ASA thread size?

Rage 01 · 11-18-2012, 11:39 PM

Does anyone know what the thread size is for the asa? (where the tank screws in)

Can you use a tap? or are the threads cut with a lathe?
Got a project in mind.

Thankx.

lexiones · 11-18-2012, 11:44 PM

IIRC you can get by with a 1/2-NPS pipe tap. Though that is a little off from the standard.

ApoC_101 · 11-19-2012, 12:01 AM

ASA threads are called CGA 320 (the ASTM F1750 standard), if you tap it with 1/2-14 taps you will need to use a good bottoming tap to make sure the threads are deep enough. no guarantee the thread size and quality will be what you want though... ASA internal threads are usually thread turned or milled to get the size and finish good (but, you should be able to manage with taps if you use half decent taps and the sizes are right).

Rage 01 · 11-19-2012, 12:16 AM

So this will work? Or is that not a good tap?

1 2 14 NPS HSS Pipe Tap Union Butterfield 1542 1010584 | eBay

lexiones · 11-19-2012, 12:38 AM

As apoc said you would also need a bottoming tap or else the bottom of your threads will only be started.

redlaser666 · 11-19-2012, 01:53 AM

here is one

1 2 14 NPS 4 Flute HSS Bottom Tap 1 1 8 FL Made in Japan 1pc Used | eBay

Rage 01 · 11-19-2012, 01:40 PM

Quote:

Originally Posted by redlaser666

here is one

1 2 14 NPS 4 Flute HSS Bottom Tap 1 1 8 FL Made in Japan 1pc Used | eBay

Thank you..
Bought it. I was looking around and the cheapest one I could find was $45.00 with $20 shipping. This one was worth picking up to play with.

Thankx again.

ApoC_101 · 11-19-2012, 02:14 PM

remember to get the hole diameter right before the tap goes through... boring it is a must to make sure the hole size is straight and on size. measure the ID of another ASA and go from that

Spider! · 11-19-2012, 02:59 PM

Quote:

Originally Posted by ApoC_101

remember to get the hole diameter right before the tap goes through... boring it is a must to make sure the hole size is straight and on size. measure the ID of another ASA and go from that

That's going to be a tough tap anyway, isn't it? Those are some fat threads to bottom.

Fat bottom threads...you make the back bottle valve go 'round.

ApoC_101 · 11-19-2012, 03:10 PM

Quote:

Originally Posted by Spider!

Fat bottom threads...you make the back bottle valve go 'round.

Hah, nice

tough tap, not really no. I've snapped one inch taps before in very tough steels, that I would consider tough... half inch anything in aluminum is cake walking

11-18-2012, 11:39 PM	#1 (permalink)
Rage 01 MCB Member Join Date: Oct 2008 Location: Calgary - Canada	ASA thread size? Does anyone know what the thread size is for the asa? (where the tank screws in) Can you use a tap? or are the threads cut with a lathe? Got a project in mind. Thankx. __________________ M. Carter Brown FEEDBACK

11-19-2012, 12:01 AM	#3 (permalink)
ApoC_101 Avratech Industries Inc. Join Date: Aug 2007 Location: Vancouver, BC	ASA threads are called CGA 320 (the ASTM F1750 standard), if you tap it with 1/2-14 taps you will need to use a good bottoming tap to make sure the threads are deep enough. no guarantee the thread size and quality will be what you want though... ASA internal threads are usually thread turned or milled to get the size and finish good (but, you should be able to manage with taps if you use half decent taps and the sizes are right). __________________ Visit us at www.avratech.com for sexy custom markers.

11-19-2012, 12:16 AM	#4 (permalink)
Rage 01 MCB Member Join Date: Oct 2008 Location: Calgary - Canada	So this will work? Or is that not a good tap? 1 2 14 NPS HSS Pipe Tap Union Butterfield 1542 1010584 \| eBay __________________ M. Carter Brown FEEDBACK

11-19-2012, 01:53 AM	#6 (permalink)
redlaser666 US ARMY SIG CORPS Join Date: Dec 2010 Location: Spanaway, Washington	here is one 1 2 14 NPS 4 Flute HSS Bottom Tap 1 1 8 FL Made in Japan 1pc Used \| eBay __________________ My Feedback!

11-19-2012, 02:14 PM	#8 (permalink)
ApoC_101 Avratech Industries Inc. Join Date: Aug 2007 Location: Vancouver, BC	remember to get the hole diameter right before the tap goes through... boring it is a must to make sure the hole size is straight and on size. measure the ID of another ASA and go from that __________________ Visit us at www.avratech.com for sexy custom markers.

11-18-2012, 11:44 PM	#2 (permalink)
lexiones MCB Member Join Date: Jul 2006 Location: Lewistown, pa	IIRC you can get by with a 1/2-NPS pipe tap. Though that is a little off from the standard.

11-19-2012, 12:38 AM	#5 (permalink)
lexiones MCB Member Join Date: Jul 2006 Location: Lewistown, pa	As apoc said you would also need a bottoming tap or else the bottom of your threads will only be started.

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