GR5 Titanium Alloy Standard Bolts
- Grade: Gr5 (Ti-6Al-4V)
- Type: Standard Metric Bolts & Nuts
- Stock: Ready to Ship
Factory Inventory & Custom OEM
High-Performance Titanium Fastening Solutions
Explore standard stock and custom-machined titanium hardware engineered from vacuum-melted Grade 2 and Grade 5 titanium bars, meeting strict marine and industrial mechanical thresholds.
Titanium Alloy Hexagon Stem Screws
- Sizes: M5 / M6 / M8
- Finish: Industrial Bright Finish
- Sector: Cycling & Precision Mechanics
Class 8.8 Gr5 Titanium Flange Bolt
- Process: CNC Machined / PVD Anodized
- Thread: Metric / UNF Options
- Application: Motorcycle & Motorsport Custom
Titanium Wheel Lug Bolts M14 & M12
- Specs: M14x1.5 / M12x1.25
- Tensile: ≥ 895 MPa
- Use: Automobile & Circuit Racing
OEM Standard Titanium Hex Nuts
- Range: M3 to M20 Complete Sizes
- Surface: Plain Cleaned / Polished
- Standard: ISO 4032 / DIN 934
Titanium Flange Hex Nut (DIN 6923)
- Range: M4, M5, M6, M8, M10
- Property: Wear & Chloride Resistant
- Grade: Class 8.8 Equiv. Ti-6Al-4V
Anodized Gr5 Torx Head Screws
- Drive: Torx / Star Drive Flush Fit
- Color: Burnt Blue, Gold, Purple
- Application: Chassis & Fairing Shell
Titanium M8 Rotor Disc Countersunk/Button
- Size: M8 x 20mm / 25mm
- Feature: Anti-Shear Burnt Blue
- Safety: Critical Brake Fastener
Engineering Whitepaper
Countersunk Geometry & Stress Analysis in Marine Environments
Flush-mounted fasteners, particularly countersunk (flat-head) socket bolts adhering to DIN 7991 and ISO 10642 standards, introduce specific micro-mechanical trade-offs when transitioning from stainless steel (A4-70/A4-80) to aerospace-grade titanium alloy (Grade 5 Ti-6Al-4V). In coastal maritime districts such as the Marseille industrial basin, fastener failure is predominantly triggered by crevice corrosion, hydrogen-assisted stress cracking, and shear deflection under hydrodynamic drag.
Our OEM titanium countersunk bolts are precision-turned from centerless-ground ASTM B348 Grade 5 bars rather than cold-punched. This eliminates localized micro-fissures at the 90° transition between the conical countersunk angle and the threaded shank, guaranteeing fatigue endurance under cyclical sea swell vibration.
Contact Us| Mechanical Criterion | Ti-6Al-4V (Grade 5) | 316L Stainless (Marine) | Structural Benefit |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 895 - 950 MPa | 500 - 700 MPa | +35% to +45% yield load capability |
| Density (g/cm³) | 4.43 g/cm³ | 7.98 g/cm³ | 44.5% direct weight reduction |
| Pitting Resistance (PREN) | Immune to Cl- attack | 23 - 25 (Pitting prone) | Eliminates sub-surface crevice pitting |
| Thermal Expansion (α) | 8.6 × 10⁻⁶ / K | 16.0 × 10⁻⁶ / K | Stable clamp force across temperature deltas |
| Bio-fouling Resistance | Superior passivated TiO² | Moderate | Extended maintenance life cycles |
2013
Established in Baoji Valley
100+
CNC Turning & Milling Units
±0.01mm
Countersunk Angle Precision
5.0 / 5.0
Global Industrial Audit Score
Localized Application Scenarios
Engineering Application Across the Marseille Maritime & Industrial Basin
From the Port de Marseille-Fos offshore terminals to the superyacht retrofitting facilities in La Ciotat, high-tolerance titanium countersunk screws serve critical engineering junctions.
Naval Architecture & Superyacht
Hydrofoil & Keel Flush Assembly
High-speed luxury regatta catamarans and Mediterranean cruising superyachts demand flush fairing surfaces to maintain laminar flow and avoid turbulent boundary layer separation. Custom OEM Grade 5 titanium countersunk bolts are deployed on submerged rudder brackets, hydrofoil daggerboards, and anchor pocket escutcheons, completely nullifying seawater oxidation while withstanding acute dynamic hydrodynamic drag forces.
Offshore Wind & Hydrogen Terminals
Fos-sur-Mer Subsea Instrumentation
The Grand Port Maritime de Marseille (GPMM) hosts expanding offshore energy, subsea cable landing stations, and green hydrogen transmission infrastructure. Instrumentation enclosures exposed to continuous brine mist and submerged cathodic zones utilize DIN 7991 titanium countersunk fasteners to eliminate galvanic runaway and resist high hydrostatic pressure without electrolytic thread galling.
Aviation & Advanced Mobility
Marignane Aerospace Structural Assemblies
Bordering the Marseille-Provence industrial zone, rotary-wing aerospace manufacturing and tactical defense contractors rely on metric Ti-6Al-4V Torx countersunk fasteners. These provide the high shear modulus and tensile endurance required for composite skin fastening, rotor cowling joinery, and structural interior decking where zero surface protrusion is strictly mandated.
Procurement & Strategic Forecasting
Macro Trends Shaping Southern France Fastener Procurement
A granular look at the macroeconomic factors driving marine engineers and procurement officers in the Marseille region toward direct manufacturer supply chains in Baoji.
Life-Cycle Costing Over Initial Price
Marine engineers at the Marseille Shipyard Hub increasingly prioritize Life-Cycle Cost Analysis (LCCA). While 316L fasteners entail lower upfront investment, recurring replacement due to chloride-induced stress corrosion cracking during refit cycles vastly exceeds the initial cost of Grade 5 titanium, which yields an indefinite operational lifespan without surface degradation.
Lightweighting for Maritime Decarbonization
Under tightening EU IMO Tier III emission regulations, naval architects across Provence must strip top-deck weight to optimize propulsion efficiency. Transitioning thousands of deck hardware fasteners, hatch hinges, and davit assemblies to titanium saves hundreds of kilograms above the waterline, improving the vessel's vertical center of gravity (VCG) and fuel economy.
Direct-from-Source OEM Supply Security
European distributors are bypassing fragmented intermediary networks. Establishing direct technical links with vertically integrated Baoji manufacturers delivers heat-number mill certifications, EN 10204 3.1 chemical verification, and custom dimension agility impossible with off-the-shelf standard distributors.
Manufacturing Capabilities
Enterprise Strengths: Direct From China's Titanium Valley
Headquartered in the High-Tech Development Zone of Baoji since 2013, Yevzo Titanium Metal Co., Ltd. controls the manufacturing continuum from virgin titanium sponge to certified precision fasteners.
True Source Factory
Located at the origin of China's non-ferrous metal supply line, eliminating intermediate broker margins and securing raw ASTM B348 certified Grade 1, 2, 5, and 12 bar stocks with complete chemical traceability.
100+ Precision CNC Units
Equipped with modern 3-axis, 4-axis, and sliding-head Swiss CNC turning lathes designed to maintain dimensional tolerances within ±0.01mm on head angle, countersink bevel, and thread root radii.
Comprehensive Quality Testing
Every production batch undergoes optical projector thread profiling, ultrasonic flaw detection, Rockwell/Vickers hardness testing, and spectrographic composition verification before export dispatch.
Frictionless Global Logistics
Seamless fulfillment through DDP, CIF, FOB, and air express terms into Marseille-Fos, Marignane Airport, and regional hubs, accepting EUR, USD, and all standard documentary letter-of-credit instruments.
Procurement Intelligence
Frequently Asked Questions by Marseille Procurement Teams
Clear, direct answers regarding installation, metallurgical standards, anti-galling, and international delivery to Southern France.
How do Grade 5 titanium countersunk bolts mitigate galvanic corrosion when paired with marine aluminum hulls in Marseille?
Because titanium holds a significantly more noble electrochemical potential than 5083 or 6082 marine-grade aluminum, direct electrical contact in electrolytic seawater will accelerate aluminum anode degradation. To mitigate this in local shipyards, we recommend assembling titanium countersunk bolts with non-conductive dielectric isolation washers (such as reinforced PEEK or PTFE) or applying our proprietary anti-corrosion barrier coatings. When installed flush on composite carbon fiber or titanium deck fittings, galvanic risk is completely eradicated.
What design considerations apply to DIN 7991 countersunk heads in structural load joints?
Per DIN 7991 and ISO 10642, countersunk bolts feature a head geometry designed primarily for flush aesthetic and aerodynamic/hydrodynamic integration rather than maximum tensile clamp capacity. Because the internal hex or Torx drive sits deep inside the conical head, the shear plane cross-section at the head-to-shank junction is reduced compared to a DIN 912 socket cap screw. When engineering dynamic structural mounts in naval or aerospace applications, clamp load calculations should accommodate a reduction factor of approximately 20% compared to standard cylinder-head screws.
How can engineers prevent thread galling during high-torque assembly?
Titanium has a high friction coefficient and natural passive oxide layer that can cold-weld (gall) under rapid assembly or improper torque. We advise applying a dedicated marine-grade anti-seize paste containing molybdenum disulfide (MoS²) or nickel-based lubrication prior to driving. Furthermore, pneumatic impact wrenches should never be used; fasteners should be seated manually with calibrated torque wrenches to specified Newton-meter ratings.
What documentation is delivered with European OEM shipments to Bouches-du-Rhône?
Every export consignment from Yevzo includes comprehensive EN 10204 3.1 inspection certificates, detailing the precise chemical composition (aluminum, vanadium, iron, carbon, oxygen, nitrogen, hydrogen) and physical tensile/yield/elongation data of the melt heat number. Dimensional reports verifying thread pitch diameter, countersink cone degree (±0.5°), and RoHS/REACH compliance documentation are provided with every order.
What are the standard production lead times and DDP delivery terms to Marseille?
Standard inventory metric bolts ship within 48 to 72 hours. Custom OEM countersunk bolts manufactured to CAD drawings (STEP, DWG, PDF) require typically 15 to 25 business days for tooling, CNC machining, thread rolling, and surface treatment. Deliveries to the Marseille metropolitan area, including Fos-sur-Mer and La Ciotat, can be handled under Delivered Duty Paid (DDP) by express air freight (5–7 days transit) or maritime container freight into Port de Marseille-Fos (28–35 days).
Connect With Our Senior Fastener Engineers Today
Whether you require standard DIN 7991 titanium countersunk screws or custom CAD-machined Grade 5 components for marine, automotive, or industrial machinery, our factory engineering team provides immediate technical reviews, torque calculations, and volume pricing.