Experience reliable thread restoration with LockingInsert Thread Repair Kit. Engineered with premium stainless steel inserts and precision tools, it provides a professional-grade solution trusted by industrial and automotive experts worldwide. Every repair ensures long-lasting strength, superior thread engagement, and peace of mind.
Material & Manufacturing Process
Premium Stainless Steel Inserts: Resistant to corrosion, wear, and high temperatures.
Hardened STI Taps: Optimized for smooth cutting and accurate thread formation.
High-Quality Drill Bits & Installation Tools: Precision-made for repeatable, reliable repair.
All components are manufactured under ISO-compliant processes, ensuring consistent quality and safety across multiple batches. Our wire-form inserts feature a diamond-shaped cross-section for maximum strength and thread engagement.
Core Functionality
Permanent Thread Restoration: Restore damaged threads to their full strength.
Stress Distribution Optimization: Distributes load evenly to prevent localized failure.
Wide Material Compatibility: Works with aluminum, iron, carbon steel, bronze, stainless steel, and cast materials.
Cost-Efficient: Reduces the need to replace expensive components.
Easy Installation: Complete kit with step-by-step instructions for minimal training requirements.
135° Top Angle Design
Adopt 135° top angle design, sharp and labor-saving, to ensure the positioning of high-speed steel in the drilling hole.
12.4 & HSS
12.4 means that the diameter of the twist drill bit is 12.4mm, hss means that the material is hss stainless steel.
ST12*1.5 & HSS
ST12*1.5 means that the type of the cutting tap is m12*1.5, hss means that the material is hss stainless steel.
High Quality Thread
The cutting tap is made of hss stainless steel, protect and maintain good threading from wear and tear.
Breaking Tool
This tool snaps the tang off the end of the insert once it is in and locked in place.
Perfect Packaging & Instructions
Storage box helps you quickly organize your tools, the instruction manual helps you use the tool easily.
Installation Tool
The installation tool finds the depth of the hole and fits each insert snugly into position.
Use Cases / Applications
The LockingInserts Thread Repair Kit is designed for applications requiring reliable thread strength, durability, and long-term performance. Its effectiveness is supported by established engineering practices and recognized testing standards.
Automotive Engine & Powertrain Repair
Widely used in aluminum components such as cylinder heads and spark plug threads.
Performance is typically verified through ISO 898-2 and torque testing to ensure reliable load-bearing capacity and resistance to stripping.
Heavy Machinery & Industrial Equipment
Suitable for high-load and high-vibration environments.
Performance is evaluated using DIN 267 and pull-out strength testing to ensure secure fastening.
Mold & Tooling Repair
Helps restore damaged threads in molds and tooling without replacement.
Verified through thread gauge inspection (GO/NO-GO) and repeated assembly cycle testing.
Technical Assurance
All Lockinginserts thread repair kits are designed to comply with international thread standards (Metric, UNC, UNF) and follow standardized installation practices to ensure consistent and reliable results.
Product Specification
|
Nominal Diameter |
Pitch |
Nominal Length xD L |
Coil (W) |
Free-State OD(D) |
Drill Bit Diameter(do) |
Drilling Depth(L3) |
Actual Effective Length (L2) |
|
|
M3 |
0.5 |
1D |
3.0 |
3.9 |
3.80~4.00 |
3.1 |
5.0 |
2.5 |
|
1.5D |
4.5 |
6.3 |
6.5 |
4.0 |
||||
|
2D |
6.0 |
8.7 |
8.0 |
5.5 |
||||
|
2.5D |
7.5 |
11.1 |
9.5 |
7.0 |
||||
|
3D |
9.0 |
13.5 |
11.0 |
8.5 |
||||
|
M4 |
0.7 |
1D |
4.0 |
3.7 |
5.05~5.25 |
4.2 |
6.8 |
3.3 |
|
1.5D |
6.0 |
6.1 |
8.8 |
5.3 |
||||
|
2D |
8.0 |
8.4 |
10.8 |
7.3 |
||||
|
2.5D |
10.0 |
10.9 |
12.8 |
9.3 |
||||
|
3D |
12.0 |
13.2 |
14.8 |
11.3 |
||||
|
M5 |
0.8 |
1D |
5.0 |
4.3 |
6.35~6.60 |
5.2 |
8.2 |
4.2 |
|
1.5D |
7.5 |
6.9 |
10.7 |
6.7 |
||||
|
2D |
10.0 |
9.7 |
13.2 |
9.2 |
||||
|
2.5D |
12.5 |
12.3 |
15.7 |
11.7 |
||||
|
3D |
15.0 |
14.8 |
18.2 |
14.2 |
||||
|
M6 |
1 |
1D |
6.0 |
4.2 |
7.60~7.85 |
6.3 |
10.0 |
5.0 |
|
1.5D |
9.0 |
6.9 |
13.0 |
8.0 |
||||
|
2D |
12.0 |
9.6 |
16.0 |
11.0 |
||||
|
2.5D |
15.0 |
12.3 |
19.0 |
14.0 |
||||
|
3D |
18.0 |
14.6 |
22.0 |
17.0 |
||||
|
M8 |
1.25 |
1D |
8.0 |
4.7 |
9.85~10.10 |
8.3 |
13.0 |
6.8 |
|
1.5D |
12.0 |
7.4 |
17.0 |
10.8 |
||||
|
2D |
16.0 |
10.6 |
21.0 |
14.8 |
||||
|
2.5D |
20.0 |
13.5 |
25.0 |
18.8 |
||||
|
3D |
24.0 |
16.4 |
29.0 |
22.8 |
||||
|
M8 |
1 |
1D |
8.0 |
6.1 |
9.85~10.10 |
8.3 |
12.0 |
7.0 |
|
1.5D |
12.0 |
9.5 |
16.0 |
11.0 |
||||
|
2D |
16.0 |
12.9 |
20.0 |
15.0 |
||||
|
2.5D |
20.0 |
16.5 |
24.0 |
19.0 |
||||
|
3D |
24.0 |
19.9 |
28.0 |
23.0 |
||||
|
M10 |
1.5 |
1D |
10.0 |
5.0 |
12.10~12.50 |
10.4 |
16.0 |
8.5 |
|
1.5D |
15.0 |
8.1 |
21.0 |
13.5 |
||||
|
2D |
20.0 |
11.2 |
26.0 |
18.5 |
||||
|
2.5D |
25.0 |
14.2 |
31.0 |
23.5 |
||||
|
3D |
30.0 |
17.2 |
36.0 |
28.5 |
||||
|
M10 |
1.25 |
1D |
10.0 |
6.0 |
12.10~12.50 |
10.3 |
15.0 |
8.8 |
|
1.5D |
15.0 |
9.7 |
20.0 |
13.8 |
||||
|
2D |
20.0 |
13.1 |
25.0 |
18.8 |
||||
|
2.5D |
25.0 |
16.9 |
30.0 |
23.8 |
||||
|
3D |
30.0 |
20.1 |
35.0 |
28.8 |
||||
|
M10 |
1 |
1D |
10.0 |
7.6 |
12.10~12.50 |
10.3 |
14.0 |
9.0 |
|
1.5D |
15.0 |
12.1 |
19.0 |
14.0 |
||||
|
2D |
20.0 |
16.3 |
24.0 |
19.0 |
||||
|
2.5D |
25.0 |
20.7 |
29.0 |
24.0 |
||||
|
3D |
30.0 |
25.0 |
34.0 |
29.0 |
||||
Lead Time & Shipping
The LockingInserts Thread Repair Kit is shipped worldwide with care to ensure all components arrive fully functional and ready to use.
Standard Lead Time:
Stocked kits: 5–7 business days from order confirmation
Custom or bulk orders: 10–15 business days depending on specifications
Shipping Options:
Air Freight: Fast and trackable for urgent orders
Sea Freight: Cost-effective for large shipments
Courier Services: DHL, FedEx, UPS with real-time tracking
Packaging & Protection:
Secure, moisture-proof, and anti-corrosion packaging
Designed to prevent damage during transport
Our Service Advantage
At LockingInserts Tech we provide more than premium Thread Repair Kits - we offer complete support for your projects.
Pre-Sales Support: Expert guidance to choose the right kit for your materials and applications.
Installation Assistance: Clear instructions, video tutorials, and on-demand help for smooth installation.
After-Sales Service: Warranty, replacement for defective parts, and global shipping support.
Experience & Reliability: Over 17+ years in thread repair manufacturing, trusted by partners worldwide.
Key Benefits:
Reduce downtime with fast technical support.
Ensure thread integrity and long-term performance.
Access expert knowledge and reliable logistics for global orders.
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