Key Locking Thread Insert
Product Overview
Key Locking Thread Inserts, also known as key-locking threaded inserts or keenserts, are high-strength fasteners designed to provide strong and permanent threaded holes in softer materials like aluminum, magnesium, and composites. They offer excellent resistance to torque-out and pull-out, making them ideal for high-stress fastening applications. At Flybear Fastener, we provide a wide range of high-quality key locking thread inserts that meet international standards and customer-specific requirements.

Product Specification Table
| Parameter | Value |
|---|---|
| Product Name | Key Locking Thread Insert |
| Type | Standard, Heavy Duty, Miniature |
| Drive Style | Internal Threaded |
| Material Options | Stainless Steel, Carbon Steel |
| Finish | Passivated, Zinc Plated |
| Installation Method | Mechanical Locking with Keys |
| Size Range | M4 – M24 / 4-40 to 1-1/2 |
Technical Parameters Table
| Feature | Specification |
|---|---|
| Thread Type | UNC, UNF, Metric |
| Locking Mechanism | Mechanical Keys |
| Tensile Strength | Up to 150,000 PSI |
| Temperature Resistance | Up to 800°F (427°C) |
| Installation Torque | Varied per size |
| Application Tools | Installation Tool/Drill/Jig |
Materials & Manufacturing Process
Key Locking Thread Inserts are typically made from premium-grade stainless steel (303, 304, or 316 series) or high-strength carbon steel to ensure robust mechanical properties and environmental resistance. The raw material undergoes a turning process where precise machining ensures the inner threading and precision-hole diameter. The keys are inserted post-threading for mechanical locking. Advanced surface treatment such as passivation or zinc plating enhances corrosion resistance.
Our manufacturing process includes:
- Raw material inspection
- CNC machining with strict tolerance control
- Thread rolling and deburring
- Mechanical key assembly
- Surface finishing
- 100% quality inspection before packaging
Common Industries and Applications
Key locking threaded inserts are widely used in critical engineering sectors that demand high-strength fasteners and resistance to wear, heat, and vibration. Typical industries include:
- Aerospace & Aviation
- Automotive Manufacturing
- Military & Defense Equipment
- Electronic Enclosures
- Heavy Machinery & Hydraulic Systems
- Marine Applications
- Industrial Equipment Repair & Maintenance
They are especially useful for restoring damaged threads or reinforcing new threads in soft base materials such as aluminum.
Product Advantages and Market Competitiveness
Our Key Locking Thread Inserts deliver unbeatable performance due to their engineered design and material strength.
Key Advantages:
- Premium Material: We utilize corrosion-resistant stainless steel and high-tensile carbon steel for maximum strength and longevity.
- Precision Fit: State-of-the-art CNC machines ensure micro-level tolerance and perfect thread alignment for ease of installation and long-term reliability.
- Superior Surface Treatment: Coatings like passivation and zinc plating offer enhanced resistance in corrosive environments, ideal for marine and chemical applications.
- Strong Customization Capabilities: We support custom manufacturing based on client-supplied drawings or specialized application requirements.
- Large Inventory & Timely Delivery: Our warehouse is fully stocked, ensuring consistent availability and on-time shipping.
- End-to-End Support: We offer comprehensive technical assistance from selection to post-sale, ensuring smooth integration.
Company Inspection and Quality Control
At Flybear Fastener, quality is embedded in every step of our process. All fastener products, including our key locking thread inserts, are rigorously tested for functionality, dimensional accuracy, tensile strength, and corrosion resistance. Our quality control whether incoming, in-process, or final inspection, strictly follows ISO 9001 and AS9100 guidelines.
Advanced lab equipment such as salt spray test machines, hardness testers, and 3D profile monitors ensures every batch leaving our facility meets or exceeds industry standards.
Selection and Purchasing Guide
When selecting a key locking thread insert, consider the following factors:
- Type of base material (soft, hard, metal, plastic)
- Thread sizes (metric or imperial)
- Load requirements (tensile and shear)
- Environmental conditions (temperature, humidity, chemical exposure)
- Type of application (repair, reinforcement, new assembly)
If unsure, customers are encouraged to contact us for technical support or to receive a quote tailored to your needs.
Conclusion and Company Promotion
Key Locking Thread Inserts are the smart choice for engineers and technicians seeking secure and high-load threaded connections, especially in high-stress and soft material applications. Our products provide industry-leading precision, durability, and corrosion resistance.
At Flybear Fastener, we always follow the principle of “Quality First, Customer First”, and we are committed to delivering high-performance fastener products and one-stop fastening solutions. Explore our full product catalog, and don’t hesitate to contact us for an industry-specific solution and competitive pricing.








