no adhesives required)
- ◆ Prevents loosening under vibration and cyclic loads
- ◆ Provides durable internal threads in soft materials
- ◆ Suitable for repeated assembly and disassembly
- ◆ Compatible with standard installation tools
Product Advantages
1.High Vibration Resistance
Locking keys are driven into the parent material after installation, preventing rotation and back-out even under severe vibration.
2.Superior Load Distribution
Solid body design distributes loads evenly, reducing stress concentration and extending component service life.
3.Permanent Thread Repair & Reinforcement
Ideal for repairing stripped or damaged threads and reinforcing newly machined holes.
4.Consistent Thread Accuracy
Precision machining ensures tight tolerance control and reliable engagement with standard fasteners.
Available Materials
We offer key-locking inserts in a range of materials to meet different mechanical and environmental requirements:
Special materials are available upon request.
Manufacturing Process
- CNC precision turning and threading
- Controlled heat treatment (for carbon steel inserts)
- Precision key slot machining
- Surface finishing and corrosion protection
- 100% dimensional inspection on critical parameters
- Batch traceability and quality documentation available
- Our production process follows strict quality control procedures to ensure consistency across every batch.
Product Information
|
Technical Parameters |
Description |
|
Thread Type |
Metric (M), UNC, UNF |
|
Internal Thread Size |
M2 – M24 (custom sizes available) |
|
External Thread Size |
Matched to parent material |
|
Number of Keys |
2 / 4 (depending on size) |
|
Installation Method |
Screw-in + key locking |
|
Operating Temperature |
Up to 300°C (material dependent) |
|
Standards |
Equivalent to NAS / MS / DIN specifications |
Parameter Data Sheet
Lightweight Keenserts
|
Thread Insert Size |
Installation Parameters |
Removal Parameters |
|||||||
|
Internal Thread (6H) |
External Thread (6g) |
Length |
Length T |
Tap Drill Size |
Counterbore Size |
Tap |
Drill Bit |
||
|
Model |
Depth |
Size |
Depth |
||||||
|
M2*0.4 |
M4*0.7 |
3.00 |
2.20 |
3.40 |
4.10 |
M4*0.7 |
4.0 |
2.70 |
2.00 |
|
M2.5*0.45 |
M4.5*0.75 |
3.80 |
2.70 |
3.90 |
4.60 |
M4.5*0.75 |
5.0 |
3.00 |
2.00 |
|
M3*0.5 |
M5*0.8 |
4.25 |
3.10 |
4.30 |
5.10 |
M5*0.8 |
5.5 |
3.50 |
2.25 |
|
M4*0.7 |
M6*0.75 |
5.25 |
4.10 |
5.40 |
6.10 |
M6*0.75 |
6.5 |
4.50 |
2.50 |
|
M5*0.8 |
M8*1.25 |
8.00 |
3.70 |
6.80 |
8.10 |
M8*1.25 |
9.00 |
5.50 |
4.00 |
|
M6*1.0 |
M10*1.25 |
10.00 |
6.00 |
8.80 |
10.10 |
M10*1.25 |
11.00 |
7.50 |
4.75 |
|
M6*0.75 |
M10*1.25 |
10.00 |
6.00 |
8.80 |
10.10 |
M10*1.25 |
11.00 |
7.50 |
4.75 |
|
M8*1.25 |
M12*1.25 |
12.00 |
6.30 |
10.80 |
12.10 |
M12*1.25 |
13.00 |
9.50 |
4.75 |
|
M8*1.0 |
M12*1.25 |
12.00 |
6.30 |
10.80 |
12.10 |
M12*1.25 |
13.00 |
9.50 |
4.75 |
|
M10*1.5 |
M14*1.5 |
14.00 |
6.50 |
12.60 |
14.10 |
M14*1.5 |
15.00 |
11.50 |
4.75 |
|
M10*1.25 |
M14*1.5 |
14.00 |
6.50 |
12.60 |
14.10 |
M14*1.5 |
15.00 |
11.50 |
4.75 |
|
M10*1.0 |
M14*1.5 |
14.00 |
6.50 |
12.60 |
14.10 |
M14*1.5 |
15.00 |
11.50 |
4.75 |
|
M12*1.75 |
M16*1.5 |
16.00 |
6.50 |
14.60 |
16.10 |
M16*1.5 |
17.00 |
13.50 |
4.75 |
|
M12*1.5 |
M16*1.5 |
16.00 |
6.50 |
14.60 |
16.10 |
M16*1.5 |
17.00 |
13.50 |
4.75 |
|
M12*1.25 |
M16*1.5 |
16.00 |
6.50 |
14.60 |
16.10 |
M16*1.5 |
17.00 |
13.550 |
4.75 |
|
M14*2.0 |
M18*1.5 |
18.00 |
7.20 |
16.60 |
18.10 |
M18*1.5 |
19.50 |
15.50 |
5.50 |
|
M14*1.5 |
M18*1.5 |
18.00 |
7.20 |
16.60 |
18.10 |
M18*1.5 |
19.50 |
15.50 |
5.50 |
|
M14*1.25 |
M18*1.5 |
18.00 |
7.20 |
16.60 |
18.10 |
M18*1.5 |
19.50 |
15.50 |
5.50 |
|
M16*2.0 |
M20*1.5 |
20.00 |
7.20 |
18.60 |
20.10 |
M20*1.5 |
21.50 |
17.50 |
5.50 |
Heavy Duty Keenserts
|
Thread Insert Size |
Installation Parameters |
Removal Parameters |
|||||||
|
Internal Thread (6H) |
External Thread (6g) |
Length |
Length T |
Tap Drill Size |
Counterbore Size |
Tap |
Drill Bit |
||
|
Model |
Depth |
Size |
Depth |
||||||
|
M4*0.7 |
M8*1.25 |
8.00 |
5.00 |
6.80 |
8.10 |
M8*1.25 |
9.00 |
5.50 |
4.00 |
|
M5*0.8 |
M10*1.25 |
10.00 |
5.50 |
8.80 |
10.10 |
M10*1.25 |
11.00 |
7.50 |
4.70 |
|
M6*1.0 |
M12*1.25 |
12.00 |
6.50 |
10.80 |
10.10 |
M12*1.25 |
13.00 |
9.50 |
5.00 |
|
M8*1.25 |
M14*1.5 |
14.00 |
6.50 |
12.60 |
12.10 |
M14*1.5 |
15.00 |
11.50 |
5.00 |
|
M8*1.0 |
M14*1.5 |
14.00 |
6.50 |
12.60 |
12.10 |
M14*1.5 |
15.00 |
11.50 |
5.00 |
|
M10*1.5 |
M16*1.5 |
16.00 |
6.50 |
14.60 |
14.10 |
M16*1.5 |
17.00 |
13.50 |
5.00 |
|
M10*1.25 |
M16*1.5 |
16.00 |
6.50 |
14.60 |
14.10 |
M16*1.5 |
17.00 |
13.50 |
5.00 |
|
M10*1.0 |
M16*1.5 |
16.00 |
6.50 |
14.60 |
14.10 |
M16*1.5 |
17.00 |
13.50 |
5.00 |
|
M12*1.75 |
M18*1.5 |
18.00 |
7.30 |
16.60 |
16.10 |
M18*1.5 |
19.00 |
15.50 |
5.00 |
|
M12*1.5 |
M18*1.5 |
18.00 |
7.30 |
16.60 |
16.10 |
M18*1.5 |
19.00 |
15.50 |
5.00 |
|
M12*1.25 |
M18*1.5 |
18.00 |
7.30 |
16.60 |
16.10 |
M18*1.5 |
19.00 |
15.50 |
5.00 |
|
M14*2.0 |
M20*1.5 |
20.00 |
7.70 |
18.60 |
18.10 |
M20*1.5 |
21.50 |
17.50 |
6.00 |
|
M14*1.5 |
M20*1.5 |
20.00 |
7.70 |
18.60 |
18.10 |
M20*1.5 |
21.50 |
17.50 |
6.00 |
|
M14*1.25 |
M20*1.5 |
20.00 |
7.70 |
18.60 |
18.10 |
M20*1.5 |
21.50 |
17.50 |
6.00 |
|
M16*2.0 |
M22*1.5 |
22.00 |
8.50 |
20.60 |
20.10 |
M22*1.5 |
23.50 |
17.80 |
7.00 |
|
M16*1.5 |
M22*1.5 |
22.00 |
8.50 |
20.60 |
20.10 |
M22*1.5 |
23.50 |
17.80 |
7.00 |
|
M18*2.5 |
M24*2.0 |
24.00 |
9.30 |
22.10 |
24.10 |
M24*2.0 |
26.00 |
19.80 |
7.00 |
|
M20*2.5 |
M30*2.0 |
30.00 |
12.50 |
28.10 |
30.10 |
M30*2.0 |
32.00 |
25.80 |
7.00 |
|
M22*2.5 |
M32*2.0 |
32.00 |
12.50 |
30.10 |
32.10 |
M32*2.0 |
34.00 |
27.80 |
7.00 |
|
M24*3.0 |
M33*2.0 |
33.00 |
14.00 |
31.10 |
33.10 |
M33*2.0 |
35.00 |
28.80 |
7.00 |
Typical Applications
Key-locking thread inserts are widely used in industries where safety, durability, and reliability are critical:
- ● Aerospace structures and components
- ● Automotive engines and transmissions
- ● Oil & gas equipment
- ● Heavy machinery and industrial equipment
- ● Defense and military hardware
- ● Rail transportation systems
They are especially recommended for aluminum, magnesium alloys, cast iron, and other soft or lightweight materials.
Our Customers
We supply key-locking thread inserts to:
1.Aerospace component manufacturers
2.Automotive Tier-1 and Tier-2 suppliers
3.Industrial OEMs
4.Maintenance, repair, and overhaul (MRO) companies
5.Authorized distributors and wholesalers
Customer references and application cases are available upon request.
FAQ
Q1: Are your inserts interchangeable with Keensert products?
Yes. Our key-locking inserts are fully interchangeable with standard Keensert-type designs and compatible with common installation tools.
Q2: Can you provide custom sizes or special materials?
Yes. We offer OEM and custom manufacturing based on drawings, specifications, or application requirements.
Q3: Do you provide samples before bulk orders?
Samples can be provided for evaluation, subject to specification and availability.
Q4: What quality control measures do you follow?
All products undergo dimensional inspection and visual checks. Material certificates and inspection reports are available upon request.
Q5: What is your typical lead time?
Standard sizes are available from stock. Custom orders typically require 2–4 weeks, depending on quantity and complexity.
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