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DIN 7991 Countersunk Titanium Bolts
Our Rison Titanium bolts DIN 7991 titanium countersunk head cap screws combine German
engineering rigor with the exceptional properties of titanium. Designed to meet the
DIN 7991 / ISO 10642 standard, these bolts feature a flat, tapered head that sits flush
with surfaces—ideal for applications demanding smooth profiles, reduced drag, or
visual perfection. Machined from aerospace-grade titanium alloys, they deliver
unparalleled strength-to-weight ratios and corrosion resistance in critical
sectors like aviation, marine, and high-end manufacturing.
Key Features & Specifications
1. Material Superiority
- Titanium Grades:
- Grade 2 (CP Titanium): Optimal corrosion resistance for marine/chemical environments.
- Grade 5 (Ti-6Al-4V): High strength (≥895 MPa UTS) for structural aerospace use.
- Core Advantages:
- 45% lighter than steel equivalents.
- Immune to saltwater, acids, UV, and galvanic corrosion.
- Non-magnetic & biocompatible (ISO 5832 compliant).
2. DIN 7991 Design Attributes
| Feature | Specification |
|---|---|
| Head Style | 90° countersunk head with internal hex drive |
| Head Height | Ultra-low profile (typically ≤0.6× thread diam) |
| Thread Standards | Metric coarse/fine (M3 to M24 common) |
| Drive Type | Hex socket (Allen key) – tamper-resistant |
| Property Class | 8.8, 10.9, 12.9 (steel strength equivalent) |
| Surface Finish | Polished, anodized (color-coded), or bead-blasted |
3. Performance Advantages
- Aerodynamic Efficiency: Flush surface eliminates turbulence in air/fluid flow.
- Space Optimization: Zero protrusion for moving parts or tight assemblies.
- Vibration Resistance: Uniform load distribution prevents loosening.
- Extreme Environment Stability: Performs from -250°C to 400°C (–418°F to 752°F).
Industrial Applications
Critical Use Cases
- Aerospace:
- Aircraft skin panels, wing assemblies, and rotor blade attachments (reducing drag and weight and so on).
- Marine:
- Hull plating, deck fittings, and subsea sensors (corrosion-free in saltwater).
- Automotive:
- Race car bodywork, battery enclosures in EVs (weight savings + safety).
- Industrial Design:
- Luxury yacht interiors, architectural facades, and medical imaging tables (aesthetic finish).
- Precision Engineering:
- Robotics, optical equipment, and semiconductor tools (EMI-free operation).
Advantages vs. Steel Countersunk Bolts
| Parameter | DIN 7991 Titanium Bolt | Steel Countersunk Bolt |
|---|---|---|
| Weight | ⬇️ 45% lighter | Heavy |
| Corrosion | ⬆️ Zero maintenance in harsh env. | Requires plating (e.g., zinc) |
| Head Profile | ✅ Tighter flush tolerance (±0.1mm) | Variable seating |
| Thermal Conductivity | Low (prevents heat transfer) | High (thermal bridging risk) |
| Fatigue Life | 2–3× longer under cyclic stress | Prone to stress cracking |
Installation Best Practices
- Countersink Preparation:
- Ensure precise 90° chamfer angle (per DIN 7991) to prevent head lifting.
- Anti-Galling Measures:
- Apply titanium-compatible lubricant (e.g., Krytox®) to threads and socket.
- Torque to 75% of steel values (titanium’s lower friction coefficient).
- Anodized Versions:
- Type III hard anodizing (25–50μm) enhances wear resistance and allows electrical insulation.
Conclusion: Engineering Perfection, Inside and Out
DIN 7991 titanium countersunk bolts solve dual challenges in advanced manufacturing:
- Functional Excellence: Unmatched strength, weight savings, and corrosion resistance.
- Design Integrity: Invisible fastening for aerodynamic or aesthetic-critical surfaces.
From supersonic jets slicing through the stratosphere to luxury yachts braving ocean storms, these bolts ensure reliability where failure is catastrophic. As industries prioritize efficiency and elegance, DIN 7991 titanium fasteners stand as the benchmark for integrated performance.
Why Choose GR5 titanium ?
✔ High strength-to-weight ratio (ideal for weight-sensitive designs).
✔ Excellent corrosion resistance (outperforms stainless steel).
✔ Biocompatibility (safe for medical implants).
Our brand is Rison Titanium , We have many Grade 5 (Ti-6Al-4V) titanium bolts, pls click Rison Titanium
to place the order if need any titanium bolts. Also we can custom made any titanium bolts nuts .
Rison Titanium is a very professional company ,we are specialized in the production of
Titanium more than 12 years. As well as we are the American Titanium Industry Association
Member. What’ more, our Rison titanium GR5 products Quality Inspected Before
Shipping and our company Manufacture in Strictly Accordance with ISO9001:2015& AS 9100 :2018.
In summary, more and more customers choose our Rison titanium bolts to match their KTM, Honda,
Zuma and so on. The important thing is we never let them down, we have own factory, so we can
ensure both quality and price,also we have more than 60000 titanium products in stock.Therefore,
we have many repeat customers.
