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| Property | Value |
|---|---|
| UNS Number | R50700 |
| ASTM/ASME Standard | ASTM F67 / SB381 |
| Tensile Strength | 550 MPa min |
| Yield Strength | 483 MPa min |
| Density | 4.51 g/cm³ |
| Max Service Temp | 430°C |
| Element | Composition (%) |
|---|---|
| Ti | balance |
| O | ≤0.40% |
| N | ≤0.05% |
| C | ≤0.08% |
| H | ≤0.015% |
| Fe | ≤0.50% |
Titanium Grade 4 is an unalloyed commercially pure titanium strengthened primarily through controlled oxygen and iron content rather than alloying additions. Higher interstitial oxygen levels, compared to lower grades, increase strength while maintaining excellent ductility and formability. Iron content remains tightly controlled to preserve corrosion resistance. This balanced composition gives Grade 4 the highest strength among the commercially pure titanium grades, making it ideal for fasteners requiring superior mechanical performance without the complexity of alloyed titanium systems.
Grade 4 fasteners offer outstanding corrosion resistance in chloride, marine and oxidizing environments due to a stable, self-healing titanium oxide surface layer. Their high strength-to-weight ratio, excellent fatigue performance and resistance to stress corrosion cracking make them ideal for aerospace, marine, medical and chemical processing applications. Combined with good weldability and elevated temperature stability, Grade 4 fasteners deliver reliable long-term performance in demanding structural and corrosive service conditions.
Specifications
Titanium Grade 4 Fasteners deliver a high-strength, corrosion-resistant fastener solution defined by precise dimensional specifications, mechanical properties, and essential technical data. Suitable for demanding engineering applications, they combine low weight with reliable performance, while remaining aligned with applicable material and dimensional requirements where specified.
| Property | Value |
|---|---|
| Tensile Strength | 550 MPa min |
| Yield Strength | 483 MPa min |
| Elongation | 15% min |
| Reduction of Area | 25% min |
| Hardness | ≤ 32 HRC |
| Modulus of Elasticity | 104 GPa |
| Thermal Expansion | 9.4 µm/m·°C |
| Thermal Conductivity | 17 W/m·K |
| Density | 4.51 g/cm³ |
| Melting Range | 1650–1670°C |
| Max Service Temperature | 430°C |
| Standard | Detail |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B18.31.3 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M3 – M64 / 1/8" – 2.5" |
| Length Range | 10mm – 300mm |
| Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Manufacturing Standards | ASTM F67, AMS 4901 |
| Inspection Standards | NACE MR0175, PMI Tested |
Applications
