Product Summary:

**NOTE A new addition! The same under flush bolt design as our original under flush, but with a smaller head diameter to increase compatibility across more frames. This design has a 5.0mm diameter head compared to our other available style with a 5.5mm diameter head. 2 sizes offered to install as close as possible neatly finishing off those unused bidon bolt mounts in better than factory style.

Prototipo Works M5 316 Stainless Steel 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.

You have spoken! Originally a trial finish, now a staple in our range. Thanks to everyone who kindly purchased a set during our trial / introductory period.

Features:

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

• Taper Tech thread base for easy hole finding installation.

• Precision CNC machined from 316 Stainless Steel.

• Precision laser etched Prototipo Works logo.

• Sold as a pair (x2).

Finish:

• Natural CNC machined finish with Stealth Black Oxide coating.

• Used in motorsport and military applications to reduce glare.

• Our strong 316 Stainless Steel cannot be coloured through anodising. The Stealth Black Oxide coating’s primary purpose is not to provide additional abrasion resistance like our PVD or Cerakote coated parts but provide a unique black finish perfectly fitting to any considered bicycle build.

• Our Stealth Black Oxide coating, uniformly coats our 316 Stainless Steel parts all over creating a light protective and dull cosmetic black appearance.

• The Stealth Black Oxide coating may dull and grey over time pending the riding environment and cleaning conditions its subjected to.

  Assembly / Installation:

• Prototipo Works strongly recommends the use of a lithium based 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 5.1mm or greater (our under flush bolt is 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 5.6mm opening hole diameter or greater (our alternate under flush bolt is 5.5mm 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: PW22SS1V04H3CSB.