Burnt Blue PVD
Titanium Finish Bolt M6x12–35mm Screw for Bicycle Motorcycle Burnt Blue
- Thread Pitch: M6 x 1.0mm
- Alloy Grade: Gr5 (Ti-6Al-4V)
- Application: Spider & Crank Arm
Precision Catalog Selection
High-Performance Titanium Drivetrain Fasteners
Selected high-tensile Gr5 titanium fasteners directly compatible with 1x, 2x, gravel, downhill, and e-bike chainring spider assemblies across Finland and Northern Europe.
DIN 912 Standard
DIN912 Titanium Hexagon Socket Head Cap Screws CNC Machined Corrosion-Resistant
- Size Range: M0.8 – M24
- Tensile Class: Class 8.8 Equiv. (895 MPa)
- Finish: Machined Plain / CNC Micro
Flanged Head
ZFTI High Strength GR5 Titanium Flange Bolt M4-M10 CNC Precision Manufactured
- Standard: DIN 6921 Modified
- Certification: ISO 9001 Certified
- Feature: Integrated Pressure Flange
High Load Lug
Titanium Alloy Gr5 M12 M14-1.5x30 Hex Lug Bolts Plain Finish High Strength
- Thread Profile: Metric Fine Pitch
- Material: Titanium Grade 5
- Safety Factor: Sub-zero Impact Resistant
Umbrella Low-Profile
Anodized High Strength GR5 Titanium Alloy M6*15 Umbrella Head Drivetrain Bolts
- Drive Interface: Torx T30 / Anti-Camout
- Head Geometry: Low-Profile Aerodynamic Dome
- Surface: Hard Anodized Oxide Film
Countersunk Flat
Titanium Bolts with Flat Head Screws Zinc/Treated Finish Industrial Grade
- Standards: DIN 7991 / ISO 10642
- Application: Flush-mount Spiders
- Corrosion Class: C5-M Maritime Grade
Class 10.9 & 12.9
GR5 Titanium Alloy Anodized Caliper & Drivetrain Modified High Performance Bolts
- Tensile Rating: > 950 MPa Tested
- Colors: Oilslick, Gold, Electric Blue
- Fatigue Life: 10^7 Cycles Dynamic Proof
Torx T25/T30
Titanium Drivetrain & Disc Rotor Bolt M6 x 20mm CNC Torx Machined Fasteners
- Thread Length: 20mm Fully Rolled
- Torque Rating: Up to 12 Nm Safely
- Weight: 1.82g / piece (vs 3.3g Steel)
Engineering Whitepaper & Metallurgical Evaluation
Why Ti-6Al-4V Grade 5 Drivetrain Fasteners Dominate the Helsinki Market
A rigorous engineering appraisal of cyclic drivetrain shear stresses, galvanic corrosion mitigation, and cryogenic embrittlement thresholds in Nordic coastal environments.
In the demanding cycling conditions of the Helsinki Metropolitan Area (Pääkaupunkiseutu)—which encompasses the dense commuter arteries of Espoo, Vantaa, and Kauniainen—drivetrain components face severe operational wear. Bicycle chainrings, spiders, and chainring fasteners are subjected to brutal cyclic loading, maritime salt-spray from the Gulf of Finland, and heavy application of chemical de-icers (principally sodium chloride $\text{NaCl}$ and calcium chloride $\text{CaCl}_2$) throughout the five-month winter period. Under these conditions, conventional 7075-T6 aluminum chainring bolts suffer from stress-corrosion cracking (SCC) and rapid thread shear, while zinc-plated 8.8 grade steel bolts undergo galvanic rusting that seizes threads permanently into carbon-fiber or 6061-T6 aluminum spider recesses.
As a premier Baoji-based titanium fastener manufacturer and exporter, Yevzo Titanium Metal Co., Ltd. supplies the Finnish cycling assembly industry, bespoke framebuilders, and Nordic distribution warehouses with specialized Grade 5 Titanium (Ti-6Al-4V, Werkstoff 3.7165 / UNS R56400) chainring bolts and crankset fixing hardware. Certified to ASTM B348 and manufactured under ISO 9001:2015 quality management systems, our fasteners provide the critical metallurgical answer to the harsh winter cycling challenges experienced across Uusimaa.
| Mechanical / Chemical Property | Ti-6Al-4V (Grade 5 Titanium) | Alloy 7075-T6 (Aluminum) | A4-80 (AISI 316 Stainless) | Carbon Steel Class 8.8 |
|---|---|---|---|---|
| Ultimate Tensile Strength ($R_m$) | 895 – 1050 MPa | 510 – 570 MPa | 800 MPa | 800 – 830 MPa |
| Yield Strength ($R_{p0.2}$) | 828 – 920 MPa | 430 – 505 MPa | 600 MPa | 640 MPa |
| Material Density ($\rho$) | 4.43 g/cm³ | 2.81 g/cm³ | 7.98 g/cm³ | 7.85 g/cm³ |
| Specific Strength ($R_m / \rho$) | 214 kN·m/kg (High) | 192 kN·m/kg | 100 kN·m/kg | 104 kN·m/kg |
| Charpy V-Notch Toughness @ -30°C | 18 – 24 J (Ductile) | 8 – 11 J (Brittle) | 60 J (Ductile) | 12 J (Ductile-to-Brittle Transition) |
| Pitting Resistance Equivalent (PREN) | Immune (Stable $\text{TiO}_2$ film) | Very Low (Severe exfoliation) | 23 – 25 | 0 (Active corrosion) |
| Sub-Zero Galvanic Potential vs 7075 Cranks | +0.05 V (Low Couple Activity) | 0.00 V (Base Material) | +0.25 V (Strong Cathodic Driver) | -0.45 V (Anodic Sacrifice) |
Thread Rolling vs. Cutting
Unlike budget fasteners produced via conventional thread lathe cutting, all Yevzo titanium chainring bolts feature 100% cold-rolled external threads. This manufacturing process forces the grain flow of the Ti-6Al-4V alloy to follow the root contour seamlessly, boosting fatigue life by over 300% under high-frequency pedaling torque spikes.
Elimination of Galling (Kylmähitsaus)
Titanium-to-aluminum and titanium-to-titanium thread interactions are susceptible to cold-welding (micro-galling) when torqued dry. Our factory supplies titanium bolts with specialized proprietary PVD (Physical Vapor Deposition) DLC, titanium nitride (TiN), or vacuum-anodized boundary oxide coatings that lower the friction coefficient to 0.12.
Cryogenic Shock Resistance
Nordic midwinter operations subject crankarms to temperatures frequently dropping beneath -20°C. Standard high-carbon steels experience a brittle transformation phase. Grade 5 titanium maintains exceptional izod and notch toughness down to -196°C, guaranteeing zero bolt-head snapping when shifting under load on frozen tracks.
Targeted Nordic Applications
Localized Deployment Scenarios in Helsinki & Southern Finland
Real-world integration across municipal winter commuting, extreme gravel bikepacking, and commercial electric cargo transport networks.
1. All-Weather Urban Commuting (Talvipyöräily)
Helsinki's dedicated cycling infrastructure—specifically the prestigious Baana network and prioritized winter cycling corridors (Läntinen ja Itäinen baana)—employs aggressive sweep-salting. The slurry created by seawater humidity and calcium chloride turns budget aluminum bolts into white oxide dust within two seasons. Yevzo's Gr5 bolts preserve thread integrity and socket shape, allowing mechanics in Kallio, Töölö, and Lauttasaari to adjust chainrings without stripped sockets or seized bolts.
2. Nordic Gravel Racing & Bikepacking Rigidity
Finland has emerged as a premier epicenter for gravel exploration, with world-class events like the Nordic Gravel Series and Dirty Sipoo charting unpaved logging routes across Uusimaa and Central Finland. Running wide 1x narrow-wide chainrings (40T–46T) on 110 BCD or 104 BCD spiders creates extreme off-axis lateral chain deflection in 12-speed setups. Our precision CNC flange chainring bolts provide the torsional stiffness required to prevent chainring flex and subsequent chain drops over corrugated Finnish washboard gravel.
3. Heavy-Duty E-Cargo & Last-Mile Delivery Fleets
In alignment with the City of Helsinki's Carbon Neutral 2030 initiatives, commercial postal delivery (Posti) and urban food logistics heavily leverage heavy-duty mid-drive electric cargo bikes (Bosch Cargo Line, Shimano EP8 Cargo). Delivering peak motor torques of 85–100 Nm directly to the crank spider causes rapid shear fatigue in standard fasteners. Yevzo's Class 10.9-equivalent Grade 5 titanium bolts reliably handle sustained shear loads of over 12.5 kN per fastener unit without plastic deformation.
Procurement Intelligence
Macro Trends & Regulatory Drivers Shaping the Finnish Fastener Supply Chain
Understanding shifting procurement dynamics within the Nordic cycling equipment sector from 2025 through 2030.
1. Transition to 1x Narrow-Wide Systems
Front double-derailleur setups have largely disappeared from modern Nordic gravel, mountain, and city commuter bicycles. With 1x setups, single-chainring bolt sets require ultra-short male/female sleeve dimensions (e.g., M8x6mm and M8x6.5mm). Precision CNC machining of female nut sleeves is vital to avoid bottoming out against thin spider tabs, ensuring rigid clamping force.
2. Torx T30 Interface Standardisation
Finnish workshops are aggressively phasing out 5mm hex (Allen) drive chainring bolts. Under freezing field repairs, 5mm internal hexes frequently round out (cam-out) when exposed to icy debris. Yevzo leads the market in deep-engagement Torx T30 socket engineering, ensuring torque transfer up to 14 Nm with zero recess deformation.
3. Circular Economy & Lifetime Durability
Finnish consumers prioritize durable, circular goods. Titanium chainrings and fasteners do not require toxic sacrificial plating (such as hexavalent chromium or toxic cadmium coatings). As an inert element, Grade 5 titanium boasts an indefinite functional lifespan and is 100% recyclable, fitting seamlessly into Scandinavian corporate ESG and Green Public Procurement policies.
Manufacturing Credibility & Traceability
Direct Export from Baoji Titanium Valley to Helsinki (Vuosaari Harbor & HEL Hub)
Eliminate intermediary trading margins by connecting directly with Yevzo's ISO 9001:2015 precision manufacturing infrastructure.
Headquartered in the Honeycomb Industrial Park, Fenghuang 3rd Road, High-Tech Development Zone, Baoji, Shaanxi, China, Yevzo Titanium Metal Co., Ltd. sits at the core of China's "Titanium Valley". This industrial cluster commands over 60% of domestic titanium sponge processing and billet production, allowing Yevzo unmatched direct mill access to vacuum-arc remelted (VAR) Grade 5 bar stock conforming to ASTM B348 and AMS 4928 standards.
- Full Heat Lot Traceability: Mill Test Certificates (MTC) according to EN 10204 3.1 supplied with each production shipment, detailing verified chemical composition and tensile elongation.
- High-Precision Metrology: Thread profile inspection on Keyence Optical Shadowgraphs and Mitutoyo thread gauges (6g/6H tolerance classes).
- Custom Architectural Fasteners: Tailor-made geometries for custom framebuilders in the Helsinki region, including stepped chainring spacers and integrated eccentric bottom-bracket pinch bolts.
- Nordic DDP Door-to-Door Delivery: Transparent freight forwarding handling all Finnish Customs (Tulli) clearance, TARIC 810890 classification, and Finnish VAT (ALV 25.5%) prepayments.
Procurement & Technical FAQ
Frequently Asked Sourcing Questions by Finnish Buyers
Clear, direct answers for cycling brand purchasing directors, custom builders, and logistics heads in Finland.
What are the standard dimensions for single (1x) vs double (2x) titanium chainring bolts?
Single (1x) chainring setups typically specify male bolt lengths of M8 x 6.5mm paired with female nut sleeves of 4.5mm to 5.0mm barrel length. Double (2x) setups require longer female nuts (6.5mm to 8.5mm) and male bolts of M8 x 8.5mm to clamp both the outer and inner chainrings onto the crank spider tabs. Yevzo manufactures both catalog standard sets and custom barrel lengths (+/- 0.2mm precision) tailored to proprietary carbon crank tab thicknesses.
How does Yevzo prevent galvanic corrosion when titanium bolts interface with aluminum crank spiders?
While Grade 5 titanium forms an ultra-stable, passive titanium dioxide ($\text{TiO}_2$) ceramic layer, pairing bare titanium directly with 6061 or 7075 aluminum in conductive winter brine ($\text{NaCl} + \text{CaCl}_2$) can establish a minor galvanic cell where the aluminum spider serves as a sacrificial anode. We resolve this by offering factory-applied Physical Vapor Deposition (PVD) dielectric thin films or recommending assembly using specialized non-reactive copper-free anti-seize paste (marine-grade calcium sulfonate or synthetic grease formulated with PTFE/ceramic micro-particles).
What are your Minimum Order Quantities (MOQ) and lead times for shipping to Helsinki?
For standard off-the-shelf titanium chainring bolts and DIN standard socket bolts, our MOQ starts at just 50 to 100 sets (5 pcs/set), making it ideal for specialized framebuilders, pro workshops, and cycling boutiques. For custom OEM/ODM CNC configurations (engraved branding, specialized Torx drive, bespoke anodizing hues), our typical production batch MOQ starts at 500 sets. Air express freight via DHL/FedEx directly to Helsinki-Vantaa Airport takes 4 to 7 business days; consolidated sea container freight to Port of Helsinki (Vuosaari) takes approximately 28 to 35 calendar days.
What import tariffs and documentation apply when importing titanium fasteners into Finland?
Titanium fasteners imported into the European Union are declared under TARIC classification code 8108 90 90 (articles of titanium) or 7318 15 (specific threaded fastener types depending on customs ruling). The standard third-country EU customs tariff is typically between 3.7% and 7.0%. Finnish value-added tax (Arvonlisävero - ALV) of 25.5% applies upon customs clearance. Yevzo provides complete commercial invoices, packing lists with net/gross weights per carton, Certificate of Origin (Form A or REX system), and EN 10204 3.1 material test certificates to ensure swift processing with Finnish Customs (Tulli).
Can Yevzo provide laser engraving and custom anodized colors to match brand aesthetics?
Yes. Our high-precision fiber laser engraving systems can etch custom cycling brand logos, torque specifications (e.g., "Max 8 Nm"), and batch tracking numbers directly onto bolt heads as small as 8mm in diameter. Furthermore, we provide clean electrochemical anodization (Gold, Burnt Blue/Oilslick, Purple, Emerald, Rose Gold) and high-durability PVD vacuum plating (Jet Black / DLC and Rainbow finish) with high batch-to-batch color repeatability.
What is the recommended tightening torque for Grade 5 titanium chainring bolts?
For standard M8x0.75 Grade 5 titanium chainring bolts installed with a thin film of anti-seize lubricant, the recommended installation torque is 8.0 to 9.5 Nm for Torx T30 interfaces, and 7.0 to 8.0 Nm for 5mm hex interfaces. Because titanium possesses a lower modulus of elasticity (114 GPa) than steel (210 GPa), it stretches slightly more under preload, creating a secure locking tension that resists vibration-induced loosening over rough Finnish cobblestone roads and gravel paths.
Do your titanium fasteners comply with EU REACH and RoHS regulations?
Yes. Yevzo's titanium fasteners are 100% compliant with EU REACH Regulation (EC No 1907/2006) and RoHS Directives. Our raw titanium contains zero hazardous lead, cadmium, mercury, or hexavalent chromium compounds. Third-party SGS / RoHS laboratory testing reports are refreshed annually and made available directly to compliance auditors upon request.
Partner with Baoji's Foremost Titanium Fastener Manufacturer
Whether you require standard M8x6.5mm gravel chainring bolt packages or custom high-torque e-cargo crank hardware engineered to your 2D/3D CAD drawings, our engineering team in Baoji provides detailed DFM analysis and quotes within 24 hours.