Is a 15mm compression fitting thread 1/2 BSP ?

Discussion in 'Plumbers' Talk' started by dvddvd, Apr 9, 2021.

  1. dvddvd

    dvddvd Well-Known Member

    Still trying to find a way to get a 1/2 BSP female to 22mm compression? Just read that a 15mm x 22mm compression reducer could be used because the 15mm thread is 1/2 BSP. Could anybody comfirm it? Or I will have to order online Thanks
     
  2. dvddvd

    dvddvd Well-Known Member

    Hi thanks they only do 1/2" to 22mm in the female version not the 1/2" male to 22mm compression?
     
  3. Sorry I thought that was a 22mm x 1/2” male. You can get them, any plumbers merchant or other online stores. A reducer would work though
     
  4. dvddvd

    dvddvd Well-Known Member

  5. kiaora

    kiaora Guest

    Hi
    It’s off the shelf fitting, 1/2” male iron to 22mm compression,

    a compression 15mm to 22mm compression would also be ok, the 15mm is 1/2” male iron

    Good luck
    Peter
     
    Deleted member 246321 likes this.

  6. Both ways will be fine but I would just go with the reducer out of both options. Plenty of ptfe tape on the thread it will be fine.
     
  7. dvddvd

    dvddvd Well-Known Member

    Thanks seems the easiest option, so is there a little difference in 15mm compression fittings thread and 1/2"? If not why have both?
     
  8. I think it’s 8, 12, and 15mm that have bsp threads, 1/4”, 3/8” and 1/2”. They quite often don’t have as long a thread on them tho and also don’t have a flat face at the end so aren’t ideal for fitting on things like flexis where the seal is made with a washer.
     
  9. heatyman

    heatyman Well-Known Member

    Whilst most 15mm compression fittings are 1/2" bsp, (some earlier ones had finer threads) the same cannot be said for 10mm and 8mm. As an oil engineer I encounter many 10mm and 8mm fittings and am amazed at the difference both in thread pitch and also diameter. Some, mainly imported ones, are quite flimsy and will use a 12mm or 13mm spanner to tighten, whilst others such as Wade or Floflex need a 15mm or 16mm spanner.
     
    Deleted member 246321 likes this.
  10. True, but most common brands are bsp
     

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