Direct from our verified Baoji manufacturing base to Makassar racing teams, custom fabrication workshops, and maritime engineering projects. All bolts are machined from certified Ti-6Al-4V bar stock with rolled threads.
Tensile Strength (Gr5 Baseline)
Ultra-Light Specific Gravity
CNC Turning Precision Limits
Mill Test Heat Traceability
Makassar sits as the commercial gateway of South Sulawesi, facing unique environmental and industrial dynamics: high maritime atmospheric salinity along the Makassar Strait combined with an aggressive underbone (Bebek/Matic) street racing and circuit culture.
Regional circuits such as the Pancasila Karaeng Mallombassang Circuit in nearby Gowa demand extreme rotational inertia reduction. In modified Yamaha MX King, Honda Sonic, and high-performance scooters (Aerox, NMAX 155), unsprung rotating mass dictates podium outcomes.
Replacing stock zinc-plated grade 8.8 steel disc rotor bolts and axle studs with Zunvo Ti-6Al-4V Torx Rotor Bolts slashes rotational inertia at the wheel hubs by 44%, offering instant brake response and snappier throttle pickup across coastal straightaways.
Operating out of the Port of Makassar (Soekarno-Hatta) and Paotere Harbour, commercial speedboats, maritime patrol ribs, and recreational offshore vessels face constant saltwater spray and high relative humidity (consistently exceeding 80%).
Standard 304 or 316 stainless bolts often undergo crevice corrosion and pitting beneath washers or inside blind threads. Gr5 titanium forms an instantaneous, regenerative titanium dioxide (TiO&sub2;) passivation film that remains entirely inert against warm chlorinated seawater, eliminating galvanic seizure in outboard motor mounts and steering brackets.
Custom motorcycle modification around Losari Beach and Makassar's city center prioritizes both peak structural safety and distinctive styling. Tropical humidity swiftly degrades cadmium and chrome plating, leaving unsightly rust streaks across crankcase covers.
Our PVD and vacuum-anodized titanium Torx and umbrella-head fairing screws offer jewel-grade color stability (burnt blue, gold, rainbow, and emerald) without paint peeling, ensuring that custom workpieces retain mechanical integrity and flawless aesthetics despite persistent coastal mist.
In hot and humid South Sulawesi operations, fastener selection directly governs fatigue life, mechanical reliability, and overall vehicle weight efficiency.
| Alloy & Fastener Grade | Density (g/cm³) | Tensile Yield (MPa) | Strength-to-Weight Index | Makassar Seawater Spray Resistance | High-Vibration Fatigue Resistance |
|---|---|---|---|---|---|
| Grade 5 Ti-6Al-4V (Zunvo Racing Spec) | 4.43 | 895 – 1050 | 237 kN·m/kg | Immune (Indefinite Life) | Superior (Rolled Threads 6g) |
| Class 10.9 Carbon / Alloy Steel | 7.85 | 900 – 940 | 119 kN·m/kg | Poor (Rapid Oxidation/Rusting) | High (Prone to Hydrogen Embrittlement) |
| Class 12.9 High-Tensile Steel | 7.85 | 1100 – 1220 | 155 kN·m/kg | Very Poor (Demands Constant Oiling) | High (Vulnerable to Stress Cracking) |
| A2-70 / 304 Stainless Steel | 7.93 | 450 – 700 | 88 kN·m/kg | Moderate (Crevice Pitting in Tropical Salt) | Low (Work Hardening & Galling Prone) |
| 7075-T6 Billet Aluminum | 2.81 | 480 – 505 | 179 kN·m/kg | Moderate (Intergranular Corrosion Risk) | Low (Not suitable for dynamic brake discs) |
Many low-cost fasteners in the Southeast Asian market rely on cut threads, which sever the continuous grain structure of the titanium bar, introducing microscopic stress risers at thread roots. Zunvo utilizes hydraulic thread rolling dies after high-precision CNC shank sizing. This work-hardens the thread flanks and preserves an uninterrupted molecular grain flow, elevating cyclical fatigue endurance by more than 30% under violent racetrack braking oscillations.
Titanium fasteners installed into aluminum crankcases or calipers can suffer galling (cold welding) if assembled dry under elevated torque. We supply our Makassar clients with full engineering torque conversion tables (accounting for reduced friction coefficients) and recommend anti-seize paste containing copper, molybdenum disulfide, or PTFE to guarantee seamless maintenance teardowns throughout demanding race seasons.
Founded in 2015 in China's titanium capital, Zunvo Titanium Products Co., Ltd. bridges raw metallurgical smelting with micro-tolerance CNC machining to deliver dependable OEM/ODM partnerships.
Every batch is manufactured strictly from certified Ti-6Al-4V Grade 5 titanium bars. We reject re-melted scrap or downgraded Grade 2 alloys. Chemical composition and physical mill test certificates (MTC) citing heat numbers are provided with export shipments.
Whether you need custom swingarm axle bolts, hollowed caliper pins, or specific thread pitches (such as fine M10×1.0 or M10×1.25), our technical team converts your 2D/3D CAD drawings into physical prototypes within 3 days.
Threads are verified with go/no-go optical gauges to ISO 6g/6H tolerances. Shank concentricity and socket depths are measured using optical comparators and CMM rigs, guaranteeing flawless fitment without head shearing or socket rounding.
With an average technical response time of ≤ 7 hours, we provide engineering quotes, DFM assessments, and order tracking promptly. Standard catalog items ship within 24 hours, while volume custom runs complete in 7–15 business days.
We routinely manage door-to-door express delivery (DHL, FedEx, UPS) directly to Sultan Hasanuddin International Airport and consolidated sea-freight containers via Makassar Port, handling customs documentation and protective packaging in-house.
Support your own regional performance brand across South Sulawesi. We provide laser-etched custom logos, model part codes, and retail-ready blister or clamshell packaging with custom card inserts tailored to Indonesian motorcycle speed shops.
Key technical and transactional questions from race directors, speed-shop wholesalers, and marine mechanics across South Sulawesi.
Yes. Grade 5 Ti-6Al-4V has a minimum tensile strength of 895 MPa and shear strength exceeding 550 MPa, making it structurally comparable to Class 8.8 and high-spec Class 10.9 steel fasteners while cutting un-sprung rotating mass by 44%. For high-demand rotor positions, ensure thread engagement reaches at least 1.5 times the bolt diameter and follow specified torque limits with threadlock compound.
Anodizing creates a controlled surface oxide layer whose coloration is dictated by light interference. It will never flake, peel, or blister under high tropical humidity. For high-wear applications subject to frequent pneumatic tool impact or abrasive road grit, we recommend our PVD (Physical Vapor Deposition) coatings, which provide a surface hardness surpassing 2000 HV for superior scratch resistance.
Stock fasteners leave our factory within 24 hours. For express air consignments (DHL/FedEx/UPS), transit time to Sultan Hasanuddin International Airport (UPG) typically takes 4 to 6 business days. For volume bulk wholesale orders, sea cargo routed via Port of Tanjung Priok (Jakarta) or Tanjung Perak (Surabaya) onward to Makassar Port takes approximately 18 to 25 days.
Standard catalog items (such as DIN 912 socket bolts or M8 disc brake bolts) start at 100 pieces per specification. Custom CNC components manufactured according to your CAD drawings or bespoke step-bolt dimensions start at 100 pieces per production batch, allowing racing shops and distributors to validate tolerances before committing to larger inventories.
Yes. We produce complete titanium bolt kits mapped specifically for popular domestic models such as Yamaha Aerox 155, NMAX, XMAX, MX King 150, Honda PCX, ADV, Sonic 150R, and Kawasaki Ninja 250/ZX-25R. Kits cover crankcase covers, subframe mounts, caliper brackets, front-fork pinch bolts, and fuel cap assemblies, organized and labeled by installation position.
Every commercial shipment includes a Certificate of Origin (COO), detailed packing list, commercial invoice, and an optional 3.1 Mill Test Certificate (MTC) documenting chemical spectrometry (Al%, V%, Fe%, O% content) and mechanical tensile testing from the parent bar stock.
Send your custom drawings, sample specs, or volume order lists to our engineering desk. We provide comprehensive DFM analysis, torque calculations, and competitive factory quotes within 7 hours.
