JAP threads

Discussion in 'Discussion' started by lambe, Dec 25, 2020.

  1. lambe

    lambe Member

    I've just been looking to rebuild my first working toy, given to me as a child "others" dismantled it over 35 years ago so some bits are long gone. I assumed the fine threads were BSF but appear to be 26 TPI cycle thread, regardless of diameter. Any confirmation or other suggestions? I presume this must hark back to their early production of bike engines and parts
  2. lambe

    lambe Member

    Looking through my tooling toy box I find that 26 TPI is Model Engineer Thread, of which I have a full set of taps and dies. Making bolts and nuts just got much quicker!, mind I only have stainless bar stock.
  3. petternut

    petternut Administrator

    Malcolm, How very odd.
    Are you sure the threads aren't simply UNF?

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