Gr5 Ti-6Al-4V
Precision Catalog Selection
High-Performance Titanium Crank & Fastener Range
Manufactured from Baoji aerospace-grade titanium ingot, finished with cold CNC thread rolling and certified to strict European standards.
ISO 4018 Standard
Burnt Blue Finish
Rainbow Anodized
Torx Round Head
Rotor Spec M8
Heavy Duty Flange
Precision Machined
895+
MPa Tensile Strength
44%
Weight Saving vs Steel
0.00%
Chloride Pitting Rate
ISO 9001
CE Compliant Traceability
Technical White Paper: Engineering & Metallurgical Review
Material Science of Titanium Crank Bolts in Coastal & Dynamic Environments
A rigorous examination of yield stress dynamics, cyclic torsional loading, and localized chloride passivation for Croatian OEM builders and race teams.
In mechanical power transfer systems, few components absorb cyclic shear, multi-directional bending moments, and fluctuating torque loads as severely as crank bolts and bottom bracket fasteners. For mechanical engineers and fleet technicians across the Zadar County (Zadarska županija), operating machinery and high-end mobility systems along the Dalmatian coast introduces an aggressive thermodynamic environment. The relentless concentration of saline mist carried by the local Bura and Jugo winds rapidly attacks conventional zinc-plated and carbon steel 8.8/10.9 assemblies through crevice corrosion, intergranular rust, and stress corrosion cracking (SCC).
Substituting standard steel with Yevzo CE-certified Grade 5 (Ti-6Al-4V) Titanium Crank Bolts provides both a significant weight advantage and permanent corrosion immunity. Grade 5 titanium possesses a specific strength-to-density ratio exceeding nearly all structural steel alloys: with a density of 4.43 g/cm³ (compared to 7.85 g/cm³ for structural steel) and a guaranteed minimum tensile strength of 895 MPa (exceeding Class 8.8 steel requirements), our fasteners drop rotating and unsprung weight by approximately 44%. In cyclically rotating bottom brackets, motorcycle crank assemblies, and marine drivetrain fixtures, this mass reduction directly lowers angular inertia, translating into sharper mechanical responsiveness and improved energy conservation.
Furthermore, the metallurgical integrity of our crank bolts relies on our precision cold thread rolling process. Rather than cutting through the microstructural grain flow of the annealed titanium bar—which introduces microscopic stress risers and microscopic surface tears—cold-rolled threads physically displace the titanium crystals along continuous contour lines. This method work-hardens the root and crest radii, yielding superior thread shear resistance, higher fatigue endurance limits under repetitive 300W–1200W cycling torque spikes, and reduced susceptibility to cyclic load fatigue failures.
Localized Adriatic Applications
Engineered Deployment Scenarios Across Zadar & Dalmatia
Real-world integration across naval retrofits, performance cycling, and extreme coastal motorsports.
Yacht Deck & Outboard Transom Cranks
Yachts, catamarans, and luxury charter vessels docked around Marina Dalmacija (Sukošan) and Zadar Harbor face intense saltwater vapor. Our titanium bolts secure specialized winches, hydraulic drive hand cranks, and tender engines without galvanic weeping or salt encrustation.
Dalmatian Road & Gravel Racing
From the flat coastal sprints along the Adriatic Highway (D8) to the punishing hill climbs of Mount Velebit and Paklenica National Park, elite competitive cyclists utilize our M8, M15, and self-extracting M22 titanium crank bolts to resist extreme wattage flexing while trimming vital rotating mass.
Coastal Enduro & Superbike Tuning
Zadar's motorsports enthusiasts demand fasteners that tolerate continuous engine vibration and track heat cycles. Gr5 titanium flange bolts and crankcase screws maintain absolute clamp load on stator covers, transmission crankplates, and brake disk mountings without heat-induced relaxation.
Regional Industry Dynamics
Emerging Procurement Trends in Croatia’s Maritime & Light Vehicle Sector
Why commercial buyers and workshops in Zadar are migrating from imported carbon steel to direct factory titanium supply.
Premiumization of Rental E-Bike Fleets
With eco-tourism exploding across the Zadar archipelago (Ugljan, Pašman, Dugi Otok), commercial cycle hire operators run fleets of high-torque mid-drive e-bikes. Standard steel crank bolts often gall or back out under 85Nm torque motor assistance. Workshops are standardizing on titanium Grade 5 bolts to eliminate mid-season fleet downtime.
Strict EU Lifecycle Traceability
Croatian integration into the Eurozone and Schengen border systems has tightened enforcement of EN 10204 3.1 material traceability and CE marking for safety-critical hardware. Local distributors and marine equipment builders now bypass third-party trading brokers to source directly from verified Asian factories providing certified raw heat test reports.
PVD Aesthetic Anodizing in High Demand
Custom motorcycle workshops and boutique bike assemblers in Zadar frequently seek specific finish treatments (burnt blue, gold nitride, and rainbow rainbow anodization). These finishes provide a vibrant visual distinction for custom builds while providing a thin, high-dielectric protective layer against localized surface wear.
Manufacturing Authority
Yevzo Titanium Metal Co., Ltd. – Baoji Production Backbone
Founded in 2013 in the heart of China’s "Titanium Valley" (Baoji, Shaanxi), Yevzo controls an integrated production chain stretching from verified vacuum arc remelted (VAR) titanium bar stock to finished CNC micro-fasteners.
- Over 100 Multi-Axis CNC Turning & Machining Units: Holding dimensional tolerances within ±0.01mm for crank taper fittings and bottom bracket threads.
- Direct Chemical Heat Traceability: Sourced strictly per ASTM B348 specifications. Spectral composition and destructive mechanical load test reports provided with every production lot.
- Full OEM & Custom Drawing Execution: Supporting STEP, IGES, DWG files, and sample reverse engineering with rapid 5-day prototyping for specialized nautical and automotive designs.
- Streamlined EU Logistics: Reliable freight coordination directly to the Port of Zadar (Gaženica) or via Zagreb air freight, with standard DDP, CIF, and FOB terms fully supported.
Buyer Technical Consultation
Frequently Asked Questions by Zadar & EU Importers
In-depth technical and commercial answers regarding crank bolt assembly, galling prevention, import compliance, and wholesale logistics.
Why is Grade 5 (Ti-6Al-4V) specifically mandated for crank bolts over Grade 2 commercially pure titanium? +
Grade 2 commercially pure titanium has an annealed minimum tensile strength of roughly 345 MPa and a yield strength around 275 MPa, which makes it ideal for non-structural chemical immersion or marine decorative hardware. However, a bicycle or engine crank interface experiences intense cyclic torsional shear and preload tension. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy heat-treated to achieve a minimum tensile strength of 895 MPa and yield strength of 828 MPa. Installing a Grade 2 bolt into a crank spindle would lead to rapid shank deformation or fatigue failure under aggressive acceleration forces.
How do we prevent cold welding (galling) and galvanic corrosion when installing titanium crank bolts into aluminum cranks in a coastal marine environment? +
Titanium has a natural affinity to form an oxide film that can cold-weld to other reactive metals (such as aluminum crank arms or steel spindles) when dry-torqued under high tension. Furthermore, the galvanic potential gap between titanium (+0.05V) and aluminum (-0.90V) can accelerate aluminum degradation in Zadar’s salty ambient air. To prevent this, technicians should always coat the threads and under-head flange with a premium copper-based or nickel-based anti-seize paste, or use PTFE dry-film lubricant. When available, install a Grade 5 titanium washer between the bolt flange and aluminum crank seat to absorb rotational friction.
What torque specifications should workshop mechanics in Zadar use when replacing steel crank bolts with titanium? +
Because titanium has an elastic modulus of approximately 110 GPa (roughly half that of carbon steel's 210 GPa), titanium fasteners stretch more easily under applied load. However, when properly lubricated with anti-seize compound, friction coefficients drop markedly. Generally, torque values should follow the crank manufacturer’s specified clamp load, but should not exceed 85–90% of the maximum torque rated for Class 8.8 steel bolts of equivalent diameter. For standard square-taper M8 bicycle crank bolts, 35–40 Nm with anti-seize is typical; for larger hollow-spindle self-extracting bolts (M15/M18), follow the manufacturer's 45–54 Nm rating strictly with a calibrated torque wrench.
Can you provide custom thread pitches (e.g., M12x1.0, M15x1.0) and laser branding for private labels in Croatia? +
Yes. We regularly supply European distributors and racing teams with OEM/ODM manufacturing. We produce standard ISO metric, fine threads (1.0mm, 1.25mm), and UNC/UNF series. Using our CNC turning centers and automated fiber laser marking systems, we can etch your brand logo, batch heat number, and tightening torque spec directly onto the bolt head with micrometer-level precision.
What are the minimum order quantities (MOQ) and lead times for shipments directly to Zadar or Rijeka? +
For catalog products in standard sizes (such as M6/M8 hex and socket flange bolts), our typical MOQ is only 20 to 50 pieces, allowing workshops and speed shops to stock balanced inventories. Custom CNC designs to customer drawings generally require an MOQ of 100 to 200 pieces. Standard air express shipments (DHL, FedEx, UPS) take approximately 5 to 8 business days to clear customs into Croatia. LCL or FCL ocean shipments to Gaženica Port (Zadar) or Rijeka Port typically arrive in 28 to 35 transit days.
What certification documents accompany shipments into the European Union? +
Every export shipment includes a detailed commercial packing list, certificate of origin, and an EN 10204 3.1 Inspection Certificate declaring exact chemical composition (C, Fe, N, O, H, Al, V, Ti balance) and mechanical testing results (tensile strength, yield strength, elongation percentage). Our facility operates under an ISO 9001 certified quality management regime, ensuring complete batch traceability back to the raw ingot.
Connect with our Titanium Application Engineers
Whether you require standard CE-compliant crank fasteners or bespoke CAD/STEP CNC prototypes for your Zadar operation, our Baoji engineering headquarters delivers direct factory pricing and technical support within 24 hours.