DISCONTINUED. A new improved versions available in x2 helpful sizes are available here by clicking the underlined links below:

Prototipo Works Under Flush Bidon Cage Boss Blank 5.0mm - Stealth Black

Prototipo Works Under Flush Bidon Cage Boss Blank 5.5mm - Stealth Black

This original version is now discontinued. It has been superseded by a new design, an evolution of the original made from 316 stainless steel. Our new improved designs incorporate many of our new ideas, new technologies and new processes coupled with your suggestions and appreciated inputs.

Product Summary:

Prototipo Works M5 6061 Aluminium Alloy Underflush Bidon Cage Boss Blank.

3mm M5 Metric thread. Excellent finishing touch to all builds.

Used to neatly and professionally blank bidon cage bosses when not in use.

Designed to visually disappear under flush in most bidon bosses.

Designed and engineered in Melbourne, Australia.

Features:

• Narrow head allows it to disappear in most bidon mounts**.

• Taper Tech thread base for easy hole finding installation.

• Precision CNC machined from 6061 Aluminium Alloy.

• Precision laser etched Prototipo Works logo.

• Hard wearing anodised black finish.

• Sold as a pair (x2).

Finish:

• Natural CNC machined finish sand blasted matte.

• Hard anodised black.

  Assembly / Installation:

• Prototipo Works strongly recommends the use of an anti seize assembly lubricant during the installation of our hardware. An anti seize assembly lubricant helps prevent seizing, galling, cold-welding, and the fusing of metal on metal threaded components. Ideal for salty environments, humid environments, in the presence of water, moisture, sweat and ingress.

• Please ensure all mating threads and installation tools are the correct size, are clean, free of damaging burrs and inserted straight.

• Bidon cage boss hole opening diameter must be at least 5.6mm or greater (our under flush bolt is 5.5mm in diameter) with at least a 3mm unthreaded depth before the thread begins into the frame.

• Where appropriate, we also offer a suitable version for a 5.1mm opening hole diameter or greater (our alternate under flush bolt is 5.0mm in diameter).

• If unsure if it will fit correctly on your bicycle, please contact us.

  Disclaimer:

• Warning! Choking Hazard, Small Parts.

• These special unique underflush bolts are for blanking purposes only! Not designed to take loads.

• Product appearance may vary slightly.

• Use at your own risk!

  Special Notes:

• Will visually disappear under flush on a majority of mass produced major OEM produced bicycles.

• May not visually disappear under flush or install correctly on bespoke, low volume custom bicycles.

• Product Code: PW22A1V03H3CB.