The Challenge: Weight Reduction Without Fatigue Compromise

A boutique custom gravel bike manufacturer approached KeyTitan with an exacting technical requirement: they needed a complete bespoke titanium fastener package—covering disc brake rotor bolts, flat-mount caliper screws, and stem faceplate fasteners—to reduce rotational and unsprung mass without sacrificing critical safety margins.

Their previous bill of materials faced severe drawbacks:

• Standard 7075 Aluminum bolts shaved weight but suffered shear fatigue and thread stripping under heavy gravel brake torque.
• Grade 10.9 Carbon Steel bolts provided strength but added excessive weight, caused galvanic corrosion against carbon/titanium frames, and marred bike aesthetics with surface oxidation over time.

The Engineering Solution: Ti-6Al-4V with Rolled Threads

KeyTitan’s engineering team performed a detailed finite element review of their 3D CAD models and specified aerospace-grade Titanium Grade 5 (Ti-6Al-4V). Grade 5 delivers a tensile strength exceeding 950 MPa, matching high-tensile steel at nearly half the density.

To resolve off-road vibration fatigue, we introduced a specialized cold thread rolling process instead of traditional machine cut threads:

• Continuous Grain Flow: Rolling deforms the titanium crystal structure along the thread profile rather than cutting across the grain, boosting dynamic fatigue resistance by over 30%.
• Anti-Galling Geometry: Optimized thread root radii and precision multi-axis Swiss CNC turning to guarantee smooth torquing without seizing.
• Custom Surface Finishing: Multi-stage ultrasonic cleaning followed by hand-polishing and custom brand anodizing to match the customer’s flagship livery.

The Result: 45% Weight Savings & Flawless Reliability

Upgrading to KeyTitan® precision titanium fasteners reduced total fastener kit weight by 45% compared to steel, stripping crucial grams from the bike’s steering and wheel assemblies. Across thousands of kilometers of gravel race testing and harsh mud conditions, the brand recorded zero bolt failures or thread deformations.

The premium metallic finish elevated the visual appeal of their frame builds, helping justify a premium price point in the ultra-competitive high-end gravel segment.