Metric Key-Locking Thread Inserts for Metal Thread Repair
Industrial Thread Repair Solution with Vibration Resistance, Compatible with Multiple Thread Sizes
The pin-type thread insert is a special fastener with threads both inside and outside, and four or two pin keys on the external thread. The pin-type thread insert is inserted into the bottom hole after tapping, and then the two or four pins are pressed in to achieve a strong fastening effect.
The product is mainly used in aerospace, railway locomotives, vibrating machinery and other products with high requirements for thread strength. The most basic function of the pin-type thread insert is to repair and enhance the internal thread. As a means of thread repair, the pin-type thread insert can quickly and effectively repair the damaged thread. When applied to materials with low strength, the pin-type thread insert can greatly enhance the strength of the threaded hole.
Key-locking insert is available in carbon and stainless steel, both inch and metric series, and are supplied in Thinwall, Heavy Duty, Extra Heavy Duty, Solid style and Self-Locking styles.They are offered individually or in kits.
Basic Info
|
Model No. |
Lightweight, Heavy Duty, Extra Heavy Duty |
|
Usage |
Machinery, Medical, Aereospace, Rail System |
|
Rotation Direction |
Right Rotation |
Surface Finishing |
Nickel Plated |
|
|
Certification |
ISO2001:2015, RoHs, REACH |
Customized |
Supports customization |
|
|
Shape |
Two Kees, Four Kees |
Temperature Tolerance |
932 Fahrenheit to 1382 Fahrenheit |
|
|
Precision Grade |
6H |
Classfication |
Thin Wall or Thick Wall |
|
|
Transport Package |
PE Package, Carton |
Specification |
M2-M24 |
|
|
Trademark |
XXX |
Origin |
Shenzhen, China |
|
|
HS Code |
7318190000 |
Product Capacity |
300000 Pieces/ Week |
Features
-
Installed with standard drills and taps
-
Easy installation
-
May be used in a variety of materials: Aluminum, Magnesium, cold rolled steel
-
Easy to remove
-
Passivated to enhance corrosion-resistance and finish
Related Product
Metric Key Locking Inserts Parameters
|
Spec. Lightweight |
ID. B |
Inner Thread Pitch |
Length L |
OD. A |
Outer Thread Pitch |
Bottom Hole |
Drilling Depth |
|
M2*0.4-L3-M4*0.7 |
M2 |
0.4 |
3 |
M4 |
0.7 |
3.4 |
4 |
|
M2.5*0.45-L3.8-M4.5*0.75 |
M2 |
0.45 |
3.8 |
M4.5 |
0.75 |
3.9 |
5 |
|
M3*0.45-L4.25-M5*0.8 |
M3 |
0.5 |
4.25 |
M5 |
0.8 |
4.4 |
5.5 |
|
M4*0.7-L5.25-M6*0.75 |
M4 |
0.7 |
5.25 |
M6 |
0.75 |
5.5 |
6.5 |
|
M5*0.8-L8-M8*1.25 |
M5 |
0.8 |
8 |
M8 |
1.25 |
6.9 |
9.5 |
|
M6*1.0-L10-M12*1.25 |
M6 |
1 |
10 |
M10 |
1.25 |
8.9 |
11.5 |
|
M8*1.25-L12-M12*1.25 |
M8 |
1.25 |
12 |
M12 |
1.25 |
10.9 |
13.5 |
|
M10*1.5-L14-M14*1.5 |
M10 |
1.5 |
14 |
M14 |
1.5 |
12.80 |
15.5 |
|
M10*1.25-L14-M14*1.5 |
M10 |
11.25 |
14 |
M14 |
1.5 |
12.80 |
15.5 |
|
M12*1.75-L16-M16*1.5 |
M12 |
1.75 |
16 |
M16 |
1.5 |
14.75 |
17.5 |
|
M12*1.5-L16-M16.15 |
M12 |
1.5 |
16 |
M16 |
1.5 |
14.75 |
17.5 |
|
M12*1.25-L16-M16*1.5 |
M12 |
1.25 |
16 |
M16 |
1.5 |
14.75 |
17.5 |
|
Spec. Heavy Duty |
ID. B |
Inner Thread Pitch |
Length L |
OD. A |
Outer Thread Pitch |
Bottom Hole |
Drilling Depth |
|
M4*0.7-L8-M8*1.25 |
M4 |
0.7 |
8 |
M8 |
1.25 |
6.9 |
9.5 |
|
M5*0.8-L10-M10*1.25 |
M5 |
0.8 |
10 |
M10 |
1.25 |
8.9 |
12.5 |
|
M6*1.0-L12-M12*1.25 |
M6 |
1.0 |
12 |
M12 |
1.25 |
10.9 |
14.5 |
|
M8*1.25-L14-M14*1.5 |
M8 |
1.25 |
14 |
M14 |
1.5 |
12.8 |
16.5 |
|
M8*1.0-L14-M14*1.5 |
M8 |
1.0 |
14 |
M14 |
1.5 |
12.8 |
16.5 |
|
M10*1.5-L16-M16*1.5 |
M10 |
1.5 |
16 |
M16 |
1.5 |
14.75 |
18.5 |
|
M10*1.25-L16-M16*1.5 |
M10 |
1.25 |
16 |
M16 |
1.5 |
14.75 |
18.5 |
|
M12*1.75-L18-M18*1.5 |
M12 |
1.75 |
18 |
M18 |
1.5 |
16.75 |
20.5 |
|
M12*1.25-L18-M18*1.5 |
M12 |
1.25 |
18 |
M18 |
1.5 |
16.75 |
20.5 |
|
M14*2.0-L20-M20*1.5 |
M14 |
2.0 |
20 |
M20 |
1.5 |
18.75 |
22.5 |
|
M14*1.5-L20-M20*1.5 |
M14 |
1.5 |
20 |
M20 |
1.5 |
18.75 |
22.5 |
|
M16*2.0-L22-M22*1.5 |
M16 |
2.0 |
22 |
M22 |
1.5 |
20.70 |
24.5 |
|
M16*1.5-L22-M22*1.5 |
M16 |
1.5 |
22 |
M22 |
1.5 |
20.70 |
24.5 |
|
M18*1.5-L24-M24*1.5 |
M18 |
1.25 |
24 |
M24 |
1.5 |
22.70 |
26.5 |
|
M20*2.5-L30-M30*2.0 |
M20 |
2.2 |
30 |
M30 |
2.0 |
28.20 |
34.5 |
|
M20*1.5-L30-M30*2.0 |
M20 |
1.5 |
30 |
M30 |
2.0 |
28.20 |
34.5 |
|
M22*1.5-L32-M32*2.0 |
M22 |
1.75 |
32 |
M32 |
2.0 |
30.2 |
36.5 |
|
M24*3.0-L33-M33*2.0 |
M24 |
3.0 |
33 |
M33 |
2.0 |
31.2 |
37.5 |
|
M24*2.0-L33-M33*2.0 |
M24 |
2.0 |
33 |
M33 |
2.0 |
31.2 |
37.5 |
Factory Workshop Display
Production Equipment
Our workshop is equipped with machines for producing key locking inserts, self-tapping inserts, and wire thread inserts.
The equipment supports forming, machining, and assembly, suitable for both standard and customized production.
Performance Testing
Torque and pull-out tests are conducted on selected products to verify basic performance under normal installation conditions. Testing machines are used to check basic mechanical performance of key locking inserts, self-tapping inserts, and wire thread inserts under normal installation conditions.Key locking inserts are tested for load and retention performance after installation.
In-Process Quality Control
Quality checks are carried out at key stages of production to monitor dimensions, thread condition, and overall part consistency. Any deviation identified during the process is corrected in a timely manner to avoid carryover into subsequent operations. These in-process inspections help maintain stable production conditions and reduce the risk of batch-level quality issues. Inspection results are used as reference data for process adjustment and final evaluation.
FAQ
Q: What's the difference between 2-key and 4-key key-locking inserts? Which one fits my application?
A: The core difference lies in anti-torsion and anti-loosening performance. 2-key inserts feature a simple structure and easy installation, suitable for low-vibration, low-load scenarios (e.g., home appliance casings, light-duty equipment connectors). 4-key inserts have evenly distributed locking keys, providing larger engagement area with the base material, which is ideal for high-vibration, heavy-load working conditions (e.g., construction machinery, engine blocks, rail transit equipment).
Q: What's the difference between thin-walled and heavy-duty key-locking inserts? How to select based on the base material?
A: Thin-wall inserts have a wall thickness of 0.3–0.8mm, featuring light weight and small space occupation, suitable for thin-wall base materials (e.g., aluminum alloy casings, sheet metal parts) to avoid base cracking during installation.
Heavy-duty inserts have a wall thickness of 1.0–2.5mm, with stronger load-bearing capacity, suitable for thick-walled base materials or high-load scenarios (e.g., carbon steel frames, mold equipment). Selection rule: thin-walled for aluminum base, heavy-duty for steel base; thin-walled for low load, heavy-duty for high load.
Q: What is the thread accuracy grade of our keenserts? How to control the tolerance of pitch and pitch diameter?
A: The thread accuracy of standard products is 6H, which meets most industrial scenarios. For precision equipment (e.g., aerospace, precision instruments), we can customize 5H accuracy. Tolerance control strictly follows international standards: pitch tolerance is ±0.01mm, pitch diameter tolerance is ±0.02mm. We adopt CNC machining + 100% thread gauge inspection during production to ensure no issues like "unable to screw in" or "excessive clearance".
Q: What is the delivery cycle for bulk orders? What transportation methods and payment terms do you support?
A: Delivery cycle: same-day shipment for stock orders; 5–9 days for standard bulk orders (10,000–100,000 pieces); 14–20 days for custom orders. Transportation methods: DHL/FedEx/UPS for small parcels; sea freight for bulk orders (FCL/LCL); air freight for urgent orders. Payment terms: T/T (70% deposit, 30% before shipment), PayPal.
Q: What installation tools do you provide? Do you offer installation guidance services?
A: For bulk orders, we provide free matching installation tools, including special drill bits, taps, installation wrenches and thread plug gauges; for small-batch orders, tools can be provided at cost price. Installation guidance services include three levels: ① Free installation videos and operation manuals (available in English, Spanish and Arabic); ② Remote video guidance for installation
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