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GR5 Titanium bolts and GR2 Titanium Bolts Comparison
Titanium bolts are widely used in aerospace, automotive, medical, and high-performance engineering due to
their high strength-to-weight ratio, corrosion resistance, and biocompatibility. Among the various
titaniumgrades, Grade 5 (Ti-6Al-4V, ASTM B348) and Grade 2 (Commercially Pure Titanium, CP Ti,
ASTM B348) arethe most common. This article provides a detailed comparison between them in
terms of mechanical properties, corrosion resistance, applications, and cost.
1. Material Composition & Key Properties
What is titanium?
Titanium is is
a chemical element with the chemical symbol Ti and atomic number 22. It is a silvery-white
transition metal. It is characterized by light weight, high strength, metallic luster, and good
corrosion resistance (including seawater, aqua regia, and chlorine). Due to its stable chemical
properties, good resistance to high and low temperatures, strong acids and alkalis,
high strength, and low density, it is often used to manufacture rockets and spacecraft,
and is therefore known as the “space metal.”
You can click Wikipedia to check if you want to know more.
| Property | Grade 5 (Ti-6Al-4V) | Grade 2 (CP Ti) |
|---|---|---|
| Composition | 90% Ti, 6% Al, 4% V | 99%+ Pure Titanium |
| Tensile Strength | 900-1000 MPa (130-145 ksi) | 345-480 MPa (50-70 ksi) |
| Yield Strength | 830-900 MPa (120-130 ksi) | 275-380 MPa (40-55 ksi) |
| Elongation (%) | 10-15% | 20-30% |
| Hardness (HV) | 330-380 | 160-200 |
| Fatigue Strength | High (Excellent for dynamic loads) | Moderate (Less fatigue-resistant) |
Key Takeaways:
- Grade 5 is ~3x stronger than Grade 2, making it ideal for high-stress applications.
- Grade 2 is more ductile, allowing better formability and impact resistance.
- Grade 5 is harder, providing better wear resistance but is more difficult to machine.
2. Corrosion Resistance & Environmental Suitability
Both grades offer excellent corrosion resistance, but differences exist:
| Factor | Grade 5 (Ti-6Al-4V) | Grade 2 (CP Ti) |
|---|---|---|
| General Corrosion | Excellent (better than stainless steel) | Even better (most corrosion-resistant pure Ti grade) |
| Crevice Corrosion | Slightly susceptible in chloride-rich environments (e.g., seawater) | Highly resistant |
| Galvanic Corrosion | Can occur when coupled with aluminum/magnesium (requires anti-seize) | Less prone |
| Biocompatibility | Good (used in medical implants) | Best (most biocompatible, used in surgical tools) |
Key Takeaways:
- Grade 2 is superior in harsh chemical/sea environments (e.g., marine applications).
- Grade 5 is better for structural applications where strength is prioritized over extreme
- corrosion resistance.
3. Applications & Use Cases
Grade 5 (Ti-6Al-4V) Bolts – Where Strength Matters
✅ Aerospace (aircraft frames, jet engines)
✅ High-performance motorsports (F1, MotoGP)
✅ Medical implants (bone screws, dental posts)
✅ Military & defense (armor plating, submarine components)
✅ High-stress bicycle/automotive parts (cranksets, suspension bolts)
Grade 2 (CP Ti) Bolts – Where Corrosion Resistance & Formability Matter
✅ Marine & offshore (boat fittings, underwater fasteners)
✅ Chemical processing (reactors, piping systems)
✅ Medical devices (non-load-bearing implants, surgical instruments)
✅ Consumer goods (eyeglass frames, jewelry, camping gear)
✅ Food processing (non-reactive with acidic/alkaline substances)
4. Machinability & Cost Comparison
| Factor | Grade 5 (Ti-6Al-4V) | Grade 2 (CP Ti) |
|---|---|---|
| Machinability | Difficult (harder, abrasive) | Easier (softer, less tool wear) |
| Thread Rolling | Possible but requires high-pressure equipment | Easier to roll (better ductility) |
| Cost | $$$ (2-3x more expensive) | $ (More affordable) |
Key Takeaways:
- Grade 2 is cheaper and easier to machine, making it better for mass production.
- Grade 5 requires specialized tools (carbide cutters, high-pressure thread rolling).
5. Which One Should You Choose?
✔ Choose Grade 5 (Ti-6Al-4V) if:
- You need maximum strength-to-weight ratio.
- The bolts will face high dynamic loads (e.g., racing, aerospace).
- Wear resistance is critical (e.g., rotating parts).
✔ Choose Grade 2 (CP Ti) if:
- Corrosion resistance is the top priority (e.g., marine, chemical exposure).
- Biocompatibility is needed (medical/dental applications).
- Cost is a concern (budget-friendly alternative to stainless steel).
Final Verdict
| Metric | Winner |
|---|---|
| Strength | Grade 5 |
| Corrosion Resistance | Grade 2 |
| Machinability | Grade 2 |
| Cost Efficiency | Grade 2 |
For most engineering applications, Grade 5 is preferred for structural integrity, while Grade 2 excels in
corrosive environments and medical uses. Choose based on your specific needs!
Our Rison Titanium GR5 titanium caliper bolts , flanged bolts and double drive drill bolts are loved
by many professional athletes.
Please check our official website if you need any titanium products.
Our Rison Titanium GR2 bolts are mianly used for
RC Cars (body panels, servo mounts)
Drones & UAVs (frame assembly, camera mounts)
Miniature Racing Boats (saltwater-resistant hardware)
High-Speed Model Aircraft
Please click https://ti-alloys.com/ti-shop/?filtering=1&filter_product_brand=290 to place the order
if you need our Rison Titanium GR2 small screws.
What’s more, if you need to know more about Titanium bolts nuts , pls feel free to click Here.
Rison Titanium is a very professional company ,we are specialized in the production of Titanium more than
13 years. As well as we are the American Titanium Industry Association Member. Our taitanium bar Quality
Inspected Before Shipping and our company Manufacture in Strictly Accordance with
ISO9001:2015& AS 9100 :2018.
If you have any questions or suggestions, pls free to contact us.
