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Imperial and metric measurements

Discussion in 'Watercooling' started by sparkymark75, May 9, 2020.

  1. sparkymark75

    Mobster

    Joined: Jan 8, 2003

    Posts: 2,566

    Location: Scotland

    I have some 16mm/10mm soft tubing with appropriate Bykski fittings. I need to order some more black compression fittings but the only ones I can find that aren’t shipped from China are Barrow fittings which are 3/8 - 5/8 which I understand are comparable. Can these be used?
     
  2. Brizzles

    Soldato

    Joined: Mar 16, 2005

    Posts: 7,194

    Location: Clevedon , Bristol

    Personally i would never mix IMP with Metric, only a slight difference could cause a leak
     
  3. Disco_P

    Soldato

    Joined: Dec 30, 2013

    Posts: 5,310

    Location: GPS signal not found. (11)

    I use 3/8" 5/8" primochill tubing with 10/16mm EK compression fittings without an issue. You could probably lift my PC with a single fitting they are that tight. I'd try it out, maybe just order a single fitting to begin with.
     
  4. sparkymark75

    Mobster

    Joined: Jan 8, 2003

    Posts: 2,566

    Location: Scotland

    Even though the Bykski fittings I bought were listed as being for 16/10 soft tubing. When I check the packet, it states for 3/8” so some manufacturers must use imperial and metric interchangeably. I’ve ordered 4 from the store suggested by some on the auction site.
     
  5. ubersonic

    Capodecina

    Joined: May 26, 2009

    Posts: 20,927

    Yes, it used to be that all PC water cooling parts were advertised in inches but then EK started using mm, some other EU manufacturers followed suit, then European retailers started doing it too (some even removing the inches and just advertising mm).

    As a general guide:

    5/16 ID - 3/8 OD = 10/8mm
    3/8 ID - 1/2 OD = 13/10mm
    3/8 ID - 5/8 OD = 16/10mm
    7/16 ID - 5/8 OD = 16/11mm
    1/2 ID - 5/8 OD = 16/13mm
    1/2 ID - 3/4 OD = 19/13mm

    You don't have to worry about mixing inches and mm as most manufacturers list their hose sizes as an approximation anyway, I.E EK's 10mm is actually 9.5mm and their 11mm is actually 11.1mm, it's very rare that tubing/fittings in PC water cooling is precise to the whole number. As long as nothing is out by more than a whole mm you should never have an issue (unless you're using barb fittings without clamps, not really a warning needed in 2020 but figured I should mention it for completeness).
     
  6. sparkymark75

    Mobster

    Joined: Jan 8, 2003

    Posts: 2,566

    Location: Scotland

    Thanks. I’m using compression fittings so hopefully, other than my own ineptitude, I should be all good.
     
  7. Bossman

    Mobster

    Joined: Oct 18, 2002

    Posts: 4,403

    Location: Newton

    Don't forget that you'll be compressing the tube over the barb creating a seal. So any 0.1mm of a difference will probably be eliminated by the fact that the tube will be stretched and compressed anyway.
     
  8. LePhuronn

    Mobster

    Joined: Sep 26, 2010

    Posts: 4,861

    Location: Stoke-on-Trent

    For soft tube you won't have an issue mixing imperial and metric as long as you get the closest equivalents. A lot of soft tube has minor variance in their measurements anyway, so things squish around and fill the fractional millimetre differences.

    NEVER EVER EVER mix imperial and metric in hard tube though ;)