TITANIUM GRADE 5 (TI-6AL-4V) FASTENERS — DATASHEET, CHEMICAL COMPOSITION, MECHANICAL PROPERTIES & SUPPLY

Ananka Fasteners is a premier manufacturer and global exporter of Titanium Grade 5 Fasteners (Ti-6Al-4V / UNS R56400), the absolute benchmark of the global titanium industry. Engineered as an alpha-beta (α-β) titanium alloy, this material delivers an exceptional synthesis of high specific strength (strength-to-weight ratio), remarkable corrosion resistance, and robust mechanical performance across a broad spectrum of thermal environments.

The defining characteristic of Grade 5 titanium lies in its bimodal crystal structure. The addition of 6% aluminum stabilizes the hexagonal close-packed (HCP) alpha phase for foundational strength and stiffness, while 4% vanadium stabilizes the body-centered cubic (BCC) beta phase to retain ductility. Unlike commercially pure titanium, this dual-phase nature allows Ti-6Al-4V to be fully heat-treatable, dramatically elevating its ultimate tensile strength beyond 1100 MPa.

Every Titanium Grade 5 fastener manufactured by Ananka is produced under strict metallurgical control to prevent alpha case contamination. We utilize precision CNC machining, controlled hot forging, and mandatory thread-rolling to induce compressive residual stresses for maximized fatigue life. Backed by EN 10204 Type 3.1 Material Test Certificates, our fasteners are specified for aerospace airframes, biomedical implants, marine systems, and high-end motorsport applications where minimizing mass without compromising shear and tensile integrity is non-negotiable.

Every lot of Titanium Grade 5 fasteners shipped by Ananka is accompanied by a highly detailed EN 10204 Type 3.1 Manufacturer Test Certificate (MTC), ensuring absolute metallurgical pedigree traceable back to the originating mill.

Each MTC documents:

• Actual chemical analysis confirming strict control of Aluminum, Vanadium, Oxygen, and Hydrogen
• Complete mechanical tests for yield, ultimate tensile strength, and elongation
• Dimensional inspection data per applicable DIN/ISO/ASME/AMS standards
• Certification of alpha case eradication post-forging

The stringent chemical composition dictates the exact metallurgical limits of both primary alloying elements and trace interstitials. Oxygen functions as a powerful hardening agent, but must be strictly managed to prevent brittle "alpha case" formation during high-temperature forging.

Titanium Grade 5 provides an optimal blend of tensile capacity, moderate elasticity, and impressive fatigue endurance. Its modulus of elasticity is roughly half that of steel, allowing the bolt to act mechanically like a stiff, high-tension spring—continuously absorbing shock and resisting vibrational loosening.

Dynamic Loading & Fatigue Life (S-N Curve)

Titanium fasteners demonstrate a highly favorable Wöhler (S-N) curve compared to equivalent high-strength steel. However, titanium is inherently notch-sensitive. To prevent micro-crack propagation, threads must be rolled, not cut. Thread rolling induces massive residual compressive stresses deep at the thread root, elevating the fatigue limit by up to 70% compared to machined threads.

Upon exposure to oxygen, Ti-6Al-4V instantaneously develops a tightly adherent, self-healing titanium dioxide (TiO₂) passive film. This renders the fastener effectively immune to seawater and massive salt spray.

• Carbon Fiber Reinforced Polymers (CFRP): Titanium is flawlessly galvanically compatible with carbon fiber. Unlike aluminum or plated steel, titanium prevents joint delamination.
• Aluminum Structures: Titanium is highly cathodic. If driven directly into aluminum, the aluminum will suffer pitting. Fasteners must be installed "wet" using dielectric sealants.
• Aerospace Thread Profiles (UNJ/UNJF): J-series threads feature an enlarged continuous root radius that eliminates sharp angular cuts, drastically improving high-cycle fatigue strength.

• Titanium Grade 5 Bolts: Hex head, socket head, 12-point, and UNJ aerospace configurations.
• Titanium Grade 5 Nuts: Standard hex and heavy hex nuts matching Grade 5 proof loads.
• Titanium Grade 5 Washers: Precision stamped flat and spring washers.
• Titanium Grade 5 Studs: Machined studs for high-performance applications.

Titanium is extremely susceptible to "thread galling". Lubrication is strictly mandatory (e.g., silver/nickel anti-seize, PTFE, or PVD coatings).

• Alpha Case Eradication: All hot-forged parts are aggressively chemically milled or precision ground to completely eradicate the brittle surface layer.
• Rolled & UNJ Threads: We roll-form threads to preserve grain flow and induces compressive stresses, elevating fatigue life significantly.
• 100% Traceability: All fasteners are permanently stamped with manufacturer symbols and fully comply with AMS 4928 and ASTM B348.
• Advanced Surface Engineering: We offer Type II/IV Anodizing, PVD ceramic coatings, and specialized dry film boundary lubricants.