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Originally Posted by Butcher
Check the link posted by pauldenton - BSP is defined by the OD of the thread, not the ID. For reference a 3/8" BSP should be 0.656" (16.6624mm) OD so your barb is indeed a 3/8" BSP. 16mm isn't even close to 1/2" though.
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The way I get it, 3/8" is 0.375" or 9.525mm, which indeed corresonds to the ID of the 3/8" thread. Hence I gathered that '3/8" BSP' refers to the ID, not the OD which, BTW, is indeed 16mm. (1/2" is 12.7mm, I know...)
@ quicksilverXP: determining the right size Phi-Ton clamps is easy. If you are using thick-walled Tygon (3mm wall thickness) then it is simply a matter of adding 6mm onto the barb diameter. If you're using other tubing, measure its OD.
Then, looking at the reference table
:at Phi-Ton here: you can see that the clamps have a max. hose OD and will constrict to a minimum ID diameter. What you want is clamps that accomodate at least your OD tubing or larger, but will be able to constrict to a ID smaller than your tubing (otherwise it won't clamp, obviously!).
So for 3/8" (9.525mm) barbs you are looking at clamps that can accomodate 15.525mm = 0.6112" OD tubing. The
1A-05 clamp accomodates up to 0.635" OD tubing but constricts down to 0.55". You could also use the 1A-06 but the 1A-05 provides a nicer, tighter fit.
For 1/2" (12.700mm) barbs you are looking for clamps that accomodate 18.700mm = 0.7362" OD tubing. The
1A-07 clamp accomodates up to 0.745" tubing but constricts down to 0.66".
One word of warning: those clamps are pretty but have a fairly large OD. If the barbs you want to use them on are spaced fairly close together on the block, you may get into trouble trying to fit them. Look at the table for the OD of the chosen clamp (Dim. C) and measure first whether your barbs are spaced sufficiently far apart.
Feel free to use my bracket idea. Sharing ideas is what modding forums are for!
