A small detail for a tidy bicycle bottle-cage installation. This Tianswer hex-socket bolt is listed in Grade 5 Ti-6Al-4V (TC4) titanium alloy and comes in two M5 × 0.8 sizes: 12 mm and 15 mm. Choose the length that suits your cage, any spacers and your frame's threaded mount.
Specifications
Material: Grade 5 Ti-6Al-4V (TC4) titanium alloy
Thread: M5 × 0.8 mm
Available lengths: 12 mm and 15 mm
Head diameter: 10 mm; head height: 5 mm
Drive: 4 mm hex socket (Allen key)
Color options: titanium, gold, rainbow, burn blue and black
Sold individually: price is for one bolt
Choosing the right length
For a bottle cage that sits directly against the frame, compare the existing bolt length with the 12 mm option. If you use a spacer or a thicker cage tab, measure the complete stack before considering 15 mm. The correct choice must engage the frame insert adequately without bottoming out or contacting anything behind it. M5 is common on bicycle bottle mounts, but verify your own frame's thread and clearance rather than assuming fit.
Installation notes
Start the bolt by hand so the threads engage smoothly. Use a correctly fitting 4 mm hex key and follow the frame or accessory manufacturer's tightening guidance; do not force the bolt into a damaged or mismatched insert. If you remove a cage for cleaning or travel, keep the mounting bolts with it so the selected length stays matched to your setup. To learn more about fastener selection, shank geometry, and thread integrity, read our Ultimate Guide to Choosing Titanium Fasteners.
FAQ
Are 12 mm and 15 mm interchangeable? Not necessarily. Spacers, cage tabs and available thread depth vary. Measure your installation before selecting a length.
