Difference between 9/16”x 20 Cycle Pitch and 9/16”x 20 UNS.

[Bill PhinnParticipant @billphinn90025]

Can anyone tell me what difference, in theory and practice, there is between these two thread types. I notice Tracy Tools list them both but at prices that don’t quite coincide.

I’m looking into the options for repairing bicycle crank arm threads, and no option looks exactly cheap at present.

[Michael GilliganParticipant @michaelgilligan61133]

I think it’s a subtlety of the thread-form, Bill

This might help:

https://en.wikipedia.org/wiki/British_Standard_Cycle

MichaelG.

.

Edit:__ if you thought the taps were expensive:

https://knowledge.bsigroup.com/products/specification-for-cycle-b-s-c-threads-formerly-known-as-c-e-i-threads?version=standard

[Michael GilliganParticipant @michaelgilligan61133]

Salvation:

https://ut.com.sg/ut/thread-2/truthread-gauging/bs-cycle-thread-gauges/

MichaelG.

[ sorry, need to get some sleep now ]

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