Top 10 Custom Titanium Fasteners Manufacturers & Suppliers

Grade 2 is commercially pure (CP) alpha-phase titanium offering outstanding cold formability and exceptional resistance against chemical corrosion, seawater, and oxidizers, but its yield strength is modest (~275 MPa) with tensile strength around 345 MPa. It is restricted to non-structural or light chemical mounting hardware.

Grade 5 (Ti-6Al-4V, UNS R56400) is an alpha-beta duplex alloy containing 6% aluminum and 4% vanadium. Heat-treated and aged Gr5 reaches a minimum tensile strength of 895 MPa and yield strength of 828 MPa, making it structurally equivalent to Grade 8.8 or Grade 10.9 high-tensile steel while weighing 44% less. Grade 5 is mandatory for automotive wheel hubs, motorcycle calipers, exhaust systems, and structural airframe joints.

Galling occurs because titanium reacts with air to build an ultra-thin oxide layer. Under heavy contact pressure and friction during torque application, this film breaks down, causing direct bare-metal contact and micro-welding between male and female threads. To mitigate galling:

• Always apply an anti-seize paste based on copper, molybdenum disulfide (MoS₂), or fluoropolymers before tightening.
• Specify rolled threads instead of cut threads, as rolled root radii provide a smoother micro-inch surface finish (Ra ≤ 0.4 μm).
• Employ surface treatments such as physical vapor deposition (TiN or DLC) or hard micro-arc oxidation to elevate surface hardness above 60 HRC.
• Mate titanium male threads into bronze, brass, or stainless steel inserts when repeated field service is anticipated.

Yes. Titanium sits on the noble (cathodic) end of the galvanic series (-0.05V vs SCE), while aluminum alloys (such as 6061-T6, -0.79V) and magnesium (-1.60V) are highly active anodes. If an electrolyte (e.g., road salt spray or brackish water) connects both metals, accelerated galvanic corrosion of the aluminum host component will occur.

To prevent this, engineers should specify non-conductive dielectric washers (PTFE, PEEK, or nylon), anodize or coat the aluminum component, or apply an isolating zinc-nickel or ceramic barrier coat to the fastener clamping interface.

Machining threads via single-point CNC tooling cuts directly across the internal grain structure of the titanium bar, leaving microscopic notch tears, tool chatter marks, and tensile residual stresses at the thread root. When subjected to repetitive cyclic loading (such as engine vibrations or suspension impacts), fatigue cracks initiate at these notches.

Roll threading plastically deforms the material between hardened dies, burnishing the thread flank and root while preserving uninterrupted grain flow along the profile. This induces beneficial compressive residual stresses that increase fatigue endurance limits by 30% to 50%.

Because the elastic modulus (Young's Modulus) of Grade 5 titanium is roughly 114 GPa—almost half that of steel (206 GPa)—a titanium bolt stretches twice as much as a steel bolt under the same clamp preload. Additionally, the friction coefficient of dry titanium is higher.

As a rule of thumb, lubricated Gr5 titanium bolts should be tightened to approximately 80% to 85% of the torque specified for an ISO Grade 8.8 steel fastener of identical diameter. Over-torquing can lead to joint relaxation or severe thread stripping. Always use a calibrated torque wrench and follow manufacturer torque specifications.

Unlike aluminum anodizing (which builds a thick sacrificial oxide layer of 10 to 25 microns), titanium anodizing is an electrochemical passivation process that grows a transparent titanium oxide film measuring between 20 and 300 nanometers. The observed colors (gold, blue, purple, magenta) are optical interference wavelengths, not dyed pigments.

Because the coating thickness is sub-micron, it has zero impact on thread fit classes (such as 6g/6H tolerances) and does not require pre-machining pitch compensation. However, for extreme anti-wear requirements, functional PVD (titanium nitride) or carbon vapor coatings are recommended over standard decorative anodizing.