ASTM B348 Stock
GR5 Titanium Bolts M6*70mm Button Head Inner Hex Bolts
- Grade
- Ti-6Al-4V (GR5)
- Tensile
- ≥ 895 MPa
- Size
- M6 × 70 mm
- Head Type
- Half-Round Button
2011EST
Baoji Hub Foundation
≥895MPa
GR5 Tensile Strength
34%
Buyer Reorder Rate
≤1HR
Rapid RFQ Response
Direct Factory Precision Components
Featured Precision Titanium Fasteners & Bar Products
Manufactured directly from traceable Ti-6Al-4V Grade 5 bars using high-precision CNC multi-axis turning, cold heading, and thread rolling. Every unit preserves material grain boundaries for severe-duty motorsport, aerospace, and marine deployment.
High Torque
GR5 Titanium Bolts M14*1.0*35mm Umbrella Head Hex Socket
- Grade
- Ti-6Al-4V (GR5)
- Pitch
- 1.0 Fine Thread
- Size
- M14 × 35 mm
- Design
- Tapered Umbrella
Heavy Duty
GR5 Titanium Bolts M12*45mm Cylindrical Head Hex Socket
- Standard
- DIN 912 Equivalent
- Yield
- ≥ 828 MPa
- Size
- M12 × 45 mm
- Drive
- Allen Hex Socket
Ultra-Light
GR5 Titanium Bolts M6*60mm Semi-Round Head Allen Screws
- Grade
- Ti-6Al-4V (GR5)
- Density
- 4.43 g/cm³
- Size
- M6 × 60 mm
- Finish
- Vibro-Polished
Weight Optimized
GR5 Titanium Bolts M10*1*33mm Large Flat Hollow Bolts
- Design
- Weight-Relief Hollow
- Pitch
- 1.0 Fine Pitch
- Size
- M10 × 33 mm
- Application
- Chassis / Suspension
Anodized Color
GR5 Titanium Bolts M8*40mm Colored Cylinder Head Screws
- Grade
- Ti-6Al-4V (GR5)
- Surface
- Electrolytic Anodizing
- Size
- M8 × 40 mm
- Corrosion
- Zero Marine Rust
Flange Torx
GR5 Titanium Bolts M6*25mm Umbrella Flange Torx Bolts
- Drive
- T30 Star Torx
- Tensile
- ≥ 930 MPa Heat-Treated
- Size
- M6 × 25 mm
- Flange
- Integral Umbrella Washer
Motorcycle OEM
Gr5 Titanium Screws Titanium T30 Torx Bolts for Motorcycle
- Grade
- Ti-6Al-4V (GR5)
- Application
- Brake Disc / Triple Clamp
- Standard
- Custom OEM Drawing
- Cam-Out Risk
- Zero (Torx Profile)
Material Science & Standards
Titanium Bar Stock & Fastener Mechanical Properties
Understanding the mechanical and metallurgical trade-offs between Commercially Pure Titanium (GR2), Workhorse Aerospace Titanium (GR5 / Ti-6Al-4V), and traditional structural steel alloys is vital for procurement engineering.
| Material Specification | Alloy Code | Density (g/cm³) | Min. Tensile (MPa) | Min. Yield (MPa) | Elongation (%) | Corrosion Resistance | Primary Industrial Application |
|---|---|---|---|---|---|---|---|
| ASTM B348 / AMS 4928 Grade 5 | Ti-6Al-4V | 4.43 | 895 – 1000 | 828 | ≥ 10% | Exceptional (Chloride Stable) | Aerospace, Racing, High-Stress Billets |
| ASTM F136 Medical ELI | Ti-6Al-4V ELI | 4.43 | 860 | 795 | ≥ 10% | Bio-Inert & Osseointegrating | Orthopedic Implants, Surgical Screws |
| ASTM B348 Grade 2 CP Titanium | Pure Ti | 4.51 | 345 – 450 | 275 | ≥ 20% | Supreme Acid/Marine Passivity | Chemical Processing, MMO Anodes, Exhausts |
| Class 12.9 Alloy Steel | SCM435 / 40Cr | 7.85 | 1220 | 1100 | ≥ 8% | Extremely Vulnerable to Rust | Heavy Plant Machine Tooling (Non-Corrosive) |
| A2-70 Stainless Steel | AISI 304 | 7.93 | 700 | 450 | ≥ 40% | Moderate (Susceptible to Pitting) | Architectural Brackets, Food Machinery |
*All test results conform to calibrated universal tensile inspection according to ASTM E8/E8M protocols. Certified Mill Test Reports (EN 10204 Type 3.1) are generated per production heat.
Direct From China's Titanium Valley
Navzo Precision Titanium Co., Ltd.
Founded on January 10, 2011, and located along Yucai Road in the national High-tech Development Zone of Baoji, Shaanxi, Navzo operates directly within the epicenter of China’s non-ferrous metallurgy. Baoji supplies over 60% of China’s titanium sponge and ingot converting capacity, providing us with an unbroken domestic supply line of vacuum arc remelted (VAR) titanium bars.
By integrating primary ingot selection, centerless precision grinding, multi-station cold heading, 5-axis CNC turning, thread rolling, and in-house spectral inspection, we eliminate broker markups and guarantee total elemental traceability from raw sponge to certified exported component.
- On-Site Factory Verified
- AMS 2631 Ultrasonic NDT
- Top-4 Supplier Bolts Rank
- USA, DE, JP, KR Export Line
- 100% Go/No-Go Thread Gauge
- EN 10204 3.1 Traceability
Strategic Procurement Horizons
Future Procurement Trends in Titanium Bars & Billets
B2B titanium purchasing is rapidly evolving from simple transactional sourcing to holistic supply chain resilience, carbon accounting, micro-alloying consistency, and digital lot provenance.
Digital MTR Provenance & Interstitial Oxygen Control
International aerospace and defense prime contractors now demand direct blockchain-linked and digital mill test certificates documenting tight oxygen limits (<0.13% for Grade 23 ELI; <0.20% for Grade 5). Uncontrolled interstitial oxygen creates catastrophic lattice embrittlement. Procuring directly from Baoji mills with closed-loop vacuum arc remelting ensures continuous elemental reliability across consecutive fiscal quarters.
Precision Drawn Bars for Swiss-Type CNC Machining
Modern mass-production machine shops are moving away from manual billet facing to automated bar-feeder Swiss lathes. This transition requires cold-drawn and centerless-ground titanium bars holding strict h7 to h9 diametrical tolerances with exceptional straightness (<0.5 mm/m). Supplying ready-to-feed bars minimizes machine downtime, prevents spindle vibration, and eliminates pre-machining grinding costs.
Dual Sourcing & Geopolitical Supply Hedge
With European and North American aerospace tiers actively rebalancing titanium feedstock away from single-region dependencies, certified Chinese titanium mills represent the primary global alternative capable of meeting multi-thousand-ton annual demands. Establishing strategic supply agreements with ISO 9001:2015 and AS9100 qualified Baoji producers hedges against regional export controls and tariff volatility.
Manufacturing Technology Trends
Technological Innovations in Titanium Metallurgy & Processing
Overcoming the inherent physical challenges of titanium—such as extreme chemical reactivity at melting temperatures, severe thermal insulation during cutting, and susceptibility to thread galling—requires advanced engineering solutions.
Cold Heading vs. 5-Axis Turning Integration
While traditional titanium machining created 60-70% chip waste, modern Baoji production merges multi-die warm/cold heading with precision 5-axis CNC finishing. Heading reorients the metal grain flow continuously around fastener heads rather than cutting through lines of structural shear, resulting in a 25-30% higher fatigue limit for dynamic racing and motorcycle suspension bolts.
Advanced Anti-Galling Surface Coatings
Due to titanium's low shear modulus and natural friction coefficient, titanium-on-titanium threads easily gall under high torque. Navzo solves this through physical vapor deposition (PVD) diamond-like carbon (DLC), titanium nitride (TiN), and micro-arc oxidation (MAO). These treatments raise surface hardness past 2500 HV while maintaining the underlying lightweight ductile core of the Grade 5 alloy.
Electron Beam & Plasma Cold Hearth Melting
To eliminate high-density inclusions (HDI) caused by tungsten or molybdenum tool fragments, and low-density inclusions (LDI) from titanium sponge nitrides, leading Baoji ingot suppliers use vacuum arc double remelting (VAR) combined with electron beam cold hearth melting (EBCHM). This ensures ultra-pure bar stock for zero-defect critical rotables and aerospace components.
Engineering Knowledge Base
Titanium Bar & Fastener Procurement FAQ
Detailed technical answers addressing standard compliance, non-destructive testing, galling prevention, and export documentation for global industrial buyers.
What is the distinction between ASTM B348 Grade 5 and AMS 4928 aerospace bar?
While both specify Ti-6Al-4V chemistry, AMS 4928 is an aerospace-grade standard mandating tighter compositional limits (lower hydrogen, nitrogen, and oxygen thresholds), complete vacuum remelting history, microstructural verification (equiaxed alpha phase in a transformed beta matrix), and mandatory ultrasonic inspection per AMS 2631 Class A or AA. ASTM B348 is the commercial standard intended for general industrial, chemical, and motorsport applications.
How do you resolve thread galling when installing Grade 5 titanium bolts?
Titanium has a high friction coefficient and tends to weld when mating with aluminum, stainless steel, or other titanium threads under preload. We recommend: 1) applying an anti-seize paste containing copper, molybdenum disulfide (MoS2), or nickel; 2) specifying rolled threads rather than cut threads to provide a smoother root radius; or 3) ordering our PVD-coated or micro-arc oxidized fasteners to eliminate direct bare metal contact.
What quality documentation and mill certificates accompany export shipments?
Every shipment includes a certified EN 10204 Type 3.1 Mill Test Report detailing exact optical emission spectrometry (OES) chemical breakdowns, tensile testing (yield, elongation, ultimate tensile strength), heat treatment history, and lot numbering. On request, we provide third-party verification through Baoti Inspection Center, CMM dimensional inspection protocols, and ultrasonic immersion inspection logs.
Can you provide custom centerless ground titanium bars with h7/h8 tolerances?
Yes. We run multi-pass precision centerless grinding machines that hold outer diameter tolerances within ISO h7, h8, and h9 for diameters ranging from 2.0 mm to 80 mm. Bar lengths up to 3000 mm or 6000 mm can be supplied chamfered, deburred, and ultrasonic crack-tested, making them ready for automated CNC Swiss turning lines.
What are your standard Minimum Order Quantities (MOQs) and lead times?
For standard catalogue titanium bolts and stock diameter Grade 5 bars (e.g., dia. 6mm to 50mm), the MOQ is 100 to 200 pieces or 10 kg of bar stock, shipping within 5 to 7 working days. For custom OEM precision parts requiring tooling setup, cold heading dies, or specific PVD color runs, the typical MOQ is 500 pieces with prototype turnaround in 10 to 14 business days.
How does electrochemical anodizing compare to PVD vacuum coating?
Electrochemical anodizing grows an amorphous titanium oxide layer whose thickness (controlled via voltage) creates constructive light interference, producing gold, blue, purple, and green hues. It is cost-effective but has modest abrasion resistance. Physical Vapor Deposition (PVD) applies a ceramic-like coating (TiN, TiCN, DLC) under vacuum, offering surface hardness up to 2500–3000 HV and exceptional scratch resistance for high-wear motorcycle calipers and lug nuts.
Connect Directly with Baoji's Titanium Engineers
Accelerate your procurement pipeline with mill-direct pricing on certified Grade 5 titanium bars, custom CNC components, and high-strength fasteners. Share your engineering drawings (STEP, DWG, PDF) or required bar specifications for a formal quotation within 1 hour.