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+--- Thread: Drill bit/tap size for 3/8" bspt boost gauge tapping (/showthread.php?tid=29978)
Drill bit/tap size for 3/8" bspt boost gauge tapping - Paul_13 - 06-04-2015
It's been a very long time since I dealt with these kind of things (back in college 8years ago)
I've ordered a brass bspt adapter 3/8 tapping with 1/4" hose connection.
Now logic tells me to use a 9.5mm drill bit? Which is what size 3/8" is roughly. Do I just use the barb as a tap or do I need to use a proper tap?
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Iceman299 - 06-04-2015
I would use a 6.5-7mm drill bit and a proper tap to make the thread (making sure the pitch is the same)
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Dum-Dum - 06-04-2015
Google suggests somewhere around the 15mm mark?!?!?!?
https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1ASRM_enGB525GB525&ion=1&espv=2&ie=UTF-8#q=3%2F8+bspt+tap+drill+size
Personally I'd buy an M8 or M10 bleed nipple and drill for a standard metric thread (M8 can be done with a 6.5mm bit that most people have)
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - shervo - 06-04-2015
I used a 1/8 bsp taper tap with a 1/8 bsp taper nipple and used a 8.6mm drill. If thats any help.
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Paul_13 - 06-04-2015
(06-04-2015, 12:45 PM)Dum-Dum Wrote: Google suggests somewhere around the 15mm mark?!?!?!?
https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1ASRM_enGB525GB525&ion=1&espv=2&ie=UTF-8#q=3%2F8+bspt+tap+drill+size
Personally I'd buy an M8 or M10 bleed nipple and drill for a standard metric thread (M8 can be done with a 6.5mm bit that most people have)
I saw that as well and I really didn't think it was right, hence asking on here
I think I'll change my approach to this
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Poodle - 08-04-2015
Aren't bsp sizes stated at X-1/8th, X being the actual size? So 3/8bsp is actually 1/2"? I may be thinking of npt...
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - C2K - 09-04-2015
Be careful with BSPF, BSPP and BSPT. BSP is a pipe thread form and therefore the size can be misleading. It used to denote the pipe bore, but it doesn't really work nowadays. Taper tapping size is smaller than BSPF or BSPP tapping size.
3/8 BSPT tapping would be a bore of 9.525mm, but tapping drill for that size is 37/64 aka 14.75mm.
http://www.tradezone.co.nz/tapanddie/drillandtap/bspt-tap.htm
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Paul_13 - 09-04-2015
Should of realised it was inside bore.
Think I'll re order a m8 nipple
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Alan_M - 09-04-2015
Where's your Zeus book?
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Paul_13 - 09-04-2015
http://m.ebay.co.uk/itm/Barbed-Threaded-Fittings-6mm-x-M8-x-1-0-Barbed-Hose-Connector-Brass-JDY71-06-/321600317066
I've opted for this.
Lost you there Alan
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Alan_M - 09-04-2015
(09-04-2015, 08:49 PM)Paul_13 Wrote: http://m.ebay.co.uk/itm/Barbed-Threaded-Fittings-6mm-x-M8-x-1-0-Barbed-Hose-Connector-Brass-JDY71-06-/321600317066
I've opted for this.
Lost you there Alan
One of these....Will tell you drill sizes for tapping, amongst other stuff.
![[Image: zeus-book-500x500.jpg]](http://www.avontapdie.co.uk/image/cache/data/Products/zeus-book-500x500.jpg)
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - C2K - 09-04-2015
You can get it here, but iirc it's not got bspt in. Mine is at work.
http://www.green-oval.com/data/zeus.pdf
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Paul_13 - 09-04-2015
Nice, I'll get myself a copy of that
RE: Drill bit/tap size for 3/8" bspt boost gauge tapping - Paul_13 - 10-04-2015
http://m.ebay.co.uk/itm/Barbed-Threaded-Fittings-6mm-x-M8-x-1-0-Barbed-Hose-Connector-Brass-JDY71-06-/321600317066
What I've ordered now. Bit of ptfe/loctite will be all good