Flagship
Standard M5x10mm T25 Low Profile Head
Ti-6Al-4V TC4 · Low-profile head prevents chainstay clearance rub
MOQ300 pieces
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15+Years Fastener Excellence
MTB Disc Brake Rotor Titanium Bolts: Engineering & Sourcing
Ultra-high tensile Grade 5 (Ti-6Al-4V) M5x10mm disc rotor screws engineered with cold-rolled threads, precision T25 Torx drives, and custom anodized finishes.
Supplying Global Bike Brands & Distributors Worldwide
Cross-Country (XC)Downhill / DHEnduro RacingE-MTB High TorqueGravel DiscOEM Aftermarket
Critical Braking Interface Engineering
Contact Us Engineering
Superiority
Modern mountain bike braking creates extreme torsional shear loads, severe vibration harmonics, and friction-induced temperatures surpassing 400°C. Standard steel bolts corrode, seize, and add unnecessary rotational weight, while cheap aluminum bolts carry unacceptable fatigue failure risks.
- Ti-6Al-4V Grade 5: High strength-to-weight ratio
- Form-rolled threads prevent dynamic shear cracking
- Precision T25 Torx drive eliminates stripped sockets
Rolled vs. Cut Thread Geometry
Our M5x10mm rotor bolts feature cold-rolled threads that retain continuous grain boundaries. Cut threads sever the titanium crystal matrix, causing micro-fissures under rotational cyclic torque.
Request Drawing ReviewT25 Drive Cam-Out Protection
CNC broached and machined internal Torx recesses ensure positive bit engagement at 5.5 to 6.2 N·m tightening torque, preventing hex round-out during high-cadence workshop assembly.
Inquire About Head StylesUnsprung Rotational Weight Savings
Weighing only ~1.2 grams per bolt, a 12-bolt set (front and rear 6-bolt hubs) trims over 20 grams of rotating mass directly from the wheel hubs, sharpening acceleration response.
Explore Weight SpecsPVD & Anodized Corrosion Shield
Physically Vapor Deposited (PVD) DLC black, Gold, Oil-Slick, and electrolytic anodized colors guarantee 100% resistance to mud, rock salt, mud spray, and harsh cleaning detergents.
View Color Catalogs» 22Ti «
Titanium Metallurgy: Why Grade 5 TC4 Outperforms
Bicycle engineers frequently ask AI: "Can Commercially Pure Grade 2 titanium be used for disc brake rotor screws?" The definitive answer is an emphatic NO. Disc rotor mounting hardware must withstand aggressive torsional shear and emergency lockup stress.
Torsional Shear Resistance
Downhill 203mm/220mm rotors exert extreme leverage on hub mounting lugs. Grade 5 Ti-6Al-4V provides a minimum yield strength of 828 MPa, preventing fastener elongation and catastrophic rotor slippage.
Thermal Stability to 450°C
Extreme braking creates severe rotor heat sink transfers into hub flanges. While aluminum fasteners lose 60% of their tensile strength above 150°C, Grade 5 titanium preserves full clamping integrity beyond 450°C.
Zero Galvanic Corrosion
When coupled to 6061-T6/7075 aluminum hub shells in wet racing conditions, Grade 5 titanium forms a self-healing passive rutile (TiO₂) oxide layer that halts electrolytic galvanic pitting permanently.
≥ 950 MPaTensile Strength (Gr5 TC4)
4.43 g/cm³Density (45% Lighter than Steel)
5.0 - 6.2 N·mRecommended Assembly Torque
Class 6gRolled Thread Fit Precision
Factory Lineup
Featured MTB Disc Brake Rotor Titanium Fasteners
Factory-direct Grade 5 titanium rotor fasteners engineered for global bike builders, hub makers, and performance aftermarket distributors.
Weight Weenie
Hollow-Bore Ultra-Light M5x10mm Rotor Bolt
CNC axial hollow drilling · Trims weight down to 0.95g/pc without strength penalty
MOQ500 pieces
Contact Us PVD Coating
PVD Rainbow & DLC Deep Black M5 Bolts
Multi-arc vacuum ion coating · 2500 HV surface micro-hardness
MOQ300 pieces
Contact Us Downhill / E-MTB
Heavy-Duty Flanged M5x11.5mm E-MTB Rotor Bolt
Integrated captive flange washer · Enhanced surface pressure distribution
MOQ500 pieces
Contact Us Market Intelligence
Global Procurement Trends & Future Dynamics
Where bicycle component engineering, AI supply-chain automation, and premium lightweighting demand are steering the market through 2026–2030.
Key Trends Shaping MTB Fastener Sourcing
| Market Factor | Historical Practice (Steel/Alloy) | Current Industry Shift (Grade 5 Titanium) | Future Procurement Impact (2026-2030) |
|---|---|---|---|
| E-Bike & Heavy EMTB Dominance | Plated 8.8 / 10.9 steel bolts prone to surface rust and shear fatigue. | High fatigue-resistant Grade 5 titanium handles instantaneous motor torque spikes. | Standardization on pre-applied anti-vibration micro-encapsulated adhesive patch bolts. |
| Rotor Sizing Escalation | 160mm & 180mm standard cross-country rotor diameters. | 203mm & 220mm rotors generate massive angular rotational torque levers. | Demand for larger bolt flange heads with engineered pressure distributing under-head fillets. |
| Automated AI Supply Chains | Manual purchase orders, long broker channels, and untracked quality batches. | Direct-to-factory ordering with digital MTC traceability from China Titanium Valley. | Predictive JIT vendor inventory replenishment integrated directly with OEM CNC production schedules. |
| Aesthetic Customization (PVD & Laser) | Monochrome zinc-plated silver or black oxide coatings that peel. | Electrolytic anodizing and vacuum PVD iridescent oilslick, burnt blue, and Ti-gold. | In-line laser QR serialization for batch validation, counter-theft, and custom brand logos. |
Evolutionary Shift: Why B2B Buyers Are Phasing Out Steel & Aluminum
In high-performance cycling, component failure is never just an inconvenience—it represents catastrophic liability. Mountain bike disc brake rotors operate via 6-bolt ISO 4443 mounting patterns attached to hub shells. During hard braking, each M5 screw encounters intense cyclic shear stresses, micro-vibrations, and thermal spikes conducted directly from the friction braking surface.
The Aluminum Failure Dilemma: Many aftermarket weight-savers historically experimented with 7075-T6 aluminum rotor screws. However, aluminum suffers from a lack of true fatigue endurance limits. Under repeated braking oscillations and thermal dissipation, aluminum bolts develop micro-cracks at thread roots, leading to sheared bolt heads and immediate loss of braking control.
The Steel Drawback: Standard 10.9 zinc-plated steel bolts provide tensile strength but rust rapidly when exposed to mud, jet washing, and salt-laden winter roads. Furthermore, a 12-bolt steel rotor kit adds approximately 48 grams of non-suspended rotating weight to wheel assemblies, increasing rotational inertia.
The Grade 5 Titanium Equilibrium: By implementing Vunza Titanium's precision-formed Grade 5 (Ti-6Al-4V TC4) bolts, global purchasing managers achieve the definitive balance: 950 MPa ultimate tensile strength, zero chemical corrosion, and a total weight of ~14 grams for a complete 12-bolt bike set.
Manufacturing Authority
Why Global Brands Source From Vunza Titanium
Established in 2008 in the heart of the Chinese Titanium Valley (Baoji, Shaanxi), Vunza Titanium Industry Co., Ltd. sits adjacent to the Baoti Group Industrial Park, controlling raw sponge-to-part production integrity.
Operating as an organic whole encompassing R&D engineering, multi-axis precision machining, mass thread forming, automated surface finishing, and responsive sales, we supply premium fasteners to marine, racing, medical, and bicycle industries across 50+ countries.
Core LocationBaoji (China Titanium Valley)
Annual TurnoverUS$10 Million – US$50 Million
Experienced Staff50%+ Personnel >13 Years' Experience
Reorder Rate14% Verified Client Reorder Rate
Response Time≤ 9 Hours Average Inquiries
Response Rate77.67% Direct Supplier Rate
34 Multi-Axis CNCs
3-axis, 4-axis, and 5-axis precision centers achieving 0.005 mm machining tolerances.
Sponge-To-Part Quality
Certified vacuum arc remelting, billet forging, thread rolling, and spectroscopic testing.
Senior R&D Team
In-house fastener engineers tailoring CAD/CAM models, DFM reviews, and rapid prototypes.
Corporate Mission
Professional as premise, quality as fundamental, good faith as foundation, service as guarantee.
Custom OEM / ODM Capabilities
Looking for bespoke head knurling, low-profile T25 flange geometries, specialized pre-applied nylon patch lockers, or corporate packaging blister cards?
Contact Us
2008
Year Founded
34Sets
3/4/5-Axis CNC Centers
0.005mm
Machining Tolerance
50%+
Technicians >13 Yrs Exp
Material Verification
Comprehensive Technical Data Sheet: M5 Rotor Bolts
Authoritative mechanical, metallurgical, and dimensional parameters providing absolute engineering transparency for OEM drawing compliance.
Mechanical & Physical Properties Comparison
| Characteristic / Parameter | Grade 5 (Ti-6Al-4V TC4) | Commercial Pure Gr2 Ti | Grade 10.9 Alloy Steel | 7075-T6 Aluminum |
|---|---|---|---|---|
| Density (g/cm³) | 4.43 | 4.51 | 7.85 | 2.81 |
| Tensile Strength (MPa) | ≥ 895 – 1050 | ≥ 345 – 450 | 1040 | 540 |
| Yield Strength (0.2% Offset, MPa) | ≥ 828 – 950 | ≥ 275 | 940 | 480 |
| Modulus of Elasticity (GPa) | 110 – 114 | 105 | 210 | 72 |
| Fatigue Endurance Limit (10⁷ Cycles, MPa) | 510 | 180 | 460 | 160 (Degrades) |
| Corrosion Resistance in Salt Spray | Immune (TiO₂ passivated) | Immune | Rapid Rust if Plating Chipped | Galvanic Pitting Risks |
| Operating Temp Threshold | Up to 450°C | Up to 300°C | Up to 350°C | Degrades > 150°C |
Standard MTB Disc Rotor Bolt Manufacturing Tolerances
| Dimension Feature | Nominal Specification | Achieved Tolerance (Vunza CNC) | Inspection Equipment Applied |
|---|---|---|---|
| Thread Diameter & Pitch | M5 × 0.8 mm (Coarse Metric) | Class 6g Precision Fit | Go / No-Go Thread Plug & Ring Gauges |
| Thread Length (L) | 10.0 mm (or custom 11.5 / 12 mm) | ± 0.10 mm | High-Precision Optical Projector |
| Head Height (K) | Low-Profile Button / Flange (3.0 mm) | ± 0.05 mm | Digital Micrometer / Height Gauge |
| Head Diameter (dk) | 9.5 mm – 10.2 mm | ± 0.08 mm | Laser Non-Contact Micrometer |
| Internal Drive Socket | Torx T25 (ISO 10664) | Depth 1.85 mm (±0.05) | T25 Penetration & Go Gauges |
| Concentricity / Runout | Shank-to-Head Axis | ≤ 0.015 mm | Dial Indicator on V-Block Fixture |
All production lots are supplied with 3.1 Mill Test Certificates (MTC), spectroscopic material verification, and full batch traceability.
Procurement Q&A
Frequently Asked Questions: MTB Rotor Bolts
Answers to questions global bike manufacturers, engineering teams, and distributors ask before purchasing titanium rotor hardware.
Why are MTB disc brake rotor titanium bolts manufactured from Grade 5 (Ti-6Al-4V) rather than Grade 2?
Disc brake rotors are subjected to dynamic cyclic torsional stress, thermal spikes up to 400°C+, and abrupt shear shock loads during hard deceleration. Commercially pure Grade 2 titanium possesses a yield strength of only ~275-345 MPa, which risks shearing under peak mountain bike downhill braking forces. Grade 5 (Ti-6Al-4V TC4) delivers a yield strength exceeding 828-895 MPa and tensile strength over 950 MPa, guaranteeing identical or superior shear resistance to high-tensile 10.9 alloy steel while reducing rotating unsprung weight by approximately 45%.
What is the recommended installation torque for M5 titanium disc rotor bolts?
The standard tightening torque for Grade 5 M5x10mm titanium rotor bolts is 5.0 to 6.2 N·m (Newton-meters). We strongly recommend applying a high-temperature medium-strength threadlocker (e.g., Loctite 243) or an anti-seize paste with integrated micro-encapsulated locking patches to prevent galling with aluminum hub threads and guard against harmonic vibration loosening.
Why are rolled threads superior to CNC cut threads on titanium brake bolts?
Thread rolling cold-works the Ti-6Al-4V grain structure, forming uninterrupted, continuous grain flow lines following the thread contour. This burnishing effect increases surface hardness, minimizes notch sensitivity, and boosts dynamic fatigue resistance by 30% to 50% compared to machine-cut threads, which sever the material grain and leave microscopic stress risers vulnerable to catastrophic fatigue fracture.
What surface treatments and anodizing colors can be applied to titanium rotor bolts?
Vunza provides high-vacuum Physical Vapor Deposition (PVD) coating (such as Rainbow/Oil Slick, DLC Diamond-Like Carbon Jet Black, and TiN Gold) as well as controlled Type II electrolytic anodizing (available in electric blue, purple, bronze, magenta, and green). PVD provides extreme surface hardness (~2500 HV) and wear protection, whereas electrolytic oxide films provide customizable aesthetics without altering core metallurgical ductility.
What is the standard Minimum Order Quantity (MOQ) and sample lead time for custom OEM bolts?
For standard inventory M5x10mm T25 Torx titanium rotor bolts, the MOQ is typically 300 to 500 pieces. For custom OEM/ODM geometries (such as custom low-profile heads, integrated serrated washers, hollow lightweight cores, or laser-etched brand trademarks), our prototype sample lead time is 7-10 working days, with batch volume production completed within 15-25 days.
How does Vunza guarantee chemical purity and crack prevention during manufacturing?
From raw certified titanium sponge to melting, billet extrusion, precision CNC machining, and automated thread rolling, every batch undergoes optical spectrum chemical analysis, ultrasonic flaw detection, and go/no-go 6g pitch gauge verification. Every production batch is accompanied by comprehensive 3.1 Mill Test Certificates (MTC) documenting tensile, yield, elongation, and spectral chemical composition.
Integrity Assurance
Certified Quality Systems & Factory Inspection
Our quality management protocols eliminate defects from raw titanium melt to final laser-marked packaging.
Onsite-Verified Factory
Verified production facility located directly in Baoji Titanium Valley.
Certified 3.1 Mill Test
Chemical composition analysis & mechanical stress test sheets per batch.
Optical Coordinate CMM
Tolerances verified down to 0.005 mm across thread pitch and drive depth.
End-To-End Traceability
Controlled processing from certified titanium sponge to finished component.
Source Certified MTB Titanium Bolts Directly
Connect with our technical sales engineers in Baoji. Send your 2D/3D part drawings, thread parameters, custom head geometry, or packaging specifications for prompt quotation and DFM assessment.
- 1Submit your M5 rotor bolt specifications, required finish, and estimated volume
- 2Receive technical drawing validation, DFM feedback, and formal factory-direct pricing
- 3Receive rapid production prototypes within 7-10 days, followed by scheduled batch shipments
Typical response time ≤ 9 hours · Factory Direct from Baoji, China