Legal & Terms
Titanium vs Stainless vs Aluminum Bolts
Three materials. Three trade-offs. Strength, weight, corrosion resistance, and cost — here's what actually matters when upgrading your car's fasteners.
At a GlanceQuick Comparison
| Factor | Titanium (Grade 5) | Stainless Steel (A2) | Aluminum (7075-T6) |
|---|---|---|---|
| Weight vs stainless | ~45% lighter | Baseline (heaviest) | ~65% lighter — but lower strength per bolt |
| Tensile strength | ~950 MPa (highest) | ~700 MPa | ~572 MPa (lower — not for high-stress use) |
| Corrosion resistance | Excellent — titanium oxide passive layer | Good — chromium oxide layer | Good in mild conditions; avoid chlorides |
| Temperature rating | ~315C continuous service | ~800C (grade dependent) | ~150-200C before strength loss |
| Surface finish | Natural metallic sheen; anodizable to multiple colors | Silver / mirror polish | Anodizable to many colors |
| Galling risk | Moderate — anti-seize required for threads | Higher — stainless on stainless can gall | Low |
| Cost tier | Premium | Budget-friendly | Moderate |
| Ideal application | Weight reduction, premium build, show car, track | Corrosion upgrade, budget replacement | Decorative / low-stress non-structural only |
| AeroBon product | AeroBon Titanium Bolt Kit | - | - |
Bottom line: Titanium delivers the best strength-to-weight ratio of the three. Stainless is the budget-friendly corrosion-resistant choice. Aluminum is lightest by volume but lowest in strength — suitable only for non-structural, low-torque applications.
In DepthHow Each Material Performs
Ti-6Al-4V — The Performance Choice
Grade 5 titanium (Ti-6Al-4V) is the aerospace and motorsport standard. 45% lighter than stainless with superior tensile strength, and corrosion resistance that outlasts both alternatives.
- ~45% lighter than stainless for identical geometry
- ~950 MPa tensile strength — highest of the three
- Exceptional corrosion resistance — survives road salt, humidity, wash cycles
- Anodizable — multiple color options for aesthetic builds
- Non-magnetic; bio-compatible (no off-gassing)
- Apply anti-seize or titanium-specific lubricant for threads on re-use
- Premium cost — a deliberate investment in performance
304 / A2-70 — The Practical Upgrade
Stainless steel is the most widely used corrosion-resistant fastener material. A2-70 (304 grade) replaces standard carbon steel OEM hardware with a clean silver finish and solid corrosion resistance.
- Corrosion-resistant — chromium oxide passive layer
- Budget-friendly — most affordable upgrade from OEM
- Wide availability; familiar torque specifications
- Good temperature range for most underbody applications
- Heaviest of the three — no weight advantage
- Higher galling risk when stainless threads contact stainless nuts — lubricate carefully
- 316 (A4) offers better corrosion resistance for marine or coastal environments
7075-T6 — Lightweight, Low-Stress Only
7075-T6 aluminum is the strongest aluminum alloy, but still significantly weaker than both titanium and stainless. Use only for decorative, non-structural, or very low torque applications.
- ~65% lighter than stainless by volume
- Anodizable to a wide range of colors
- Low galling risk
- ~572 MPa tensile — lowest of the three; do not use on structural or torque-critical points
- Susceptible to thread stripping under repeated torque cycling
- Can pit and corrode in chloride (salt) environments without anodizing
- Short-term limit ~150-200C — avoid near exhaust, brakes, or engine heat sources
Decision GuideWhich Bolt Material Is Right for Your Build?
Choose Titanium if...
- You're reducing weight on a performance or track build
- You want premium aesthetics alongside real functional benefit
- You care about long-term corrosion resistance — no re-torque from rust expansion
- You're building a show car where detail matters
- You want color-matched or anodized hardware to complete a theme
Choose Stainless if...
- Budget is the priority over weight savings
- You want a clean, rust-free upgrade from OEM black oxide bolts
- You live in a high-humidity or coastal environment where bare steel corrodes fast
- The application involves high temperature exposure (exhaust, engine bay)
Choose Aluminum if...
- The application is purely decorative and load-bearing is not a factor
- You want maximum color variety through anodizing
- Torque loads are minimal and well below the material's limits
- Important: Never use aluminum bolts on suspension, brake, or structural chassis points
Safety note on aluminum bolts: Aluminum fasteners are appropriate only for non-critical, low-torque trim and accessory applications. Suspension components, brake calipers, wheel hardware, and structural body mounts require steel or titanium grade fasteners. If in doubt, use titanium or stainless.
Technical SpecsMaterial Properties Compared
Key mechanical and physical properties for the standard grades used in automotive aftermarket fasteners.
| Property | Titanium Grade 5 | Stainless A2-70 (304) | Aluminum 7075-T6 |
|---|---|---|---|
| Common designation | Ti-6Al-4V | 304 / A2-70 | 7075-T6 |
| Density | 4.43 g/cm3 | ~8.0 g/cm3 | 2.81 g/cm3 |
| Weight vs stainless (same geometry) | ~45% lighter | Baseline | ~65% lighter |
| Tensile strength | ~950 MPa | ~700 MPa | ~572 MPa |
| Yield strength | ~880 MPa | ~450 MPa | ~503 MPa |
| Strength-to-weight ratio | Highest of the three | Mid | Lower than titanium |
| Max service temp. | ~315C | ~800C | ~150-200C |
| Corrosion resistance | Excellent | Good | Moderate |
| Magnetic | No | Generally non-magnetic; may show slight magnetism if cold-worked | No |
| Anodizable | Yes | No (polished only) | Yes |
Tensile and yield values represent typical grades used in automotive aftermarket fasteners. Actual product specifications vary by manufacturer and product line.
Common QuestionsFAQ
Are titanium bolts stronger than stainless steel bolts?
Grade 5 titanium (Ti-6Al-4V) has a higher tensile strength (~950 MPa) than standard A2-70 stainless (~700 MPa). More importantly, titanium achieves this at roughly half the weight — a significantly better strength-to-weight ratio. For applications where both weight and strength matter, titanium wins.
Will titanium bolts rust or corrode?
No. Titanium forms a stable, self-healing titanium oxide passive layer on its surface. It is highly resistant to road salt, humidity, car wash chemicals, and most acids. It outlasts stainless steel in corrosive environments and will not rust under normal automotive use.
Can I use aluminum bolts on suspension or brake components?
No. Aluminum bolts should never be used on structural, suspension, brake, or safety-critical fastener points. The lower tensile strength and susceptibility to thread stripping under cyclic load make aluminum unsuitable for high-stress applications. Use titanium or stainless for any bolt that requires a torque specification or handles dynamic load.
What grade titanium are AeroBon bolts?
AeroBon titanium bolt kits use Grade 5 titanium (Ti-6Al-4V) — the aerospace and motorsport standard grade, selected for its combination of high strength, low weight, and corrosion resistance. Check the individual product page for full grade and specification details.
Do titanium bolts require different torque specifications?
Always follow the torque specification provided by the vehicle manufacturer or the titanium bolt supplier. When anti-seize lubricant is applied (required for titanium), many suppliers recommend reducing target torque by 15-25% compared to dry-install specs. Confirm with your bolt kit's included documentation.
Are titanium bolts worth it for a daily driver?
Yes, for the right application. The corrosion resistance benefit is valuable for daily drivers in humid or salted road environments — titanium bolts on exterior trim, spoilers, and mirror caps will never seize or rust out, unlike OEM black oxide hardware. The weight saving is a secondary benefit for daily use.
Can I mix titanium and stainless hardware?
Yes, titanium and stainless steel are generally compatible with minimal galvanic corrosion risk under normal automotive conditions. Both metals sit close together on the galvanic series. In standard driving environments the risk is negligible. For prolonged marine or coastal exposure, an isolating coating or regular inspection is advisable.
What does "Grade 5" mean for titanium?
Grade 5 (Ti-6Al-4V) contains 6% aluminum and 4% vanadium, which significantly increases strength and hardness over pure titanium. It is the most widely used titanium alloy in aerospace, medical, and motorsport applications. For structural automotive fasteners, Grade 5 is the correct specification.
Are titanium bolts worth the extra cost?
For exterior aero parts — spoilers, mirror caps, splitters, diffusers — yes. These are bolts you may remove seasonally for detailing, track prep, or part swaps. OEM black oxide hardware corrodes and seizes over time. Titanium bolts don't rust, don't seize, and don't require corrosion removal before re-torquing.
Do titanium bolts seize or gall?
Titanium has a moderate galling tendency — especially when titanium threads contact other metals under torque without lubrication. The solution: always apply anti-seize lubricant (or a titanium-specific thread compound) to the bolt threads before installation. With proper lubrication, titanium bolts install cleanly and remove without issue even after extended service.
AeroBon Application GuideWhere Titanium Bolts Deliver the Biggest Benefit
Not all bolt upgrades are equal. Titanium pays off most in applications where hardware is exposed to the elements, removed periodically, or highly visible. These are the exact conditions found across AeroBon's aero parts lineup.
Upgrade to Titanium — The Build-Ready Fastener
AeroBon titanium bolt kits are Grade 5 Ti-6Al-4V — lighter, stronger, and more corrosion-resistant than the hardware they replace. Vehicle-specific kits for spoilers, mirror caps, and aero parts.