Titanium Alloy Countersunk Head Torx Bolt

Titanium alloy countersunk head torx bolts are high-precision fasteners that combine the lightweight, corrosion-resistant, and high-strength properties of titanium alloy with the structural advantages of a countersunk head and Torx drive. They are widely used in fields requiring stringent fastening performance and environmental adaptability, such as aerospace, medical devices, marine engineering, and precision instruments.

The structural design of titanium alloy countersunk Torx bolts focuses on three main objectives: low-profile fastening, anti-loosening and tamper-proofing, and precise positioning, with each component having a clearly defined function.

Countersunk Head: The head is 90° conical in shape, perfectly fitting into the countersunk hole of the connected part. When tightened, the head is flush with the workpiece surface, with no protrusions, reducing fluid/airflow resistance and avoiding the risk of scratching. This is suitable for low-profile assembly requirements in aerospace and precision instruments.

Torx Drive: The head features a hexagonal star-shaped recess with straight walls, allowing for precise engagement with a spline wrench. Compared to Phillips/slotted screws, they offer higher torque transfer efficiency (over 90%), preventing slippage and damage to the screw; however, they require a special Torx wrench and offer some degree of tamper resistance.

Threading: Machine screw threads (M2-M20) and self-tapping threads (ST2-ST12), thread accuracy 6g (industrial grade) / 5g (precision grade). It forms a stable threaded connection with nuts or threaded holes, and combined with the elastic modulus characteristics of titanium alloy, it has strong resistance to vibration-induced loosening after tightening.

Titanium alloy countersunk Torx screws offer performance far superior to carbon steel and stainless steel screws. Their core advantages stem from the material properties of titanium alloy, as detailed below:

1. Lightweight and High Specific Strength
The density is only 4.51 g/cm³, approximately 60% of carbon steel and 56% of stainless steel. For the same specifications, the weight is reduced by 40%-50%, significantly reducing the overall weight of equipment (e.g., weight reduction in aerospace equipment directly improves range and payload).
The tensile strength can reach 800-1200 MPa (GR5 titanium alloy), far exceeding that of 304 stainless steel (520 MPa). The specific strength (strength/density) is more than twice that of high-strength steel, making it irreplaceable in lightweight fastening applications.

2. Excellent Corrosion Resistance
Titanium alloys naturally form a dense TiO₂ passivation film on their surface (thickness 5-10 nm). In corrosive environments such as seawater, strong acids (nitric acid, sulfuric acid), strong alkalis, and industrial atmospheres, the corrosion rate is ≤0.001 mm/year, far superior to stainless steel.
There is no risk of intergranular corrosion or pitting, making it suitable for the harsh corrosive environments of marine engineering and chemical equipment. It has a service life of over 30 years, eliminating the need for frequent replacement.

3. Anti-fatigue and anti-vibration performance
The elastic modulus of titanium alloy (110 GPa) is lower than that of steel, resulting in a more uniform distribution of contact stress between the threaded components after tightening. This provides excellent resistance to alternating load fatigue (fatigue strength ≥ 350 MPa, GR5 annealed state).
The high torque transmission efficiency of the spline groove prevents thread damage caused by slippage during tightening. Combined with the toughness of titanium alloy, it is less prone to loosening under vibration conditions (such as in aircraft engines and marine power systems).

4. Biocompatibility and Non-magnetic Properties (Advantages in Special Scenarios)
Medical-grade titanium alloy (TI6AL4VELI) screws are non-toxic and non-allergenic, and can be directly implanted into the human body (such as for orthopedic internal fixation and medical device assembly), complying with ISO 10993 biocompatibility standards.
Titanium alloy is a paramagnetic material with a magnetic permeability of ≤1.001, ensuring no magnetic interference. This makes it suitable for fastening applications in magnetic resonance imaging (MRI) equipment and precision magnetic measuring instruments.

1. Ti-6Al-4V: α+β type titanium alloy, Tensile strength ≥ 860 MPa, yield strength ≥ 795 MPa, elongation ≥ 10%, and excellent corrosion resistance. Ideal for industrial applications, combining strength and corrosion resistance, suitable for heavy-duty and corrosive environments.

2. Ti-6Al-4V ELI: Ultra-low gap α+β type titanium alloy, Tensile strength ≥ 820 MPa, yield strength ≥ 760 MPa, elongation ≥ 12%, biocompatibility Class A. Medical grade, with extremely low levels of interstitial elements (O/N/H), avoiding the risk of brittleness.

3. Grade 2: Industrial pure titanium, Tensile strength ≥ 415 MPa, yield strength ≥ 275 MPa, elongation ≥ 20%, and excellent corrosion resistance. Suitable for corrosion-resistant applications with low strength requirements, and at a lower cost than Gr5.

4. Ti-6.5Al-3.5Mo-1.5Zr-0.3Si: High-strength α+β type titanium alloy, Tensile strength ≥ 1000 MPa, yield strength ≥ 900 MPa, high-temperature resistance ≤ 500°C, Suitable for high-temperature and heavy-duty applications, with fastening temperatures reaching 300-450℃.

1.Aerospace Field
Application Components: Aircraft wing skins, engine nacelle connectors, satellite frame structures, rocket fuel tank fasteners.
Material Selection: Gr5/Ti-6.5Al-3.5Mo-1.5Zr-0.3Si, titanium alloy, specifications M3-M12.
Core Requirements: Lightweight, high specific strength, resistance to vibration loosening, countersunk design to reduce airflow resistance and prevent turbulent noise during flight.

2. Medical Devices Field
Application Components: Artificial joint prosthesis fixation screws, orthopedic internal fixation plates and screws, surgical instrument assembly screws, MRI equipment housing fasteners.
Material Selection: TI6AL4VELI medical-grade titanium alloy, specifications M2-M8.
Core Requirements: Biocompatibility, non-magnetic properties, resistance to body fluid corrosion, and countersunk head design to prevent protrusion and scratching of soft tissue after surgery.

3. Marine Engineering Field
Application Components: Deep-sea probe frames, high-pressure pumps for seawater desalination equipment, structural components for offshore wind power platforms, and fasteners for ship propeller blades.
Material Selection: Gr5/Gr2 titanium alloy, sizes M5-M20.
Core Requirements: Resistance to seawater corrosion and marine atmospheric aging, and countersunk design to prevent marine organism fouling.

4. Precision Instruments and Electronics Field
Application Components: Gyroscope core components, optical instrument lens fixation, semiconductor manufacturing equipment fixtures, lithium battery module fastening.
Material Selection: Gr5 precision titanium alloy, specifications M1.6-M5.
Core Requirements: High precision, non-magnetic interference, lightweight, and Torx drive to prevent slippage and damage to precision components during tightening.

5. Chemical Equipment Field
Application Components: Reactor cover plates for strong acids and bases, nuclear chemical waste treatment equipment, fasteners for chlor-alkali electrolytic cells.
Material Selection: Gr2/Gr5 titanium alloy, specifications M6-M16.
Core Requirements: High corrosion resistance, no ion leaching, countersunk design for easy cleaning of equipment surfaces and prevention of media residue.

Titanium alloy countersunk head torx bolt

 

 

 

 

 

 

 

Baoji Reliab Metal Material Co.,Ltd is a professional manufacturer and supplier of Titanium mill products and Nickel,Zirconium products. With high quality controlling system, our products meeting the international standard as ASTM, ASME, AMS, JIS, DIN, TOCT, our main products including bars/rods, plates/sheets, tubes, wires, forgings rings, anodes, fasteners and CNC machined parts.

For over 12 years, Baoji Reliab Metal Material has grown as one of the steady suppliers for aerospace-grade titanium and medical-grade titanium products field in China.

E-mail: garychen3215@hotmail.com

Address: No.35, Baoti Rd, Baoji city, Shaanxi Province, China

Contact: Mr. Gary Chen

Phone: +86-917-8883215

Mobile/WhatsApp: +86 13092900605

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