Spiralok - female internal thread
Spiralok - female internal thread
(OP)
Hi,
I am new to the forum and have a question about Spiralok.
I was wondering if there was a standard way of showing, on drawings, which way a hole should be tapped to accept a Spiralok internal thread.
At the moment we have two different methods that has caused lots of confusion.
The first being a darwing note that states the thread should be tapped from the bottom (this is the most confusing)
The second is an additional sheet to the drawings that shows all of the views that the thread should be tapped from.
My question is, is there a standard way of showing this on drawings.
i hope this makes sense.
Thanks
Tom
I am new to the forum and have a question about Spiralok.
I was wondering if there was a standard way of showing, on drawings, which way a hole should be tapped to accept a Spiralok internal thread.
At the moment we have two different methods that has caused lots of confusion.
The first being a darwing note that states the thread should be tapped from the bottom (this is the most confusing)
The second is an additional sheet to the drawings that shows all of the views that the thread should be tapped from.
My question is, is there a standard way of showing this on drawings.
i hope this makes sense.
Thanks
Tom





RE: Spiralok - female internal thread
No, drill and tap the hole normally then use the Spiralok as per manufacturer specifications.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Spiralok - female internal thread
WADR, did you Google Spiralock? Spiralok is a typo, by the way. The Spiralock threadform is non-symmetric, uni-directional, or whatever you want to call it. That is, it is meant to hold in one direction. Granted, the OP isn't real clear. However, I think it sounds like he's needing to tap holes with a Spiralock threadform tap. If they are through holes, the tap must be started from the correct side.
Tom,
I think anyone who understands the Spiralock concept would understand why the holes have to be tapped from a certain side. You shouldn't try to have anyone fabricate your parts unless they understand this. Otherwise they'll just tap from whatever side they want to no matter what the drawing says.
RE: Spiralok - female internal thread
As far as I know this type of hole is always tapped from the screw-entry side, since this is the only side that blind holes can be tapped from, and they only appear to sell one type of tap. For a through hole it would be necessary to indicate which side to tap from.
I would simply call out the hole with a leader line and arrow stemming from the side to be tapped from (preferably in a side view) and add "TAP FROM THIS SIDE" to your thread note. But calling out the hole to be tapped on the "OTHER SIDE" should also be clear, since that is also a common marking for counterbores, etc.
Don
Kansas City
RE: Spiralok - female internal thread
Mike Halloran
Pembroke Pines, FL, USA
RE: Spiralok - female internal thread
Don
Kansas City
RE: Spiralok - female internal thread
sorry for my delay, iv been off sick!
Don your response seems the most understanding and accurate! What i cant seem to find if there is a standard way show which way the holes should be tapped from. In guess that it is just a simple note on the drawing coming off of each hole!
Cheers for all your help guys.
p.s. we have to have through holes im afraid.
RE: Spiralok - female internal thread
"Tap from opposite side" is an acceptable note, but usually my second choice, just because.
RE: Spiralok - female internal thread
Have you considered a hole schedule? Then you could call one side "A" and the other side "B" and put a column in your schedule that denotes which side to tap from for each hole, in addition to the thread-size and center coördinates.
Don
Kansas City