Bicycle Spindle
Engineering question – what size Die do I need?

My bicycle spindle is 9.3mm thick across the unthreaded portion with a 1.0 thread on the threaded portion. But an M9x1.0 Die does not fit over the threaded portion. Dies come in increments of 1mm so I cant be needing a M10x1.0. I’m stumped. What is wrong here anyone know?

Thanks

Presuming it’s a single start thread, with V profile
Might be of some help to attempt to get the minor diameter (in addition to the major diameter)
You’ve probably already looked at it , but the following provides links to the many different types of thread that are in use…

http://en.wikipedia.org/wiki/Screw_thread#Standardization

An additional thought! There’s two “hands” (direction the thread rotates around it’s axis) for every screw profile, and it’s perhaps possible that for some reason the spindle’s been cut with the less common hand. Means If the spindle thread is of opposing hand you’d need a nut/die that’s also got the corresponding hand. Have heard on certain parts, on certain bikes, the screw thread is cut so that normal use/rotation tends to tighten the part rather than loosen it. Means that for paired parts(such as pedals) the threads turn in different directions. Can’t understand why a spindle might have such a feature, but you never know.

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