Hollow Hex
GR5 Titanium Bolts M10*1*33mm Large Flat Head Hex Socket Hollow Bolts
- Spec:
- M10 × 1.0 × 33mm
- Design:
- Lightweight Hollow Head
- Grade:
- Ti-6Al-4V (Grade 5)
2011+
Founded in Baoji Titanium Valley
895MPa
Min Tensile Strength (GR5)
≤ 1h
Technical RFQ Response
44%
Weight Reduction vs Steel
Precision Catalogue
Precision Burnt Titanium Fasteners for Industrial & Racing Applications
Direct from our CNC machining and thermal oxidation center in Baoji to Kobe port industrial clusters. High-tensile, weight-reducing, and corrosion-resistant fasteners.
Half-Round
GR5 Titanium Bolts M6*70mm Button Head Inner Hex Lightweight Bolts
- Spec:
- M6 × 70mm
- Drive:
- Hexagon Socket Socket
- Grade:
- Ti-6Al-4V (Grade 5)
Burn Blue
GR5 Titanium Bolts M5*25mm Burn Blue Cup Head Hex Socket Bolts
- Spec:
- M5 × 25mm
- Color:
- Heat-Treated Burn Blue
- Grade:
- Ti-6Al-4V (Grade 5)
Full Thread
GR5 Titanium Bolts M8*20mm CNC Machined Hexagon Head Full Thread Bolts
- Spec:
- M8 × 20mm Full Thread
- Process:
- Precision CNC Turned
- Grade:
- Ti-6Al-4V (Grade 5)
Tapered Cone
GR5 Titanium Bolts M8 M10 M12 Tapered Head Inner Hex Socket Bolts
- Range:
- M8 / M10 / M12
- Geometry:
- Weight-Relief Cone Head
- Grade:
- Ti-6Al-4V (Grade 5)
High-Strength
GR5 Titanium Bolts M10*40mm High Strength Cylindrical Head Cap Screws
- Spec:
- M10 × 40mm DIN 912
- Tensile:
- ≥ 895 - 950 MPa
- Grade:
- Ti-6Al-4V (Grade 5)
Gold Flange
PSSTI GR5 Titanium Gold Flange Head Bolts Round Head Bolts M7*27
- Spec:
- M7 × 27mm Flange
- Surface:
- PVD Gold Nitride Layer
- Grade:
- Ti-6Al-4V (Grade 5)
Lockwire Drilled
GR5 Titanium Bolts M8*20mm Hex Flange Head Pre-Drilled Safety Bolts
- Spec:
- M8 × 20mm Flange Head
- Feature:
- Pre-Drilled for Safety Wire
- Grade:
- Ti-6Al-4V (Grade 5)
Engineering Whitepaper
Metallurgical Properties of Burnt Blue Grade 5 (Ti-6Al-4V) Fasteners
A rigorous examination of microstructural stability, thread rolling mechanics, and thermal oxide gradient development for critical engineering requirements in Hyogo Prefecture.
The Physics of "Burnt Blue" Oxidation
The distinctive burnt blue and gold iridescent finish is not a chemical dye or organic paint. It is a controlled thin-film interference oxide layer ($TiO_2$) formed either through electrochemical anodization (typically 65V to 85V) or precise atmospheric heat tinting (400°C to 550°C).
- Interference Coloration: Wavelength cancellation of light reflecting from the oxide surface versus the metal substrate.
- Thermal Stability: Unlike lacquer coatings, heat-tinted titanium retains color fidelity in engine compartments up to 380°C.
- Dielectric Passivation: Strengthens the naturally occurring rutile oxide film, reducing galvanic coupling potential.
Cold Heading & Rolled Thread Superiority
Navzo utilizes cold forming techniques combined with thread rolling after final heat treatment rather than thread cutting. Thread rolling maintains continuous grain boundary flow without breaking grain fibers.
- Fatigue Endurance: Rolled threads offer +30% higher cyclic fatigue life compared to turned/cut threads under high vibration.
- Work Hardening: Root hardness increases up to 35-38 HRC, mitigating shear hazards under sudden tensile shock loads.
- Surface Roughness: Thread flank surface finishes reach Ra ≤ 0.4 μm, minimizing thread galling and friction coefficient flutter.
Galling Mitigation & Fastener Integrity
Titanium fasteners exhibit exceptional strength-to-weight ratios but require specific tribological handling when interfacing with aluminum, stainless steel, or composite flanges.
- Anti-Seize Paste Protocols: Recommending molybdenum disulfide ($MoS_2$) or nickel-based anti-seize during assembly.
- PVD & Titanium Nitride (TiN): Hardness over 2000 HV on select product models prevents thread pickup during frequent service.
- Thermal Expansion Differential: Ti-6Al-4V ($8.6 \times 10^{-6}/K$) expands closely to carbon composites, minimizing thermal joint distortion.
| Fastener Material | Density (g/cm³) | Tensile Strength (MPa) | Yield Strength (MPa) | Chloride Marine Corrosion | Modulus of Elasticity (GPa) |
|---|---|---|---|---|---|
| Navzo GR5 Titanium (Ti-6Al-4V) | 4.43 | 895 - 1050 | 828 - 920 | Immune (Zero Pitting Rate) | 110 - 114 |
| SUS304 / A2-70 Stainless Steel | 7.93 | 700 | 450 | Subject to Crevice & Pitting | 193 |
| SUS316 / A4-80 Marine Stainless | 8.00 | 800 | 600 | Moderate Resistance | 193 |
| SCM435 / Grade 10.9 Alloy Steel | 7.85 | 1040 | 940 | Severe Rust without Coating | 206 |
| 7075-T6 Aerospace Aluminum | 2.81 | 572 | 503 | Exfoliation Risk in Salt Spray | 72 |
Strategic Industrial Fit
Localized Applications Across Kobe & Hyogo Prefecture
Kobe represents one of the world's most dense concentrations of heavy machinery, marine engineering, and advanced rail industries. Here is how Navzo titanium fasteners integrate into Kobe's specific supply chain ecosystems.
Port & Maritime
Maritime & Coastal Machinery
Kobe's port installations, submersible robotics, and shipbuilding yards face relentless salt fog and seawater splashing. Stainless 304 and 316 bolts frequently undergo crevice corrosion in unwashed flange crevices.
Navzo GR5 bolts exhibit virtually zero corrosion in marine splash zones, making them ideal for radar mounts, marine electronics, winches, and yacht racing assemblies where structural failure is catastrophic.
Hydrogen Valley
Hydrogen Energy & Cryogenics
With Kobe pioneering the "Hydrogen Energy Supply Chain (HESC)" project involving liquid hydrogen tankers and cryogenic terminals, fastener metallurgy must endure extreme temperature gradients down to -253°C.
Unlike standard carbon steels that suffer ductile-to-brittle transitions at sub-zero temperatures, Ti-6Al-4V maintains excellent fracture toughness and impact resistance under cryogenic environments without embrittlement.
Motorsport & Tuning
Hanshin Expressway & Circuit Tuning
The Kansai automotive tuning culture spanning Kobe, Osaka, and Hyogo circuits demands premium burnt blue aesthetic styling combined with legitimate track-grade tensile properties.
Our pre-drilled safety wire flange bolts, M14 racing wheel lug nuts, and M10 exhaust manifold studs withstand violent heat cycles without loosening, all while reducing unsprung rotational weight by 44%.
Market Dynamics
Procurement & Technology Trends in Kobe's Fastener Market
Key shifts observed among procurement directors, maintenance engineers, and performance fabricators across western Japan.
Electrification and Extreme Lightweighting
As commercial vehicle builders and specialty manufacturers in Hyogo pivot toward next-generation battery electric vehicles (BEVs) and automated guided vehicles (AGVs), every kilogram saved directly expands battery range.
Replacing traditional steel fasteners with Navzo GR5 titanium yields immediate 40-44% savings at structural mounting nodes without sacrificing joint preload or safety margins.
Full Mill Certificate Traceability
Japanese engineering compliance standards (JIS / ISO) have tightened drastically regarding raw material origins. Generic hardware store fasteners are systematically being replaced by certified batch-tracked lots.
Navzo provides complete Mill Test Reports (MTRs) compliant with EN 10204 3.1, confirming chemical composition (Al: 5.5-6.75%, V: 3.5-4.5%, Fe ≤ 0.40%, O ≤ 0.20%) and tensile yield validation per lot.
Custom OEM Drawings over Standard Catalogues
More Kobe machine builders require bespoke shank diameters, internal torx recesses (T25 to T50), hollow central cores for sensor wiring, and drilled safety lockwire holes.
Our Baoji factory handles high-precision low-to-medium batch runs from CAD/STEP drawings, allowing small specialized fabrication shops in Kansai to avoid massive minimum order constraints.
Enterprise Strength
Direct Supply from Baoji Titanium Valley to Kobe Marine & Heavy Industries
Navzo Precision Titanium Products Co., Ltd. was established on January 10, 2011, situated on Yucai Road in the High-tech Development Zone of Baoji, Shaanxi — the recognized epicenter responsible for over 60% of China's titanium refining capacity.
By establishing our production directly at the primary raw material source, we eliminate intermediary trading costs and maintain absolute control over the ingot-to-fastener lifecycle. From titanium sponge smelting validation to multi-axis CNC Swiss turning, warm heading, thread rolling, and final rainbow/burnt-blue oxidation, every step is audited under strict ISO management systems.
100% Traceable Ti-6Al-4V
Verified mill test chemical analysis with each shipment to Japan.
One-Hour RFQ Turnaround
Fast technical feasibility and quotation reviews for Kobe engineers.
Integrated Surface Finishing
In-house burnt blue, PVD nitride, and multi-spectrum anodization.
Rigorous Quality Control
Optical dimensional inspection and Go/No-Go thread pitch verification.
Procurement FAQ
Frequently Asked Questions by Kobe & Kansai Industrial Buyers
Essential technical and logistical answers regarding importing, testing, assembling, and maintaining burnt titanium fasteners.
Why choose Grade 5 (Ti-6Al-4V) over commercially pure Grade 2 for bolts?
Commercially pure Grade 2 titanium offers exceptional chemical corrosion resistance but only delivers a tensile strength around 345-480 MPa, which is insufficient for load-bearing joints. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy heat-treatable to tensile levels exceeding 895-1050 MPa with a yield strength of 828 MPa, matching or exceeding Class 8.8 and Class 10.9 steel fasteners while cutting joint weight by nearly half.
Will burnt blue titanium fasteners corrode when bolted to aluminum plates in marine environments?
Titanium is cathodic (noble) compared to aluminum. In high-salinity coastal environments like Kobe Port, direct contact in the presence of an electrolyte can cause galvanic corrosion of the surrounding aluminum flange rather than the bolt itself. To eliminate this risk, we recommend using insulating nylon/PTFE washers or applying an anti-corrosion barrier compound (such as zinc chromate or nickel-based paste) during installation.
How does the "burnt blue" finish withstand heat from motorcycle exhausts and engine headers?
Our burnt blue gradient is achieved through controlled thermal oxidation and electrochemical processes that form an integral titanium oxide ceramic film. Unlike painted or powder-coated screws, this oxide layer cannot peel, flake, or blister. When subjected to operational header temperatures (up to 400°C), the coloring remains structurally stable. Extreme temperatures exceeding 600°C over prolonged durations may further deepen the oxide layer toward darker purple/grey tones.
What is the standard delivery lead time from your factory to Kobe Port / Kansai Airport (KIX)?
For standard catalogue fasteners kept in regular inventory (M5-M10 socket cap and flange bolts), dispatch takes place within 2-4 business days. Air express shipments (via DHL, FedEx, or SF International) reach Kobe/Osaka within 3-5 days. Custom CNC-machined parts from client drawings generally require 15-20 production days, followed by either direct air freight or consolidated ocean container delivery directly into Kobe Port.
Can you provide Japanese Industrial Standard (JIS) thread pitches and drawings?
Yes. We routinely manufacture fasteners strictly adhering to JIS B 1051, DIN 912, DIN 6921, ISO 4762, and customized engineering drawings. Whether you require standard metric coarse pitch (such as M10 × 1.5) or fine pitch (such as M10 × 1.25 or M10 × 1.0) for automotive brake calipers and hydraulic unions, our multi-axis CNC machines and thread dies guarantee 6H/6g thread tolerances.
What documentation accompanies each production batch for incoming inspection in Japan?
Every commercial delivery includes an EN 10204 3.1 Material Test Report verifying the chemical ingot heat analysis, mechanical tensile and elongation test results, hardness test values, and batch-level dimensional inspection sheets showing thread pitch diameter, head concentricity, and optical surface evaluation.
Baoji to Kobe Direct Supply
Ready to Source Certified GR5 Burnt Titanium Fasteners?
Whether you need 200 replacement burnt blue flange bolts for custom motorsport fabrications or 20,000 custom CNC titanium hollow shafts for industrial machinery in Hyogo, Navzo provides certified metallurgy, prompt communication, and factory-direct pricing.
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