TC4 Grade 5 Screws: Comprehensive Guide to Titanium Fasteners

TC4 Grade 5 screws are high-performance titanium fasteners widely used in aerospace, medical, and industrial applications where strength, corrosion resistance, and lightweight properties are essential. TC4, also known as Ti-6Al-4V, is an alpha-beta titanium alloy containing 6% aluminum and 4% vanadium. This alloy provides excellent mechanical properties and chemical resistance, making it ideal for demanding environments.

At Flybear Fastener, we offer a full range of TC4 Grade 5 screws including socket head, countersunk head, and button head designs suitable for critical engineering applications.

Understanding TC4 Grade 5 Screws

TC4 Grade 5 screws are manufactured to international standards ensuring consistent mechanical properties. They offer high tensile strength (approximately 950 MPa), low density (4.43 g/cm³), and excellent fatigue resistance, making them superior to conventional stainless steel fasteners for high-performance assemblies.

International Material Designation

The material of TC4 Grade 5 screws is often referred to internationally as:

Ti-6Al-4V (Grade 5) – ASTM F136 / ISO 5832-3 for medical implants
UNS R56400 – Unified Numbering System for aerospace components
EN 3.7165 – European designation for titanium alloy fasteners

These international naming conventions ensure compatibility and recognition across global engineering and procurement platforms.

Types of TC4 Grade 5 Screws

TC4 Grade 5 screws are available in multiple head styles:

Socket head cap screws (DIN 912 / ISO 4762)
Countersunk head screws (ISO 2009)
Button head screws (DIN 7380)
Fully threaded studs and partially threaded bolts

Selection depends on application requirements, including torque, load distribution, and assembly accessibility.

Corrosion Resistance and Surface Treatments

TC4 screws have excellent corrosion resistance due to the formation of a titanium oxide layer. Additional surface treatments can improve wear and chemical resistance:

Electropolishing – smooth surface for medical and aerospace applications
Anodizing – enhances surface hardness and wear resistance
Passivation – improves chemical stability

Applications of TC4 Grade 5 Screws

TC4 Grade 5 screws are widely used in high-performance sectors:

Aerospace fasteners for airframes and engines
Medical instruments and implants
Marine and offshore components
Automotive high-performance parts
Robotics and precision machinery

Advantages of TC4 Grade 5 Screws

Compared to traditional stainless steel or alloy steel fasteners, TC4 screws offer:

High strength-to-weight ratio
Superior corrosion resistance
Excellent fatigue performance
Low density for weight-sensitive applications
Compatibility with medical and aerospace international standards

Common Sizes and Standards

TC4 screws are typically manufactured in standard metric sizes (M2–M12) with ISO or DIN threads. They may also follow ASTM or ASME standards depending on the application.

Selection Guide for TC4 Screws

Consider the following when selecting TC4 screws:

Thread size and pitch
Head style for assembly access
Load requirements and mechanical stress
Corrosion and temperature exposure
Surface finish and industry standards

Conclusion

TC4 Grade 5 screws, internationally recognized as Ti-6Al-4V or UNS R56400, are essential fasteners for high-performance applications. Their strength, corrosion resistance, and lightweight nature make them ideal for aerospace, medical, and industrial uses. Understanding material designations, types, and applications ensures proper selection for reliable and durable assemblies.